From dab1fd265d99d75dcf540e43015eb164a62898f1 Mon Sep 17 00:00:00 2001
From: Andreas Kling <andreas@ladybird.org>
Date: Sun, 6 Jul 2025 14:45:04 +0200
Subject: [PATCH] test-web: Dump stacking context tree in layout test output

This will allow us to test (and catch regressions in) stacking context
tree construction and updates, etc.
---
 Libraries/LibWeb/Painting/StackingContext.cpp |  7 ++--
 Libraries/LibWeb/Painting/StackingContext.h   |  2 +-
 Libraries/LibWebView/PageInfo.h               |  1 +
 Services/WebContent/ConnectionFromClient.cpp  | 42 ++++++++++++++++++-
 .../expected/Element-insertAdjacentHTML.txt   |  3 ++
 ...date-the-image-data-temporary-document.txt |  3 ++
 .../HTMLSelectElement-selected-index.txt      |  3 ++
 .../abspos-box-bottom-with-max-height.txt     |  3 ++
 .../abspos-box-with-block-level-sibling.txt   |  3 ++
 .../abspos-box-with-replaced-element.txt      |  3 ++
 ...abspos-flex-container-with-auto-height.txt |  3 ++
 .../expected/abspos-flex-margin-limits-1.txt  |  3 ++
 .../expected/abspos-flex-margin-limits-2.txt  |  3 ++
 .../abspos-flexbox-with-auto-height.txt       |  3 ++
 .../abspos-flexbox-with-auto-width.txt        |  3 ++
 ...bspos-image-with-min-height-constraint.txt |  3 ++
 ...on-bfc-root-with-min-height-constraint.txt |  3 ++
 ...os-not-replaced-multiple-auto-variants.txt |  3 ++
 ...tion-containing-block-inline-situation.txt |  3 ++
 .../abspos-with-percentage-insets.txt         |  3 ++
 ...bspos-with-static-position-in-one-axis.txt |  3 ++
 Tests/LibWeb/Layout/expected/acid1.txt        |  3 ++
 ...ly-ignore-the-negative-overflow-region.txt |  3 ++
 ...continue-to-inherit-style-after-change.txt |  3 ++
 .../expected/aspect-ratio-auto-and-ratio.txt  |  3 ++
 .../Layout/expected/aspect-ratio-auto.txt     |  3 ++
 .../aspect-ratio-degenerate-ratio.txt         |  3 ++
 .../Layout/expected/aspect-ratio-ratio.txt    |  3 ++
 .../auto-margin-max-width-container.txt       |  3 ++
 ...ed-abspos-element-must-not-be-negative.txt |  3 ++
 ...ed-abspos-element-must-not-be-negative.txt |  3 ++
 .../bfc-fit-content-width-with-margin.txt     |  3 ++
 Tests/LibWeb/Layout/expected/blank.txt        |  3 ++
 .../expected/block-and-inline/abspos-br.txt   |  3 ++
 .../abspos-grid-with-definite-width.txt       |  3 ++
 .../abspos-only-with-inset-left.txt           |  3 ++
 ...bspos-with-auto-margins-in-inline-axis.txt |  3 ++
 ...t-insets-relative-to-box-with-paddings.txt |  3 ++
 .../abspos-with-insets-and-auto-margins.txt   |  3 ++
 ...gainst-padding-box-of-containing-block.txt |  3 ++
 .../abspos-with-percentage-padding.txt        |  3 ++
 ...sets-relative-top-box-with-padding-top.txt |  3 ++
 .../abspos-without-insets.txt                 |  3 ++
 ...ct-ratio-but-width-and-height-are-auto.txt |  3 ++
 .../atomic-inline-with-aspect-ratio-2.txt     |  3 ++
 ...-inline-with-percentage-vertical-align.txt |  3 ++
 .../atomic-inline-with-white-space-nowrap.txt |  3 ++
 ...e-children-and-nonempty-floating-child.txt |  3 ++
 ...-consider-all-currently-stacked-floats.txt |  3 ++
 .../bfc-float-left-break-vertically-2.txt     |  3 ++
 .../bfc-float-left-break-vertically.txt       |  3 ++
 ...xpands-for-descendants-with-margin-top.txt |  3 ++
 .../block-and-inline/block-inside-inline.txt  |  3 ++
 ...lock-level-floating-box-with-clearance.txt |  3 ++
 ...ock-with-fit-content-width-constraints.txt |  3 ++
 .../block-with-fit-content-width.txt          |  3 ++
 ...n-overflow-after-float-and-margin-left.txt |  3 ++
 ...block-with-hidden-overflow-after-float.txt |  3 ++
 ...th-hidden-overflow-after-sibling-float.txt |  3 ++
 .../block-with-max-content-width.txt          |  3 ++
 .../block-with-min-content-width.txt          |  3 ++
 ...egative-margin-and-no-intruding-floats.txt |  3 ++
 .../box-with-clearance-and-margin-top.txt     |  3 ++
 ...percentage-height-wrapped-in-anonymous.txt |  3 ++
 .../button-baseline-align.txt                 |  3 ++
 .../block-and-inline/button-image-only.txt    |  3 ++
 ...should-have-vertically-aligned-content.txt |  3 ++
 .../block-and-inline/button-width.txt         |  3 ++
 .../button-with-abspos-pseudo-element.txt     |  3 ++
 .../button-with-after-pseudo.txt              |  4 ++
 .../button-with-before-pseudo.txt             |  4 ++
 ...tton-with-block-content-baseline-align.txt |  3 ++
 .../button-with-min-height.txt                |  3 ++
 ...on-with-multiple-words-text-node-label.txt |  3 ++
 ...ton-with-text-node-label-and-font-size.txt |  3 ++
 .../button-with-text-node-label.txt           |  3 ++
 ...ar-both-from-inline-formatting-context.txt |  3 ++
 ...ear-both-without-introducing-clearance.txt |  3 ++
 .../expected/block-and-inline/clearfix.txt    |  3 ++
 .../columns-33-percent-width.txt              |  3 ++
 ...tainer-should-avoid-overlapping-floats.txt |  3 ++
 .../expected/block-and-inline/float-1.txt     |  3 ++
 .../expected/block-and-inline/float-2.txt     |  3 ++
 .../expected/block-and-inline/float-3.txt     |  3 ++
 .../expected/block-and-inline/float-4.txt     |  3 ++
 ...at-clear-by-line-break-at-end-of-block.txt |  3 ++
 ...-clear-by-line-break-followed-by-block.txt |  3 ++
 ...clear-by-line-break-followed-by-inline.txt |  3 ++
 ...ar-right-should-not-affect-inline-left.txt |  3 ++
 .../float-clear-simultaneously.txt            |  3 ++
 .../block-and-inline/float-fits-exactly.txt   |  3 ++
 .../float-following-trailing-whitespace.txt   |  3 ++
 ...loat-initial-available-space-vs-height.txt |  3 ++
 .../float-inside-margin-auto-container.txt    |  3 ++
 .../float-intrusions-relative-coordinates.txt |  3 ++
 ...d-right-with-justified-text-in-between.txt |  3 ++
 ...at-left-and-right-with-text-in-between.txt |  3 ++
 .../block-and-inline/float-logical.txt        |  3 ++
 ...-content-containing-block-flex-display.txt |  3 ++
 .../float-max-content-containing-block.txt    |  3 ++
 .../float-nested-under-eachother.txt          |  3 ++
 .../float-should-avoid-inline-block.txt       |  3 ++
 .../block-and-inline/float-stress-1.txt       |  3 ++
 .../block-and-inline/float-stress-2.txt       |  3 ++
 .../block-and-inline/float-stress-3.txt       |  3 ++
 .../float-under-if-would-fit.txt              |  3 ++
 ...ertical-clearance-for-text-after-break.txt |  3 ++
 ...rtical-clearance-ignores-opposite-side.txt |  3 ++
 ...oat-vertical-offset-by-preceding-float.txt |  3 ++
 .../float-with-inline-contents-hoisted.txt    |  3 ++
 .../float-with-negative-margins.txt           |  3 ++
 ...loating-box-with-box-sizing-border-box.txt |  3 ++
 .../floats-and-negative-margins.txt           |  3 ++
 ...loats-with-negative-percentage-margins.txt |  3 ++
 ...ed-break-stops-non-whitespace-sequence.txt |  3 ++
 ...tainer-should-avoid-overlapping-floats.txt |  3 ++
 .../html-element-height-quirks-mode-off.txt   |  3 ++
 .../html-element-height-quirks-mode-on.txt    |  3 ++
 ...loat-left-and-sibling-with-margin-left.txt |  3 ++
 .../inline-block-baseline-1.txt               |  3 ++
 .../inline-block-baseline-2.txt               |  3 ++
 ...line-block-contained-by-abspos-element.txt |  3 ++
 ...ine-block-leading-and-trailing-metrics.txt |  3 ++
 .../inline-block-percentage-max-width.txt     |  3 ++
 .../inline-block-vertical-align-middle.txt    |  3 ++
 ...nline-block-with-max-width-fit-content.txt |  3 ++
 ...inline-block-with-negative-margin-left.txt |  3 ++
 ...nline-block-with-negative-margin-right.txt |  3 ++
 ...ht-and-auto-height-of-containing-block.txt |  3 ++
 .../inline-box-positioned-with-top-left.txt   |  3 ++
 ...th-vertical-margins-vertical-align-top.txt |  3 ++
 .../inline-box-with-vertical-margins.txt      |  3 ++
 .../block-and-inline/inline-float-clear.txt   |  3 ++
 ...e-node-not-inserted-into-generated-box.txt |  3 ++
 ...rinsic-sizing-with-min-width-specified.txt |  3 ++
 ...us-sibling-if-wrapped-in-anonymous-box.txt |  3 ++
 ...hat-starts-with-collapsible-whitespace.txt |  3 ++
 .../list-markers-intruded-by-float.txt        |  3 ++
 .../block-and-inline/margin-collapse-1.txt    |  3 ++
 .../block-and-inline/margin-collapse-2.txt    |  3 ++
 .../block-and-inline/margin-collapse-3.txt    |  3 ++
 .../block-and-inline/margin-collapse-4.txt    |  3 ++
 .../block-and-inline/margin-collapse-5.txt    |  3 ++
 .../block-and-inline/margin-collapse-6.txt    |  3 ++
 ...in-must-not-collapse-across-nested-bfc.txt |  3 ++
 .../margin-padding-block-inline-start.txt     |  3 ++
 .../margin-padding-block-inline.txt           |  3 ++
 ...max-width-for-box-with-inline-children.txt |  3 ++
 .../max-width-must-not-expand-element.txt     |  3 ++
 ...dth-on-block-level-box-that-creates-fc.txt |  4 ++
 ...ontributes-to-intrinsic-size-of-parent.txt |  3 ++
 .../max-width-percentage-100-border-box.txt   |  3 ++
 .../max-width-percentage-100.txt              |  3 ++
 .../max-width-percentage-containing-block.txt |  3 ++
 .../max-width-wrapped-in-max-content.txt      |  3 ++
 ...min-width-for-box-with-inline-children.txt |  3 ++
 ...bfc-width-to-avoid-overlap-with-floats.txt |  3 ++
 .../negative-margin-with-padding.txt          |  3 ++
 ...-flows-not-inserted-into-generated-box.txt |  3 ++
 ...bspos-box-with-percentage-height-child.txt |  3 ++
 ...-box-nested-into-percentage-height-box.txt |  3 ++
 .../percentage-height-in-quirks-mode.txt      |  3 ++
 ...n-height-with-containing-block-padding.txt |  3 ++
 .../percentage-min-height.txt                 |  3 ++
 ...ith-max-content-containing-block-width.txt |  3 ++
 ...-with-indefinite-containing-block-size.txt |  3 ++
 .../block-and-inline/relpos-block.txt         |  3 ++
 .../block-and-inline/relpos-float.txt         |  3 ++
 .../relpos-inline-element-js-offsets.txt      |  3 ++
 .../relpos-inline-elements.txt                |  3 ++
 .../single-br-inline-layout.txt               |  3 ++
 .../small-percentage-margin.txt               |  3 ++
 ...ns-set-zero-if-containing-size-smaller.txt |  3 ++
 Tests/LibWeb/Layout/expected/block-size.txt   |  3 ++
 ...y-layout-internal-box-without-crashing.txt |  3 ++
 ...-radius-invalid-corner-sampling-config.txt |  3 ++
 .../border-spacing-calc-dont-crash.txt        |  3 ++
 ...-box-for-definite-sizes-without-layout.txt |  3 ++
 .../br-should-not-generate-pseudo-before.txt  |  3 ++
 ...-with-before-and-after-pseudo-elements.txt |  3 ++
 .../calc-font-size-with-percentages.txt       |  3 ++
 .../Layout/expected/calc-negate-length.txt    |  3 ++
 .../expected/calc-negative-border-width.txt   |  3 ++
 Tests/LibWeb/Layout/expected/calc-with-fr.txt |  3 ++
 .../child-of-abspos-percentage-height.txt     |  3 ++
 .../html-with-only-a-template-tag.txt         |  3 ++
 .../LibWeb/Layout/expected/css-all-unset.txt  |  3 ++
 .../Layout/expected/css-appearance-none.txt   |  3 ++
 .../expected/css-attr-typed-fallback.txt      |  3 ++
 .../Layout/expected/css-calc-border-width.txt |  3 ++
 .../expected/css-content-visibility.txt       |  5 ++-
 .../Layout/expected/css-counters/basic.txt    |  3 ++
 .../counters-function-single-argument.txt     |  3 ++
 .../css-counters/counters-function.txt        |  3 ++
 .../expected/css-counters/hidden-elements.txt |  3 ++
 .../expected/css-degenerate-aspect-ratio.txt  |  3 ++
 .../Layout/expected/css-dir-selector.txt      |  3 ++
 Tests/LibWeb/Layout/expected/css-ex-unit.txt  |  3 ++
 .../Layout/expected/css-font-size-calc.txt    |  3 ++
 .../Layout/expected/css-font-size-math.txt    |  3 ++
 .../css-host-selector-gets-parsed.txt         |  3 ++
 .../Layout/expected/css-import-rule.txt       |  3 ++
 .../css-imported-sheet-with-media-rule.txt    |  3 ++
 .../css-invalid-psuedo-compound-selector.txt  |  3 ++
 ...css-line-height-percentage-inheritance.txt |  3 ++
 .../Layout/expected/css-line-height-zero.txt  |  3 ++
 .../expected/css-logical-inset-properties.txt |  3 ++
 .../expected/css-namespace-rule-matches.txt   |  3 ++
 .../expected/css-namespace-rule-no-match.txt  |  3 ++
 .../css-namespace-tag-name-selector.txt       |  3 ++
 .../css-namespace-universal-selector.txt      |  3 ++
 .../css-pseudo-element-blockification.txt     |  3 ++
 .../css-pseudo-element-display-list-item.txt  |  3 ++
 ...should-not-be-affected-by-inline-style.txt |  3 ++
 ...ot-be-affected-by-presentational-hints.txt |  3 ++
 .../Layout/expected/css-quotes-nesting.txt    |  3 ++
 .../css-rect-value-with-calc-dont-crash.txt   |  3 ++
 Tests/LibWeb/Layout/expected/css-revert.txt   |  3 ++
 ...s-round-function-with-percentage-value.txt |  3 ++
 .../css-snap-a-length-as-a-border-width.txt   |  3 ++
 .../css-table-cell-verticalalign-text-top.txt |  3 ++
 .../expected/css-text-transform-math-auto.txt |  3 ++
 .../Layout/expected/css-transition-none.txt   |  3 ++
 .../css-values/calc-min-with-percentage.txt   |  3 ++
 .../css-values/comparison-functions.txt       |  3 ++
 .../css-values/exponential-functions.txt      |  3 ++
 .../expected/css-values/numeric-constants.txt |  3 ++
 .../rect-non-token-contents-crash.txt         |  3 ++
 .../css-values/sign-related-functions.txt     |  3 ++
 .../css-values/stepped-value-functions.txt    |  3 ++
 .../css-values/trigonometric-functions.txt    | 10 +++++
 .../Layout/expected/css-var-in-calc-block.txt |  3 ++
 .../css/counters-on-pseudo-elements.txt       |  3 ++
 .../LibWeb/Layout/expected/details-closed.txt |  3 ++
 Tests/LibWeb/Layout/expected/details-open.txt |  3 ++
 .../details-summary-default-ua-style.txt      |  3 ++
 .../Layout/expected/dialog-open-modal.txt     |  5 +++
 .../Layout/expected/dialog-open-non-modal.txt |  3 ++
 .../display-contents-with-in-children.txt     |  3 ++
 .../expected/display-table-column-crash.txt   |  3 ++
 .../display-table-inline-children.txt         |  3 ++
 Tests/LibWeb/Layout/expected/div_align.txt    |  3 ++
 .../Layout/expected/div_align_nested.txt      |  3 ++
 .../document-write-incomplete-tag.txt         |  3 ++
 ...nt-crash-on-relayout-that-rewraps-text.txt |  3 ++
 .../expected/element-use-pseudo-element.txt   |  3 ++
 .../empty-image-should-be-zero-sized.txt      |  3 ++
 .../fieldset-with-rendered-legend.txt         |  3 ++
 ...-abspos-item-with-preceding-whitespace.txt |  3 ++
 Tests/LibWeb/Layout/expected/flex-auto.txt    |  3 ++
 .../expected/flex-column-constained-wrap.txt  |  3 ++
 .../flex-column-constrained-nowrap.txt        |  3 ++
 ...n-height-constrained-width-constrained.txt |  3 ++
 .../flex-column-height-constrained.txt        |  3 ++
 .../flex-column-height-unconstrained.txt      |  3 ++
 ...mn-item-with-auto-height-and-max-width.txt |  3 ++
 ...g-auto-width-with-max-width-constraint.txt |  3 ++
 ...th-auto-height-depending-on-auto-width.txt |  3 ++
 .../flex-container-constrained-nowrap.txt     |  3 ++
 .../flex-container-constrained-wrap.txt       |  3 ++
 ...-height-and-item-that-has-aspect-ratio.txt |  3 ++
 .../flex-container-width-constrained.txt      |  3 ++
 .../flex-frozen-items-should-be-respected.txt |  3 ++
 .../Layout/expected/flex-grow-0-column.txt    |  3 ++
 Tests/LibWeb/Layout/expected/flex-grow-1.txt  |  3 ++
 Tests/LibWeb/Layout/expected/flex-grow-2.txt  |  3 ++
 .../flex-item-auto-height-with-wrap.txt       |  3 ++
 ...tem-on-row-with-intrinsic-aspect-ratio.txt |  3 ++
 ...dding-relative-to-flex-container-width.txt |  3 ++
 ...lex-item-with-cyclic-percentage-height.txt |  3 ++
 .../flex-item-with-intrinsic-aspect-ratio.txt |  3 ++
 .../Layout/expected/flex-justify-end-gap.txt  |  3 ++
 .../flex-margin-auto-justify-content.txt      |  3 ++
 Tests/LibWeb/Layout/expected/flex-row.txt     |  3 ++
 .../LibWeb/Layout/expected/flex-shrink-1.txt  |  3 ++
 .../LibWeb/Layout/expected/flex-shrink-2.txt  |  3 ++
 .../LibWeb/Layout/expected/flex-shrink-3.txt  |  3 ++
 ...child-static-position-with-align-items.txt |  3 ++
 ...d-static-position-with-justify-content.txt |  3 ++
 ...osition-with-padding-on-flex-container.txt |  3 ++
 .../abspos-flex-child-with-auto-height.txt    |  3 ++
 ...spos-flex-child-with-percentage-height.txt |  3 ++
 .../expected/flex/align-center-margin.txt     |  3 ++
 .../expected/flex/align-items-normal.txt      |  3 ++
 .../flex/align-keywords-start-and-end.txt     |  3 ++
 .../expected/flex/align-self-end-crash.txt    |  3 ++
 ...x-container-with-max-content-main-size.txt |  3 ++
 ...-baseline-with-inline-flex-empty-child.txt |  3 ++
 ...ment-does-not-get-blockified-by-itself.txt |  3 ++
 .../Layout/expected/flex/calc-flex-basis.txt  |  3 ++
 ...in-size-with-cross-max-size-constraint.txt |  3 ++
 .../flex/columns-33-percent-width.txt         |  3 ++
 ...-sizing-border-box-and-nonzero-padding.txt |  3 ++
 .../flex-basis-intrinsic-sizing-keywords.txt  |  3 ++
 ...n-container-with-max-width-max-content.txt |  3 ++
 ...-aspect-ratio-and-percentage-max-width.txt |  3 ++
 ...-aspect-ratio-and-automatic-cross-size.txt |  3 ++
 ...-column-item-with-percentage-max-width.txt |  3 ++
 .../flex-column-reverse-constrained-wrap.txt  |  3 ++
 .../flex/flex-constrained-wrap-reverse.txt    |  3 ++
 ...-cross-size-with-max-content-main-size.txt |  3 ++
 ...width-and-negative-margin-in-same-axis.txt |  3 ++
 .../flex/flex-gap-between-items-and-lines.txt |  3 ++
 .../flex/flex-item-min-width-fit-content.txt  |  3 ++
 .../flex-item-on-row-with-intrinsic-size.txt  |  3 ++
 ...ge-main-size-during-min-content-sizing.txt |  3 ++
 ...layout-dependent-containing-block-size.txt |  3 ++
 ...-intrinsic-aspect-ratio-and-max-height.txt |  3 ++
 .../expected/flex/flex-optimization-cases.txt |  3 ++
 .../flex-row-reverse-constrained-wrap.txt     |  3 ++
 ...flex-row-reverse-with-centered-content.txt |  3 ++
 ...flex-shorthand-flex-basis-zero-percent.txt |  3 ++
 .../inf-available-space-with-auto-margins.txt |  3 ++
 .../flex/inline-flex-baseline-of-child.txt    |  3 ++
 ...-early-resolution-of-percentage-height.txt |  3 ++
 ...ith-main-axis-margin-on-flex-container.txt |  3 ++
 ...contribution-with-main-size-constraint.txt |  3 ++
 ...mn-items-with-different-kinds-of-width.txt |  3 ++
 ...tem-that-only-has-natural-aspect-ratio.txt |  3 ++
 .../expected/flex/justify-content-1.txt       |  3 ++
 ...ustify-content-on-min-content-with-gap.txt |  3 ++
 ...tify-content-space-between-single-item.txt |  3 ++
 ...justify-content-with-margin-auto-child.txt |  3 ++
 .../flex/list-container-display-contents.txt  |  3 ++
 ...column-container-with-automatic-height.txt |  3 ++
 ...an-resolve-aspect-ratio-through-height.txt |  3 ++
 ...is-with-indefinite-flex-container-size.txt |  3 ++
 ...-basis-with-indefinite-reference-value.txt |  3 ++
 ...ith-indefinite-containing-block-height.txt |  3 ++
 .../Layout/expected/flex/relpos-flex-item.txt |  3 ++
 ...ut-with-space-between-and-space-around.txt |  3 ++
 .../reverse-with-justify-content-normal.txt   |  3 ++
 ...-with-negative-remaining-space-on-line.txt |  3 ++
 ...-suggestion-with-box-sizing-border-box.txt |  3 ++
 .../flex/stretch-alignment-with-cross-gap.txt |  3 ++
 ...tem-that-only-has-natural-aspect-ratio.txt |  3 ++
 ...svg-flex-item-with-percentage-max-size.txt |  3 ++
 ...ntage-padding-against-indefinite-width.txt |  3 ++
 ...ntage-padding-against-indefinite-width.txt |  3 ++
 .../expected/font-family-monospace-quirk.txt  |  3 ++
 .../Layout/expected/font-fractional-size.txt  |  3 ++
 .../Layout/expected/font-size-legacy.txt      |  3 ++
 .../LibWeb/Layout/expected/font-size-zero.txt |  3 ++
 .../expected/font-with-many-normal-values.txt |  3 ++
 ...etComputedStyle-on-unconnected-element.txt |  3 ++
 .../Layout/expected/grid/1fr-1000px.txt       |  3 ++
 .../grid/abspos-item-aligned-center.txt       |  3 ++
 ...-item-with-grid-area-aligned-in-center.txt |  3 ++
 ...m-with-grid-area-and-percentage-size-2.txt |  3 ++
 ...tem-with-grid-area-and-percentage-size.txt |  3 ++
 .../grid/abspos-item-with-grid-area.txt       |  3 ++
 .../grid/abspos-item-with-padding.txt         |  3 ++
 .../abspos-item-with-percentage-padding.txt   |  3 ++
 .../Layout/expected/grid/abspos-item.txt      |  3 ++
 ...s-placed-into-augmented-row-and-column.txt |  3 ++
 ...th-auto-column-placed-in-augmented-row.txt |  3 ++
 ...-auto-row-and-column-contained-by-grid.txt |  3 ++
 ...th-auto-row-placed-in-augmented-column.txt |  3 ++
 .../abspos-with-grid-container-as-parent.txt  |  3 ++
 .../Layout/expected/grid/align-content.txt    |  3 ++
 .../Layout/expected/grid/align-items.txt      |  3 ++
 .../Layout/expected/grid/align-self.txt       |  3 ++
 .../expected/grid/all-implicit-rows.txt       |  3 ++
 .../expected/grid/anonymous-inline-child.txt  |  3 ++
 .../auto-fill-and-named-line-placement.txt    |  3 ++
 .../Layout/expected/grid/auto-fill-rows.txt   |  3 ++
 .../LibWeb/Layout/expected/grid/auto-fill.txt |  3 ++
 .../grid/auto-fit-collapse-empty-tracks.txt   |  3 ++
 .../grid/auto-fit-empty-container.txt         |  3 ++
 ...when-min-and-max-are-both-not-definite.txt |  3 ++
 .../LibWeb/Layout/expected/grid/auto-fit.txt  |  3 ++
 .../grid/auto-flow-column-spanning-item.txt   |  3 ++
 .../Layout/expected/grid/auto-flow-column.txt |  3 ++
 .../Layout/expected/grid/auto-track-sizes.txt |  3 ++
 Tests/LibWeb/Layout/expected/grid/basic-2.txt |  3 ++
 Tests/LibWeb/Layout/expected/grid/basic.txt   |  3 ++
 Tests/LibWeb/Layout/expected/grid/borders.txt |  3 ++
 .../Layout/expected/grid/calc-track-size.txt  |  3 ++
 ...minimum-size-by-limited-max-track-size.txt |  3 ++
 .../Layout/expected/grid/column-1fr-1fr.txt   |  3 ++
 .../Layout/expected/grid/column-auto-auto.txt |  3 ++
 .../grid/columns-auto-fill-with-gap-2.txt     |  3 ++
 .../grid/columns-auto-fill-with-gap-3.txt     |  3 ++
 .../grid/columns-auto-fill-with-gap.txt       |  3 ++
 .../grid/container-max-width-max-content.txt  |  3 ++
 .../expected/grid/container-min-height.txt    |  3 ++
 .../grid/css-calc-in-grid-position.txt        |  3 ++
 .../grid/define-area-using-line-names.txt     |  3 ++
 .../expected/grid/different-column-sizes.txt  |  3 ++
 ...bute-extra-space-across-spanned-tracks.txt |  3 ++
 .../Layout/expected/grid/fit-content-1.txt    |  3 ++
 .../Layout/expected/grid/fit-content-2.txt    |  3 ++
 .../Layout/expected/grid/fit-content-3.txt    |  3 ++
 ...ed-tracks-followed-by-repeat-auto-fill.txt |  3 ++
 .../grid/float-container-columns-1fr-1fr.txt  |  3 ++
 .../Layout/expected/grid/floating-item.txt    |  3 ++
 .../grid/floating-table-wrapper-width.txt     |  3 ++
 .../grid/grid-area-non-token-parts-crash.txt  |  3 ++
 .../grid-column-non-token-parts-crash.txt     |  3 ++
 .../grid-container-min-height-border-box.txt  |  3 ++
 .../Layout/expected/grid/grid-gap-1.txt       |  3 ++
 .../Layout/expected/grid/grid-gap-2.txt       |  3 ++
 .../Layout/expected/grid/grid-gap-3.txt       |  3 ++
 .../grid/grid-item-fixed-paddings.txt         |  3 ++
 .../expected/grid/grid-item-fixed-size.txt    |  3 ++
 .../grid-item-horizontal-margins-auto.txt     |  3 ++
 .../expected/grid/grid-item-min-size.txt      |  3 ++
 .../grid/grid-item-percentage-margins.txt     |  3 ++
 .../grid/grid-item-percentage-width-2.txt     |  3 ++
 .../grid/grid-item-percentage-width.txt       |  3 ++
 ...ertical-padding-and-margin-percentages.txt |  3 ++
 .../grid/grid-item-with-fit-content-width.txt |  3 ++
 ...lacement-shorthand-single-custom-ident.txt |  3 ++
 ...id-row-height-affected-by-item-margins.txt |  3 ++
 .../expected/grid/grid-row-overflow-crash.txt |  3 ++
 .../grid-row-start-non-token-parts-crash.txt  |  3 ++
 .../expected/grid/grid-shorthand-property.txt |  3 ++
 .../Layout/expected/grid/grid-span-4.txt      |  3 ++
 .../grid/grid-template-areas-basics.txt       |  3 ++
 ...template-columns-with-min-css-function.txt |  3 ++
 .../Layout/expected/grid/grid-template.txt    |  3 ++
 .../grid/grid-with-min-content-max-width.txt  |  3 ++
 .../expected/grid/grow-beyond-limits.txt      |  3 ++
 .../Layout/expected/grid/image-in-grid.txt    |  3 ++
 ...-with-percentage-width-and-auto-height.txt |  3 ++
 .../img-with-percentage-width-and-height.txt  |  3 ++
 .../Layout/expected/grid/implicit-lines.txt   |  3 ++
 .../expected/grid/inline-abspos-item.txt      |  3 ++
 .../expected/grid/inline-grid-simple.txt      |  3 ++
 .../expected/grid/intrinsic-sized-column.txt  |  3 ++
 .../expected/grid/intrinsic-sized-grid-2.txt  |  3 ++
 .../expected/grid/intrinsic-sized-grid.txt    |  3 ++
 ...trinsic-sizing-should-account-for-gaps.txt |  3 ++
 .../item-align-self-center-and-max-height.txt |  3 ++
 .../item-align-self-center-and-min-height.txt |  3 ++
 .../expected/grid/item-column-span-2.txt      |  3 ++
 .../expected/grid/item-fit-content-width.txt  |  3 ++
 .../Layout/expected/grid/item-max-width.txt   |  3 ++
 .../Layout/expected/grid/item-min-width.txt   |  3 ++
 .../grid/item-span-exceeds-columns-size.txt   |  3 ++
 .../grid/item-with-box-sizing-border-box.txt  |  3 ++
 .../grid/item-with-min-content-width.txt      |  3 ++
 ...em-with-min-width-and-place-self-start.txt |  3 ++
 .../grid/item-with-percentage-max-width.txt   |  3 ++
 ...n-content-size-should-account-paddings.txt |  3 ++
 .../expected/grid/justify-content-cols.txt    |  3 ++
 .../expected/grid/justify-content-fr.txt      |  3 ++
 .../Layout/expected/grid/justify-content.txt  |  3 ++
 .../Layout/expected/grid/justify-items.txt    |  3 ++
 .../Layout/expected/grid/justify-self.txt     |  3 ++
 .../expected/grid/justify-start-min-width.txt |  3 ++
 ...acement-named-lines-with-span-negative.txt |  3 ++
 ...-based-placement-named-lines-with-span.txt |  3 ++
 .../expected/grid/line-based-with-repeat.txt  |  3 ++
 .../grid/line-placement-with-repeat.txt       |  3 ++
 .../expected/grid/max-height-fit-content.txt  |  3 ++
 ...-grid-container-wrapper-in-max-content.txt |  3 ++
 .../expected/grid/min-height-from-text.txt    |  3 ++
 .../Layout/expected/grid/min-max-content.txt  |  3 ++
 .../LibWeb/Layout/expected/grid/minmax-1.txt  |  3 ++
 .../LibWeb/Layout/expected/grid/minmax-2.txt  |  3 ++
 .../LibWeb/Layout/expected/grid/minmax-3.txt  |  3 ++
 .../grid/minmax-auto-track-definition.txt     |  3 ++
 .../Layout/expected/grid/minmax-invalid-1.txt |  3 ++
 .../grid/minmax-non-token-contents-crash.txt  |  3 ++
 .../grid/minmax-with-max-function-inside.txt  |  3 ++
 .../grid/minmax-with-percentage-max.txt       |  3 ++
 .../grid/negative-grid-item-column-index.txt  |  3 ++
 Tests/LibWeb/Layout/expected/grid/order.txt   |  3 ++
 .../grid/place-items-center-nested-grids.txt  |  3 ++
 .../expected/grid/place-items-center.txt      |  3 ++
 .../Layout/expected/grid/place-self.txt       |  3 ++
 .../Layout/expected/grid/placement-1.txt      |  3 ++
 .../Layout/expected/grid/placement-10.txt     |  3 ++
 .../Layout/expected/grid/placement-2.txt      |  3 ++
 .../Layout/expected/grid/placement-3.txt      |  3 ++
 .../Layout/expected/grid/placement-4.txt      |  3 ++
 .../Layout/expected/grid/placement-5.txt      |  3 ++
 .../Layout/expected/grid/placement-6.txt      |  3 ++
 .../Layout/expected/grid/placement-7.txt      |  3 ++
 .../Layout/expected/grid/placement-8.txt      |  3 ++
 .../Layout/expected/grid/placement-9.txt      |  3 ++
 .../expected/grid/placement-auto-negative.txt |  3 ++
 .../grid/placement-using-named-tracks-1.txt   |  3 ++
 .../grid/placement-using-named-tracks-2.txt   |  3 ++
 .../grid/placement-using-named-tracks-3.txt   |  3 ++
 ...ition-grid-item-with-percentage-insets.txt |  3 ++
 .../Layout/expected/grid/relpos-grid-item.txt |  3 ++
 .../repeat-auto-fit-fill-cannot-have-auto.txt |  3 ++
 .../grid/repeat-non-token-contents-crash.txt  |  3 ++
 Tests/LibWeb/Layout/expected/grid/repeat.txt  |  3 ++
 .../Layout/expected/grid/replaced-item-1.txt  |  3 ++
 .../Layout/expected/grid/replaced-item-2.txt  |  3 ++
 ...rt-fr-algorithm-if-less-than-base-size.txt |  3 ++
 Tests/LibWeb/Layout/expected/grid/row-1fr.txt |  3 ++
 .../row-gaps-with-overflowing-spans-crash.txt |  3 ++
 .../Layout/expected/grid/row-height.txt       |  3 ++
 .../expected/grid/row-span-2-maxcontent.txt   |  3 ++
 .../expected/grid/row-span-2-mincontent.txt   |  3 ++
 .../expected/grid/row-span-2-with-gaps.txt    |  3 ++
 .../Layout/expected/grid/row-span-2.txt       |  3 ++
 .../Layout/expected/grid/rows-1fr-1fr.txt     |  3 ++
 ...nfinite-spinning-in-space-distribution.txt |  3 ++
 .../should-not-hang-in-size-distribution.txt  |  3 ++
 .../expected/grid/stretch-auto-tracks.txt     |  3 ++
 .../Layout/expected/grid/template-areas-1.txt |  3 ++
 .../Layout/expected/grid/template-areas-2.txt |  3 ++
 .../Layout/expected/grid/template-areas-3.txt |  3 ++
 .../grid/template-lines-and-areas.txt         |  3 ++
 .../grid/track-size-calc-with-percentage.txt  |  3 ++
 .../grid/two-items-spanning-one-1fr-row.txt   |  3 ++
 .../grid/unresolvable-percentage-track.txt    |  3 ++
 .../expected/grid/valid-grid-areas-1.txt      |  3 ++
 .../expected/grid/vertical-margins-auto.txt   |  3 ++
 .../expected/height-min-max-fit-content.txt   |  3 ++
 ...-of-absolute-position-box-with-padding.txt |  3 ++
 .../Layout/expected/hidden-root-element.txt   |  2 +
 .../expected/hide-audio-based-on-controls.txt |  3 ++
 .../expected/host-pseudo-class-basic.txt      |  3 ++
 .../Layout/expected/html-dimensions.txt       |  3 ++
 .../Layout/expected/html-display-contents.txt |  3 ++
 .../Layout/expected/html-display-inline.txt   |  3 ++
 .../html-encoding-detection-crash.txt         |  3 ++
 .../image-display-block-margin-auto.txt       |  3 ++
 ...ge-with-multiple-constraint-violations.txt |  3 ++
 ...with-box-sizing-border-box-and-padding.txt |  3 ++
 ...-and-indefinite-containing-block-width.txt |  3 ++
 ...and-min-content-containing-block-width.txt |  3 ++
 .../expected/import-after-namespace.txt       |  3 ++
 .../import-from-linked-style-sheet.txt        |  3 ++
 ...put-no-newline-at-eof-should-not-crash.txt |  3 ++
 ...nline-block-treat-100pct-width-as-auto.txt |  3 ++
 .../inline-flex-with-aspect-ratio.txt         |  3 ++
 .../inline-fragment-ordering-flakiness.txt    |  3 ++
 Tests/LibWeb/Layout/expected/inline-size.txt  |  3 ++
 .../expected/input-as-button-align-center.txt |  3 ++
 .../input-as-button-shrink-to-fit.txt         |  3 ++
 .../input-element-with-display-inline.txt     |  3 ++
 Tests/LibWeb/Layout/expected/input-file.txt   |  3 ++
 .../Layout/expected/input-image-to-text.txt   |  3 ++
 Tests/LibWeb/Layout/expected/input-image.txt  |  3 ++
 .../expected/input-password-to-text.txt       |  3 ++
 .../input-placeholder-with-line-height.txt    |  3 ++
 .../Layout/expected/input-placeholder.txt     |  3 ++
 Tests/LibWeb/Layout/expected/input-range.txt  |  5 +++
 ...text-node-invalidation-on-value-change.txt |  3 ++
 .../Layout/expected/input-text-to-image.txt   |  3 ++
 .../expected/input-text-to-password.txt       |  3 ++
 .../expected/inset-shorthand-property.txt     |  3 ++
 .../inside-list-item-content-offset.txt       |  3 ++
 .../expected/justify-content-flex-start.txt   |  3 ++
 .../dialog-backdrop-update.txt                |  5 +++
 .../inline-element-position-change.txt        |  3 ++
 .../simple-update-inside-svg-subtree.txt      |  3 ++
 .../letter-spacing-end-of-line-001.txt        |  3 ++
 Tests/LibWeb/Layout/expected/lh-1.txt         |  3 ++
 Tests/LibWeb/Layout/expected/lh-2.txt         |  3 ++
 .../expected/line-height-calc-number.txt      |  3 ++
 Tests/LibWeb/Layout/expected/link-sheet.txt   |  3 ++
 .../list-item-marker-pseudo-placement.txt     |  3 ++
 .../list-render-list-owner-is-document.txt    |  3 ++
 .../list-render-list-owner-not-ol.txt         |  3 ++
 .../Layout/expected/list-render-no-list.txt   |  3 ++
 .../Layout/expected/media-query-empty.txt     |  3 ++
 .../expected/media-query-resolution.txt       |  3 ++
 .../Layout/expected/misc/corner-radius.txt    |  3 ++
 .../misc/create-iframes-using-innerhtml.txt   |  3 ++
 ...late-block-components-whitespace-crash.txt |  3 ++
 .../misc/percentage-stroke-width-crash.txt    |  3 ++
 .../Layout/expected/misc/set-display-null.txt |  3 ++
 .../expected/multi-code-point-graphemes.txt   |  3 ++
 .../Layout/expected/negative-max-size.txt     |  3 ++
 .../expected/non-existing-font-family.txt     |  3 ++
 ...ntage-padding-against-indefinite-width.txt |  3 ++
 .../nowrap-and-no-line-break-opportunity.txt  |  3 ++
 .../Layout/expected/object-fallback.txt       |  3 ++
 .../ol-render-deep-hybrid-list-item-list.txt  |  3 ++
 .../Layout/expected/ol-render-item-values.txt |  3 ++
 .../expected/ol-render-style-list-item.txt    |  3 ++
 Tests/LibWeb/Layout/expected/ordered-list.txt |  3 ++
 .../Layout/expected/overflow-with-padding.txt |  3 ++
 .../overflow-x-hidden-with-border-radius.txt  |  3 ++
 .../Layout/expected/percentage-font-size.txt  |  3 ++
 ...containing-block-has-indefinite-height.txt |  3 ++
 .../expected/picture-source-media-query.txt   |  3 ++
 .../place-content-shorthand-property.txt      |  3 ++
 .../Layout/expected/popovertarget-button.txt  |  5 +++
 .../expected/position-absolute-from-edges.txt |  3 ++
 ...g-of-position-relative-floating-parent.txt |  3 ++
 .../expected/position-absolute-top-left.txt   |  3 ++
 .../position-empty-pseudo-elements.txt        |  3 ++
 Tests/LibWeb/Layout/expected/pre.txt          |  3 ++
 ...seudo-element-with-custom-properties-2.txt |  3 ++
 .../pseudo-element-with-custom-properties.txt |  3 ++
 .../replaced-box-with-vertical-margins.txt    |  3 ++
 .../expected/replaced-within-max-content.txt  |  3 ++
 ...ero-when-available-size-is-min-content.txt |  3 ++
 .../resolve-height-of-containing-block.txt    |  3 ++
 .../expected/select-with-option-selected.txt  |  3 ++
 .../expected/set-margin-of-floating-box.txt   |  3 ++
 ...w-tree-removed-from-dom-receives-event.txt |  3 ++
 .../space-is-soft-line-break-opportunity.txt  |  3 ++
 .../Layout/expected/span-with-padding.txt     |  3 ++
 .../Layout/expected/srcset-sizes-crash.txt    |  3 ++
 ...e-invalidation-line-height-propagation.txt |  3 ++
 .../expected/svg-preserve-aspect-ratio.txt    |  3 ++
 .../svg-text-with-percentage-values.txt       |  3 ++
 .../Layout/expected/svg-text-with-viewbox.txt |  3 ++
 .../expected/svg-transforms-and-viewboxes.txt |  3 ++
 .../expected/svg/abspos-svg-polygon.txt       |  3 ++
 ...with-indefinite-containing-block-width.txt |  3 ++
 ...ith-zero-intrinsic-size-and-no-viewbox.txt |  3 ++
 .../svg/natural-width-from-svg-attributes.txt |  3 ++
 .../Layout/expected/svg/nested-viewports.txt  |  3 ++
 .../expected/svg/objectBoundingBox-mask.txt   |  3 ++
 .../Layout/expected/svg/standalone-h.txt      |  1 +
 .../Layout/expected/svg/standalone-vb-h.txt   |  1 +
 .../Layout/expected/svg/standalone-vb-w.txt   |  1 +
 .../Layout/expected/svg/standalone-vb-wh.txt  |  1 +
 .../Layout/expected/svg/standalone-vb.txt     |  1 +
 .../Layout/expected/svg/standalone-w.txt      |  1 +
 .../Layout/expected/svg/standalone-wh.txt     |  1 +
 .../LibWeb/Layout/expected/svg/standalone.txt |  2 +
 .../svg/svg-as-image-implicit-viewbox.txt     |  3 ++
 .../expected/svg/svg-as-image-invalid.txt     |  3 ++
 .../Layout/expected/svg/svg-as-image.txt      |  3 ++
 .../svg/svg-circle-percentage-attr.txt        |  3 ++
 .../svg/svg-different-types-of-opacity.txt    |  3 ++
 .../expected/svg/svg-fill-with-bogus-url.txt  |  3 ++
 .../svg-foreign-object-with-block-element.txt |  3 ++
 .../Layout/expected/svg/svg-g-inside-g.txt    |  3 ++
 .../expected/svg/svg-g-with-opacity.txt       |  3 ++
 .../expected/svg/svg-inside-inline-block.txt  |  3 ++
 .../expected/svg/svg-inside-svg-with-xy.txt   |  3 ++
 .../Layout/expected/svg/svg-inside-svg.txt    |  3 ++
 .../svg-intrinsic-size-in-one-dimension.txt   |  3 ++
 .../svg/svg-line-with-percentage-values.txt   |  3 ++
 .../svg-negative-elliptical-arg-number.txt    |  3 ++
 .../svg/svg-path-with-implicit-lineto.txt     |  3 ++
 .../expected/svg/svg-symbol-with-viewbox.txt  |  3 ++
 .../svg/svg-use-element-crashtest.txt         |  3 ++
 .../expected/svg/svg-viewbox-zero-width.txt   |  3 ++
 ...with-css-variable-in-presentation-hint.txt |  3 ++
 .../expected/svg/svg-with-display-block.txt   |  3 ++
 ...ith-zero-intrinsic-size-and-no-viewbox.txt |  2 +
 .../svg/svg-with-zero-sized-viewBox.txt       |  3 ++
 .../Layout/expected/svg/text-fill-none.txt    |  3 ++
 .../expected/svg/use-honor-outer-viewBox.txt  |  3 ++
 ...tab-size-chars-should-vertically-align.txt |  3 ++
 .../expected/tab-size-letter-spacing.txt      |  3 ++
 .../Layout/expected/tab-size-spacing-001.txt  |  4 ++
 .../Layout/expected/tab-size-text-wrap.txt    |  3 ++
 .../Layout/expected/tab-size-word-spacing.txt |  3 ++
 .../expected/table-fixup-with-rowspan.txt     |  3 ++
 .../table/absolute-positioning-alignment.txt  |  3 ++
 .../abspos-pseudo-element-inside-table.txt    |  3 ++
 .../Layout/expected/table/acid2-reduction.txt |  3 ++
 .../expected/table/align-top-and-bottom.txt   |  3 ++
 .../Layout/expected/table/auto-height.txt     |  3 ++
 .../Layout/expected/table/auto-margins.txt    |  3 ++
 .../avoid-div-by-zero-in-table-measures.txt   |  3 ++
 Tests/LibWeb/Layout/expected/table/basic.txt  |  3 ++
 .../border-attribute-overridden-by-css.txt    |  3 ++
 .../expected/table/border-attribute.txt       |  3 ++
 .../table/border-collapse-is-inherited.txt    |  3 ++
 .../border-conflict-resolution-with-cell.txt  |  3 ++
 .../border-conflict-resolution-with-col.txt   |  3 ++
 .../border-conflict-resolution-with-row.txt   |  3 ++
 ...rder-conflict-resolution-with-rowgroup.txt |  3 ++
 ...-resolutions-with-more-cells-than-cols.txt |  3 ++
 ...border-spacing-and-borders-table-width.txt |  3 ++
 .../expected/table/border-spacing-colspan.txt |  3 ++
 .../expected/table/border-spacing-rowspan.txt |  3 ++
 .../border-spacing-with-percentage-width.txt  |  3 ++
 .../Layout/expected/table/border-spacing.txt  |  3 ++
 .../LibWeb/Layout/expected/table/borders.txt  |  3 ++
 .../Layout/expected/table/bottom-caption.txt  |  3 ++
 ...-auto-max-width-table-percentage-width.txt |  3 ++
 .../Layout/expected/table/cell-px-height.txt  |  3 ++
 ...cell-relative-to-specified-table-width.txt |  3 ++
 .../expected/table/cell-with-max-width.txt    |  3 ++
 .../table/clip-spans-to-table-end.txt         |  3 ++
 .../Layout/expected/table/col-span-crash.txt  |  3 ++
 .../expected/table/colgroup-with-two-cols.txt |  3 ++
 .../expected/table/colspan-overflow-crash.txt |  3 ++
 .../table/colspan-percentage-width.txt        |  3 ++
 .../colspan-weighted-width-distribution.txt   |  3 ++
 .../table/colspan-width-distribution.txt      |  3 ++
 .../colspan-with-trailing-characters.txt      |  3 ++
 .../table/columns-width-distribution-1.txt    |  3 ++
 .../expected/table/display-table-size.txt     |  3 ++
 ...ed-layout-percentage-width-all-columns.txt |  3 ++
 .../table/fixed-layout-percentage-width.txt   |  3 ++
 .../fixed-layout-pixel-width-all-columns.txt  |  3 ++
 .../table/fixed-layout-pixel-width.txt        |  3 ++
 .../Layout/expected/table/fixed-layout.txt    |  3 ++
 .../Layout/expected/table/fixed-margins.txt   |  3 ++
 .../table/in-auto-height-flex-item.txt        |  3 ++
 .../expected/table/infinite-padding.txt       |  3 ++
 .../expected/table/inline-table-width.txt     |  3 ++
 .../expected/table/internal-alignment.txt     |  3 ++
 ...eyword-value-does-not-constrain-column.txt |  3 ++
 .../expected/table/line-breaking-in-cells.txt |  3 ++
 .../table/long-caption-increases-width.txt    |  3 ++
 .../table/missing-cells-with-span.txt         |  3 ++
 .../Layout/expected/table/missing-cells.txt   |  3 ++
 .../Layout/expected/table/multi-line-cell.txt |  3 ++
 .../expected/table/nested-table-alignment.txt |  3 ++
 .../expected/table/nested-table-box-width.txt |  3 ++
 .../table/percentage-width-columns.txt        |  3 ++
 ...ge-width-for-nested-table-is-like-auto.txt |  3 ++
 .../percentage-width-max-width-columns.txt    |  3 ++
 .../propagate-style-update-to-wrapper.txt     |  3 ++
 .../row-outer-size-with-computed-size.txt     |  3 ++
 .../Layout/expected/table/row-px-height.txt   |  3 ++
 .../table/row-span-and-nested-tables.txt      |  3 ++
 .../table/rows-height-distribution-1.txt      |  3 ++
 .../table/rows-height-distribution-2.txt      |  3 ++
 .../table/rows-height-distribution-3.txt      |  3 ++
 .../table/rows-height-distribution-4.txt      |  3 ++
 .../rowspan-with-trailing-characters.txt      |  3 ++
 .../LibWeb/Layout/expected/table/rowspan.txt  |  3 ++
 Tests/LibWeb/Layout/expected/table/size.txt   |  3 ++
 .../table/stretch-to-fixed-height.txt         |  3 ++
 ...alidation-propagation-to-table-wrapper.txt |  3 ++
 ...percentage-column-widths-less-than-100.txt |  3 ++
 .../table/table-align-center-with-margin.txt  |  3 ++
 .../expected/table/table-align-center.txt     |  3 ++
 .../table/table-cell-not-paintable.txt        |  3 ++
 .../expected/table/table-cellpadding.txt      |  3 ++
 .../table-fixup-font-size-and-line-height.txt |  3 ++
 ...e-formation-with-rowspan-in-the-middle.txt |  3 ++
 .../table/table-header-and-footer-groups.txt  |  3 ++
 .../table/table-max-content-width.txt         |  3 ++
 ...ble-width-max-content-containing-block.txt |  3 ++
 .../table/table-width-max-content.txt         |  3 ++
 ...ble-width-min-content-containing-block.txt |  3 ++
 .../table/table-width-min-content.txt         |  3 ++
 .../Layout/expected/table/table-width.txt     |  3 ++
 .../Layout/expected/table/td-valign.txt       |  3 ++
 .../table/top-caption-with-padding.txt        |  3 ++
 .../Layout/expected/table/tr-valign.txt       |  3 ++
 .../table/vertical-align-baseline.txt         |  3 ++
 .../table/vertical-align-middle-td-vs-div.txt |  3 ++
 .../table/vertical-align-middle-vs-top.txt    |  3 ++
 ...strained-columns-increased-size-on-col.txt |  3 ++
 ...on-and-constrained-columns-size-on-col.txt |  3 ++
 ...h-distribution-and-constrained-columns.txt |  3 ++
 ...th-distribution-of-max-width-increment.txt |  3 ++
 .../expected/table/zero-columns-gridmax.txt   |  3 ++
 .../text-align-justify-with-forced-break.txt  |  3 ++
 .../Layout/expected/text-align-overflow.txt   |  3 ++
 .../text-collapse-inside-contenteditable.txt  |  3 ++
 Tests/LibWeb/Layout/expected/text-indent.txt  |  3 ++
 .../Layout/expected/textarea-content.txt      |  3 ++
 .../LibWeb/Layout/expected/textarea-reset.txt |  3 ++
 .../tolerate-css-percentage-overshoot.txt     |  3 ++
 Tests/LibWeb/Layout/expected/top-layer.txt    |  5 +++
 .../expected/transform-calc-length-values.txt |  4 ++
 ...uto-when-aspect-ratio-cant-be-resolved.txt |  3 ++
 Tests/LibWeb/Layout/expected/ul-render.txt    |  3 ++
 .../expected/unicode-password-input.txt       |  3 ++
 ...-be-xhtml-file-should-decode-correctly.txt |  3 ++
 .../Layout/expected/vertical-align-middle.txt |  3 ++
 .../vertical-padding-relative-to-cb-width.txt |  3 ++
 .../viewport-overflow-propagation-1.txt       |  3 ++
 .../viewport-overflow-propagation-2.txt       |  3 ++
 .../expected/writing-modes-direction-flex.txt |  3 ++
 .../writing-modes-direction-inline.txt        |  3 ++
 .../expected/writing-modes-vertical-rl.txt    |  3 ++
 ...-height-replaced-box-with-aspect-ratio.txt |  3 ++
 .../zero-height-viewport-svg-image.txt        |  3 ++
 ...ro-size-replaced-box-with-aspect-ratio.txt |  3 ++
 .../zero-width-viewport-svg-image.txt         |  3 ++
 .../zero_percent_width_nested_table.txt       |  3 ++
 Tests/LibWeb/test-web/main.cpp                |  2 +-
 776 files changed, 2365 insertions(+), 9 deletions(-)

diff --git a/Libraries/LibWeb/Painting/StackingContext.cpp b/Libraries/LibWeb/Painting/StackingContext.cpp
index f51f422b4cb..75fcac9c395 100644
--- a/Libraries/LibWeb/Painting/StackingContext.cpp
+++ b/Libraries/LibWeb/Painting/StackingContext.cpp
@@ -460,9 +460,8 @@ TraversalDecision StackingContext::hit_test(CSSPixelPoint position, HitTestType
     return TraversalDecision::Continue;
 }
 
-void StackingContext::dump(int indent) const
+void StackingContext::dump(StringBuilder& builder, int indent) const
 {
-    StringBuilder builder;
     for (int i = 0; i < indent; ++i)
         builder.append(' ');
     CSSPixelRect rect = paintable_box().absolute_rect();
@@ -478,9 +477,9 @@ void StackingContext::dump(int indent) const
     if (!affine_transform.is_identity()) {
         builder.appendff(", transform: {}", affine_transform);
     }
-    dbgln("{}", builder.string_view());
+    builder.append('\n');
     for (auto& child : m_children)
-        child->dump(indent + 1);
+        child->dump(builder, indent + 1);
 }
 
 }
diff --git a/Libraries/LibWeb/Painting/StackingContext.h b/Libraries/LibWeb/Painting/StackingContext.h
index 03e995e2c69..1d668133d71 100644
--- a/Libraries/LibWeb/Painting/StackingContext.h
+++ b/Libraries/LibWeb/Painting/StackingContext.h
@@ -40,7 +40,7 @@ public:
 
     Gfx::AffineTransform affine_transform_matrix() const;
 
-    void dump(int indent = 0) const;
+    void dump(StringBuilder&, int indent = 0) const;
 
     void sort();
 
diff --git a/Libraries/LibWebView/PageInfo.h b/Libraries/LibWebView/PageInfo.h
index 25f6ea6649d..af6a5a6cd4b 100644
--- a/Libraries/LibWebView/PageInfo.h
+++ b/Libraries/LibWebView/PageInfo.h
@@ -15,6 +15,7 @@ enum class PageInfoType {
     LayoutTree = 1 << 2,
     PaintTree = 1 << 3,
     GCGraph = 1 << 4,
+    StackingContextTree = 1 << 5,
 };
 
 AK_ENUM_BITWISE_OPERATORS(PageInfoType);
diff --git a/Services/WebContent/ConnectionFromClient.cpp b/Services/WebContent/ConnectionFromClient.cpp
index c17ac8a3394..24468a15ab4 100644
--- a/Services/WebContent/ConnectionFromClient.cpp
+++ b/Services/WebContent/ConnectionFromClient.cpp
@@ -278,8 +278,13 @@ void ConnectionFromClient::debug_request(u64 page_id, ByteString request, ByteSt
     if (request == "dump-stacking-context-tree") {
         if (auto* doc = page->page().top_level_browsing_context().active_document()) {
             if (auto* viewport = doc->layout_node()) {
-                if (auto* stacking_context = viewport->paintable_box()->stacking_context())
-                    stacking_context->dump();
+                auto& viewport_paintable = static_cast<Web::Painting::ViewportPaintable&>(*viewport->paintable_box());
+                viewport_paintable.build_stacking_context_tree_if_needed();
+                if (auto* stacking_context = viewport_paintable.stacking_context()) {
+                    StringBuilder builder;
+                    stacking_context->dump(builder);
+                    dbgln("{}", builder.string_view());
+                }
             }
         }
         return;
@@ -976,6 +981,33 @@ static void append_paint_tree(Web::Page& page, StringBuilder& builder)
     Web::dump_tree(builder, *layout_root->first_paintable());
 }
 
+static void append_stacking_context_tree(Web::Page& page, StringBuilder& builder)
+{
+    auto* document = page.top_level_browsing_context().active_document();
+    if (!document) {
+        builder.append("(no DOM tree)"sv);
+        return;
+    }
+
+    document->update_layout(Web::DOM::UpdateLayoutReason::Debugging);
+
+    auto* layout_root = document->layout_node();
+    if (!layout_root) {
+        builder.append("(no layout tree)"sv);
+        return;
+    }
+    if (!layout_root->first_paintable()) {
+        builder.append("(no paint tree)"sv);
+        return;
+    }
+
+    auto& viewport_paintable = static_cast<Web::Painting::ViewportPaintable&>(*layout_root->paintable_box());
+    viewport_paintable.build_stacking_context_tree_if_needed();
+    if (auto* stacking_context = viewport_paintable.stacking_context()) {
+        stacking_context->dump(builder);
+    }
+}
+
 static void append_gc_graph(StringBuilder& builder)
 {
     auto gc_graph = Web::Bindings::main_thread_vm().heap().dump_graph();
@@ -1008,6 +1040,12 @@ void ConnectionFromClient::request_internal_page_info(u64 page_id, WebView::Page
         append_paint_tree(page->page(), builder);
     }
 
+    if (has_flag(type, WebView::PageInfoType::StackingContextTree)) {
+        if (!builder.is_empty())
+            builder.append("\n"sv);
+        append_stacking_context_tree(page->page(), builder);
+    }
+
     if (has_flag(type, WebView::PageInfoType::GCGraph)) {
         if (!builder.is_empty())
             builder.append("\n"sv);
diff --git a/Tests/LibWeb/Layout/expected/Element-insertAdjacentHTML.txt b/Tests/LibWeb/Layout/expected/Element-insertAdjacentHTML.txt
index 5108abc5ab6..3d40f0ffad5 100644
--- a/Tests/LibWeb/Layout/expected/Element-insertAdjacentHTML.txt
+++ b/Tests/LibWeb/Layout/expected/Element-insertAdjacentHTML.txt
@@ -41,3 +41,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,206 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,224 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x232] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/HTMLImageElement-update-the-image-data-temporary-document.txt b/Tests/LibWeb/Layout/expected/HTMLImageElement-update-the-image-data-temporary-document.txt
index a8520c1ab91..29879a0b11e 100644
--- a/Tests/LibWeb/Layout/expected/HTMLImageElement-update-the-image-data-temporary-document.txt
+++ b/Tests/LibWeb/Layout/expected/HTMLImageElement-update-the-image-data-temporary-document.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#image-container) [8,8 784x150]
         ImagePaintable (ImageBox<IMG>) [8,8 150x150]
       PaintableWithLines (BlockContainer(anonymous)) [8,158 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/HTMLSelectElement-selected-index.txt b/Tests/LibWeb/Layout/expected/HTMLSelectElement-selected-index.txt
index 66e8be53d70..934812ed6a8 100644
--- a/Tests/LibWeb/Layout/expected/HTMLSelectElement-selected-index.txt
+++ b/Tests/LibWeb/Layout/expected/HTMLSelectElement-selected-index.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>) [75.390625,11 16x16]
             SVGSVGPaintable (SVGSVGBox<svg>) [75.390625,11 16x16]
               SVGPathPaintable (SVGGeometryBox<path>) [79.390625,16.71875 8x4.953125]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-box-bottom-with-max-height.txt b/Tests/LibWeb/Layout/expected/abspos-box-bottom-with-max-height.txt
index 9a8a1f5838d..a16887e5c99 100644
--- a/Tests/LibWeb/Layout/expected/abspos-box-bottom-with-max-height.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-box-bottom-with-max-height.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,550 100x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-box-with-block-level-sibling.txt b/Tests/LibWeb/Layout/expected/abspos-box-with-block-level-sibling.txt
index 1a9fcb8afc2..b5baf665253 100644
--- a/Tests/LibWeb/Layout/expected/abspos-box-with-block-level-sibling.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-box-with-block-level-sibling.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.static) [18,18 210x210]
       PaintableWithLines (BlockContainer<DIV>.absolute) [18,228 110x210]
       PaintableWithLines (BlockContainer(anonymous)) [18,228 764x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [5,5 790x236] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-box-with-replaced-element.txt b/Tests/LibWeb/Layout/expected/abspos-box-with-replaced-element.txt
index 61bc33c1c88..af66f4d8ec5 100644
--- a/Tests/LibWeb/Layout/expected/abspos-box-with-replaced-element.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-box-with-replaced-element.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 502x102] overflow: [10,10 501x100]
       PaintableWithLines (BlockContainer<DIV>.image-container) [260,10 250x30.46875] overflow: [261,11 250x28.46875]
         ImagePaintable (ImageBox<IMG>) [261,11 250x28.46875]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-flex-container-with-auto-height.txt b/Tests/LibWeb/Layout/expected/abspos-flex-container-with-auto-height.txt
index 3361bf56b23..61bb9a09e74 100644
--- a/Tests/LibWeb/Layout/expected/abspos-flex-container-with-auto-height.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-flex-container-with-auto-height.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 514.859375x22]
       PaintableWithLines (BlockContainer<DIV>) [9,9 512.859375x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-flex-margin-limits-1.txt b/Tests/LibWeb/Layout/expected/abspos-flex-margin-limits-1.txt
index 18cf45cfc96..41bf6b17ab7 100644
--- a/Tests/LibWeb/Layout/expected/abspos-flex-margin-limits-1.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-flex-margin-limits-1.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableBox (Box<DIV>.container) [8,8 100x100]
         PaintableWithLines (BlockContainer<DIV>.bottom-left) [8,38 70x70]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-flex-margin-limits-2.txt b/Tests/LibWeb/Layout/expected/abspos-flex-margin-limits-2.txt
index 44cee02c6af..0ce53e73910 100644
--- a/Tests/LibWeb/Layout/expected/abspos-flex-margin-limits-2.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-flex-margin-limits-2.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableBox (Box<DIV>.container) [8,8 100x100]
         PaintableWithLines (BlockContainer<DIV>.top-right) [38,8 70x70]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-height.txt b/Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-height.txt
index 56e5d51b2f2..df91ba3a17f 100644
--- a/Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-height.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-height.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<NAV>) [10,10 312.453125x22]
         PaintableWithLines (BlockContainer<DIV>.item) [11,11 310.453125x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-width.txt b/Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-width.txt
index aed02f1ad8e..c17e2d6dd14 100644
--- a/Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-width.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-width.txt
@@ -32,3 +32,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer(anonymous)) [83,8 50x0]
         PaintableWithLines (BlockContainer(anonymous)) [8,8 200x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,108 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-image-with-min-height-constraint.txt b/Tests/LibWeb/Layout/expected/abspos-image-with-min-height-constraint.txt
index a2a2947772a..8cb0dffa3ed 100644
--- a/Tests/LibWeb/Layout/expected/abspos-image-with-min-height-constraint.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-image-with-min-height-constraint.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 808x608]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       ImagePaintable (ImageBox<IMG>#zero-dimensions-but-min-percentages) [8,8 800x600]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-non-bfc-root-with-min-height-constraint.txt b/Tests/LibWeb/Layout/expected/abspos-non-bfc-root-with-min-height-constraint.txt
index 3023858506e..3a89e1f6cae 100644
--- a/Tests/LibWeb/Layout/expected/abspos-non-bfc-root-with-min-height-constraint.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-non-bfc-root-with-min-height-constraint.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 31.15625x300]
       PaintableWithLines (BlockContainer<DIV>) [8,8 31.15625x300]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-not-replaced-multiple-auto-variants.txt b/Tests/LibWeb/Layout/expected/abspos-not-replaced-multiple-auto-variants.txt
index 4da349fa811..232dca4f4ee 100644
--- a/Tests/LibWeb/Layout/expected/abspos-not-replaced-multiple-auto-variants.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-not-replaced-multiple-auto-variants.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.only-t-l) [5,5 12x12]
       PaintableWithLines (BlockContainer<DIV>.only-mt-ml) [15,15 12x12]
       PaintableWithLines (BlockContainer<DIV>.both) [10,10 12x12]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-static-position-containing-block-inline-situation.txt b/Tests/LibWeb/Layout/expected/abspos-static-position-containing-block-inline-situation.txt
index 633ce45fb4a..ef01b5186a5 100644
--- a/Tests/LibWeb/Layout/expected/abspos-static-position-containing-block-inline-situation.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-static-position-containing-block-inline-situation.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<MAIN>) [8,13 0x0]
         PaintableWithLines (BlockContainer<DIV>) [8,0 36.84375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-with-percentage-insets.txt b/Tests/LibWeb/Layout/expected/abspos-with-percentage-insets.txt
index bb927dc8be0..934b20e8058 100644
--- a/Tests/LibWeb/Layout/expected/abspos-with-percentage-insets.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-with-percentage-insets.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.two) [329.5625,350 30.4375x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/abspos-with-static-position-in-one-axis.txt b/Tests/LibWeb/Layout/expected/abspos-with-static-position-in-one-axis.txt
index 70a7d0dbd88..5f3af91fc25 100644
--- a/Tests/LibWeb/Layout/expected/abspos-with-static-position-in-one-axis.txt
+++ b/Tests/LibWeb/Layout/expected/abspos-with-static-position-in-one-axis.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x18]
         TextPaintable (TextNode<#text>)
       ImagePaintable (ImageBox<IMG>) [50,26 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/acid1.txt b/Tests/LibWeb/Layout/expected/acid1.txt
index 6e775d80025..ae21ffc2af3 100644
--- a/Tests/LibWeb/Layout/expected/acid1.txt
+++ b/Tests/LibWeb/Layout/expected/acid1.txt
@@ -175,3 +175,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [20,400 480x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x420] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/actually-ignore-the-negative-overflow-region.txt b/Tests/LibWeb/Layout/expected/actually-ignore-the-negative-overflow-region.txt
index d9e2e3e8af5..38428ed8d1c 100644
--- a/Tests/LibWeb/Layout/expected/actually-ignore-the-negative-overflow-region.txt
+++ b/Tests/LibWeb/Layout/expected/actually-ignore-the-negative-overflow-region.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableBox (Box<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [-5000,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/anonymous-wrappers-continue-to-inherit-style-after-change.txt b/Tests/LibWeb/Layout/expected/anonymous-wrappers-continue-to-inherit-style-after-change.txt
index 2da711341dd..e9e4ea3d207 100644
--- a/Tests/LibWeb/Layout/expected/anonymous-wrappers-continue-to-inherit-style-after-change.txt
+++ b/Tests/LibWeb/Layout/expected/anonymous-wrappers-continue-to-inherit-style-after-change.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,79.875 784x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x105.875] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/aspect-ratio-auto-and-ratio.txt b/Tests/LibWeb/Layout/expected/aspect-ratio-auto-and-ratio.txt
index 91153d6c4ea..e11dba41d32 100644
--- a/Tests/LibWeb/Layout/expected/aspect-ratio-auto-and-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/aspect-ratio-auto-and-ratio.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 202x102]
       PaintableWithLines (BlockContainer(anonymous)) [8,110 784x202]
         ImagePaintable (ImageBox<IMG>) [8,110 202x202]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x320] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/aspect-ratio-auto.txt b/Tests/LibWeb/Layout/expected/aspect-ratio-auto.txt
index 498965bd045..65fd2d2ed0d 100644
--- a/Tests/LibWeb/Layout/expected/aspect-ratio-auto.txt
+++ b/Tests/LibWeb/Layout/expected/aspect-ratio-auto.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 202x2]
       PaintableWithLines (BlockContainer(anonymous)) [8,10 784x202]
         ImagePaintable (ImageBox<IMG>) [8,10 202x202]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/aspect-ratio-degenerate-ratio.txt b/Tests/LibWeb/Layout/expected/aspect-ratio-degenerate-ratio.txt
index 3ad1c4a7e15..15569b28e81 100644
--- a/Tests/LibWeb/Layout/expected/aspect-ratio-degenerate-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/aspect-ratio-degenerate-ratio.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x216]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x200]
       ImagePaintable (ImageBox<IMG>) [8,8 200x200]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/aspect-ratio-ratio.txt b/Tests/LibWeb/Layout/expected/aspect-ratio-ratio.txt
index 6c1eafbb38a..2a2b8cc13f5 100644
--- a/Tests/LibWeb/Layout/expected/aspect-ratio-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/aspect-ratio-ratio.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 202x102]
       PaintableWithLines (BlockContainer(anonymous)) [8,110 784x102]
         ImagePaintable (ImageBox<IMG>) [8,110 202x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/auto-margin-max-width-container.txt b/Tests/LibWeb/Layout/expected/auto-margin-max-width-container.txt
index df9dcf6af86..a4f89db8ff2 100644
--- a/Tests/LibWeb/Layout/expected/auto-margin-max-width-container.txt
+++ b/Tests/LibWeb/Layout/expected/auto-margin-max-width-container.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableWithLines (BlockContainer<DIV>) [204,8 392x100]
       PaintableWithLines (BlockContainer(anonymous)) [8,108 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/automatic-height-of-non-replaced-abspos-element-must-not-be-negative.txt b/Tests/LibWeb/Layout/expected/automatic-height-of-non-replaced-abspos-element-must-not-be-negative.txt
index 463e9e9b967..f2899df796b 100644
--- a/Tests/LibWeb/Layout/expected/automatic-height-of-non-replaced-abspos-element-must-not-be-negative.txt
+++ b/Tests/LibWeb/Layout/expected/automatic-height-of-non-replaced-abspos-element-must-not-be-negative.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x0]
     PaintableWithLines (BlockContainer<BODY>.outer) [8,8 0x0] overflow: [8,8 2x2]
       PaintableWithLines (BlockContainer<DIV>.inner) [8,8 2x2]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/automatic-width-of-non-replaced-abspos-element-must-not-be-negative.txt b/Tests/LibWeb/Layout/expected/automatic-width-of-non-replaced-abspos-element-must-not-be-negative.txt
index aa093d7a4f7..da0cb78d983 100644
--- a/Tests/LibWeb/Layout/expected/automatic-width-of-non-replaced-abspos-element-must-not-be-negative.txt
+++ b/Tests/LibWeb/Layout/expected/automatic-width-of-non-replaced-abspos-element-must-not-be-negative.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x0]
     PaintableWithLines (BlockContainer<BODY>.outer) [8,8 0x0] overflow: [8,8 2x2]
       PaintableWithLines (BlockContainer<DIV>.inner) [8,8 2x2]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/bfc-fit-content-width-with-margin.txt b/Tests/LibWeb/Layout/expected/bfc-fit-content-width-with-margin.txt
index a0a9c603b7a..0de419399dd 100644
--- a/Tests/LibWeb/Layout/expected/bfc-fit-content-width-with-margin.txt
+++ b/Tests/LibWeb/Layout/expected/bfc-fit-content-width-with-margin.txt
@@ -51,3 +51,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.margin-right) [8,170 548.8125x126]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,296 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x304] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/blank.txt b/Tests/LibWeb/Layout/expected/blank.txt
index e3bc5878a33..297f30da162 100644
--- a/Tests/LibWeb/Layout/expected/blank.txt
+++ b/Tests/LibWeb/Layout/expected/blank.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer(anonymous)) [0,0 800x0]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-br.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-br.txt
index a2f6cfc5b83..6107cdbbc1d 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-br.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-br.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       TextPaintable (TextNode<#text>)
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-grid-with-definite-width.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-grid-with-definite-width.txt
index a5b966ec346..056e3a09024 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-grid-with-definite-width.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-grid-with-definite-width.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.box) [0,10 202x74]
         PaintableWithLines (BlockContainer(anonymous)) [1,11 200x72]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-only-with-inset-left.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-only-with-inset-left.txt
index 27b00dd8f7f..a0bf4addb75 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-only-with-inset-left.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-only-with-inset-left.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x314]
       PaintableWithLines (BlockContainer<DIV>.box) [10,10 272x312]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,21 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x330] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-auto-margins-in-inline-axis.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-auto-margins-in-inline-axis.txt
index 5cc99d73cf6..662c1ed27d5 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-auto-margins-in-inline-axis.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-auto-margins-in-inline-axis.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#foo) [349,0 102x102]
       PaintableWithLines (BlockContainer<DIV>#bar) [698,100 102x102]
       PaintableWithLines (BlockContainer<DIV>#baz) [0,200 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-bottom-right-insets-relative-to-box-with-paddings.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-bottom-right-insets-relative-to-box-with-paddings.txt
index 38f7d4fedc4..33adc537ebd 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-bottom-right-insets-relative-to-box-with-paddings.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-bottom-right-insets-relative-to-box-with-paddings.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x314]
       PaintableWithLines (BlockContainer<DIV>.box) [10,10 272x312]
         PaintableWithLines (BlockContainer<DIV>.inner) [179,219 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x330] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-insets-and-auto-margins.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-insets-and-auto-margins.txt
index eb63835c552..97fbb80a43b 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-insets-and-auto-margins.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-insets-and-auto-margins.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.features-list) [8,8 402x402]
         PaintableWithLines (BlockContainer<DIV>.feature) [108,9 202x202]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x418] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-percentage-height-resolved-against-padding-box-of-containing-block.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-percentage-height-resolved-against-padding-box-of-containing-block.txt
index 2659c8440a0..1a22555ec5d 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-percentage-height-resolved-against-padding-box-of-containing-block.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-percentage-height-resolved-against-padding-box-of-containing-block.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x256]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x240]
       PaintableWithLines (BlockContainer<DIV>.abspos) [8,8 784x240]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x256] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-percentage-padding.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-percentage-padding.txt
index fa5a5f127f7..9c723e9f3ce 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-percentage-padding.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-with-percentage-padding.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x314]
       PaintableWithLines (BlockContainer<DIV>.box) [10,10 272x312]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,21 210x210]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x330] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-without-insets-relative-top-box-with-padding-top.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-without-insets-relative-top-box-with-padding-top.txt
index 60e313a1ce5..730df46a04d 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-without-insets-relative-top-box-with-padding-top.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-without-insets-relative-top-box-with-padding-top.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x50] overflow: [8,8 784x100]
       PaintableWithLines (BlockContainer<DIV>.box) [8,8 784x50] overflow: [8,8 784x100]
         PaintableWithLines (BlockContainer<DIV>.inner) [8,58 784x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-without-insets.txt b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-without-insets.txt
index feec1225512..daf992ca8a6 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/abspos-without-insets.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/abspos-without-insets.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x314]
       PaintableWithLines (BlockContainer<DIV>.box) [10,10 272x312]
         PaintableWithLines (BlockContainer<DIV>.inner) [31,21 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x330] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/aspect-ratio-but-width-and-height-are-auto.txt b/Tests/LibWeb/Layout/expected/block-and-inline/aspect-ratio-but-width-and-height-are-auto.txt
index 3725648f0c8..808b4637779 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/aspect-ratio-but-width-and-height-are-auto.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/aspect-ratio-but-width-and-height-are-auto.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<DIV>.box) [8,8 192x192]
         PaintableWithLines (BlockContainer(anonymous)) [200,8 36.84375x192]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x208] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-aspect-ratio-2.txt b/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-aspect-ratio-2.txt
index e33bc8dd3c9..1e0153d9e40 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-aspect-ratio-2.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-aspect-ratio-2.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 100x100]
       PaintableWithLines (BlockContainer(anonymous)) [8,8 9.46875x100]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-percentage-vertical-align.txt b/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-percentage-vertical-align.txt
index 1633ad06157..71a7033d26d 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-percentage-vertical-align.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-percentage-vertical-align.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [1,1 798x62.40625] overflow: [2,2 796x64]
       PaintableWithLines (BlockContainer<DIV>.clump) [2,2 32x32]
       PaintableWithLines (BlockContainer<DIV>.clump) [3,34 32x32]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x62.40625] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-white-space-nowrap.txt b/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-white-space-nowrap.txt
index 99c3244a4d8..667e27f3fff 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-white-space-nowrap.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/atomic-inline-with-white-space-nowrap.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 37.15625x18]
         TextPaintable (TextNode<#text>)
         ImagePaintable (ImageBox<IMG>) [35.15625,11 10x10]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/automatic-size-of-block-container-with-inline-children-and-nonempty-floating-child.txt b/Tests/LibWeb/Layout/expected/block-and-inline/automatic-size-of-block-container-with-inline-children-and-nonempty-floating-child.txt
index c3048027201..32307e6e3bc 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/automatic-size-of-block-container-with-inline-children-and-nonempty-floating-child.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/automatic-size-of-block-container-with-inline-children-and-nonempty-floating-child.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 140x100]
       PaintableWithLines (BlockContainer<DIV>.black) [8,8 140x100] overflow: [58,58 40x40]
         PaintableWithLines (BlockContainer<DIV>.green) [58,58 40x40]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/bfc-consider-all-currently-stacked-floats.txt b/Tests/LibWeb/Layout/expected/block-and-inline/bfc-consider-all-currently-stacked-floats.txt
index 26ea6e159ff..51f83aaa0b9 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/bfc-consider-all-currently-stacked-floats.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/bfc-consider-all-currently-stacked-floats.txt
@@ -39,3 +39,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x108] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/bfc-float-left-break-vertically-2.txt b/Tests/LibWeb/Layout/expected/block-and-inline/bfc-float-left-break-vertically-2.txt
index 18facbc4253..9375f907c0d 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/bfc-float-left-break-vertically-2.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/bfc-float-left-break-vertically-2.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.green) [0,50 150x50]
       PaintableWithLines (BlockContainer<DIV>.orange) [0,100 150x50]
       PaintableWithLines (BlockContainer(anonymous)) [0,0 200x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x150] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/bfc-float-left-break-vertically.txt b/Tests/LibWeb/Layout/expected/block-and-inline/bfc-float-left-break-vertically.txt
index 6dcaac530c7..832497e2486 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/bfc-float-left-break-vertically.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/bfc-float-left-break-vertically.txt
@@ -26,3 +26,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.orange) [65,3 252x52]
       PaintableWithLines (BlockContainer(anonymous)) [2,4 400x0] overflow: [2,55 102x52]
         PaintableWithLines (BlockContainer<DIV>.green) [2,55 102x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x106] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/bfc-root-auto-height-expands-for-descendants-with-margin-top.txt b/Tests/LibWeb/Layout/expected/block-and-inline/bfc-root-auto-height-expands-for-descendants-with-margin-top.txt
index 7c308c43894..73a8f07f77e 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/bfc-root-auto-height-expands-for-descendants-with-margin-top.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/bfc-root-auto-height-expands-for-descendants-with-margin-top.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#pink) [8,200 100x100]
         PaintableWithLines (BlockContainer<DIV>#orange) [8,200 50x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 100x308] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-inside-inline.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-inside-inline.txt
index aea00bdc214..4617653c1c1 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-inside-inline.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-inside-inline.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [43.15625,26 27.640625x0]
           PaintableWithLines (InlineNode<SPAN>) [43.15625,26 0x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-level-floating-box-with-clearance.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-level-floating-box-with-clearance.txt
index 90b615e7728..569ed43fc79 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-level-floating-box-with-clearance.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-level-floating-box-with-clearance.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x976]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.normal) [8,328 320x320]
       PaintableWithLines (BlockContainer<DIV>.normal) [8,648 320x320]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x976] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width-constraints.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width-constraints.txt
index 7fd0df24683..5b42c2bb853 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width-constraints.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width-constraints.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.box2) [10,30 140.28125x20]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,50 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x58] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width.txt
index 0576536f7f5..c5d5b85c1d8 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-fit-content-width.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.box) [10,10 140.28125x20]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,30 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float-and-margin-left.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float-and-margin-left.txt
index 1f286100610..e9b3035160b 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float-and-margin-left.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float-and-margin-left.txt
@@ -35,3 +35,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [109,29 682x0]
         PaintableWithLines (BlockContainer(anonymous)) [109,29 682x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,30 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x48] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float.txt
index a20a31cd4c5..d911283b507 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-float.txt
@@ -41,3 +41,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [108,26 684x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-sibling-float.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-sibling-float.txt
index 839c65b65ef..dd8fca8b6c8 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-sibling-float.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-hidden-overflow-after-sibling-float.txt
@@ -66,3 +66,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer(anonymous)) [108,44 684x0]
         PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-max-content-width.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-max-content-width.txt
index 623e3ca1126..c27bee8d137 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-max-content-width.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-max-content-width.txt
@@ -32,3 +32,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.baz) [10,50 185.078125x20]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,70 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x78] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-min-content-width.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-min-content-width.txt
index af0c549afe7..b76a2dbc2b7 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-min-content-width.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-min-content-width.txt
@@ -38,3 +38,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.baz) [10,86 95.765625x38]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,124 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x132] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-negative-margin-and-no-intruding-floats.txt b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-negative-margin-and-no-intruding-floats.txt
index 67cad195ba6..d513b36aa63 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/block-with-negative-margin-and-no-intruding-floats.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/block-with-negative-margin-and-no-intruding-floats.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [109,9 302x40] overflow: [60,10 350x38]
       PaintableWithLines (BlockContainer<DIV>) [60,10 202x38]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x56] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/box-with-clearance-and-margin-top.txt b/Tests/LibWeb/Layout/expected/block-and-inline/box-with-clearance-and-margin-top.txt
index 41c71497fc4..853b81decc2 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/box-with-clearance-and-margin-top.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/box-with-clearance-and-margin-top.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.square.white) [8,8 100x100]
         PaintableWithLines (BlockContainer<DIV>.clearfix) [8,108 10x10]
         PaintableWithLines (BlockContainer<DIV>.square.black) [8,218 49x49]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x267] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/box-with-percentage-height-wrapped-in-anonymous.txt b/Tests/LibWeb/Layout/expected/block-and-inline/box-with-percentage-height-wrapped-in-anonymous.txt
index cfd86495101..c92bafff7fd 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/box-with-percentage-height-wrapped-in-anonymous.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/box-with-percentage-height-wrapped-in-anonymous.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [8,126 100x18]
           PaintableWithLines (InlineNode<DIV>.inline) [8,126 9.46875x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-baseline-align.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-baseline-align.txt
index a3cbc8a60a0..047ff5a3c07 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-baseline-align.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-baseline-align.txt
@@ -32,3 +32,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [40.828125,10 23.359375x46]
             PaintableWithLines (BlockContainer(anonymous)) [40.828125,10 23.359375x46]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-image-only.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-image-only.txt
index f40e986ddec..b6294313b40 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-image-only.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-image-only.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [13,10 420x420]
           PaintableWithLines (BlockContainer(anonymous)) [13,10 420x420]
             ImagePaintable (ImageBox<IMG>) [13,10 420x420]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x440] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-should-have-vertically-aligned-content.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-should-have-vertically-aligned-content.txt
index 49c2d48c1b1..b9f8ac97f33 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-should-have-vertically-aligned-content.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-should-have-vertically-aligned-content.txt
@@ -34,3 +34,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<DIV>.border-black) [22,67 48.6875x120]
               TextPaintable (TextNode<#text>)
             PaintableWithLines (BlockContainer(anonymous)) [22,187 48.6875x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-width.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-width.txt
index f1520040afe..4645b083b0c 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-width.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-width.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [13,32 324.671875x18]
           PaintableWithLines (BlockContainer(anonymous)) [13,32 324.671875x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-abspos-pseudo-element.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-abspos-pseudo-element.txt
index 35e1c5f71e2..85f378cc77e 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-abspos-pseudo-element.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-abspos-pseudo-element.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [29,29 0x0]
           PaintableWithLines (BlockContainer(anonymous)) [29,29 0x0]
             PaintableWithLines (BlockContainer(anonymous)) [9,9 40x40]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x58] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-after-pseudo.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-after-pseudo.txt
index bb75b4ba8c0..1a2d7477825 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-after-pseudo.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-after-pseudo.txt
@@ -19,3 +19,7 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [13,10 414.703125x57]
             TextPaintable (TextNode<#text>)
             PaintableWithLines (BlockContainer(anonymous)) [9,9 422.703125x59]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x77] [children: 1] (z-index: auto)
+  SC for BlockContainer(anonymous) [9,9 422.703125x59] [children: 0] (z-index: -1)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-before-pseudo.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-before-pseudo.txt
index efe17226fb3..e92575b9206 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-before-pseudo.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-before-pseudo.txt
@@ -19,3 +19,7 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [13,10 414.703125x57]
             PaintableWithLines (BlockContainer(anonymous)) [9,9 422.703125x59]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x77] [children: 1] (z-index: auto)
+  SC for BlockContainer(anonymous) [9,9 422.703125x59] [children: 0] (z-index: -1)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-block-content-baseline-align.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-block-content-baseline-align.txt
index 6d6d21fa6e1..1273c09fbd3 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-block-content-baseline-align.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-block-content-baseline-align.txt
@@ -40,3 +40,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<DIV>) [40.828125,10 23.359375x46]
                 TextPaintable (TextNode<#text>)
               PaintableWithLines (BlockContainer(anonymous)) [40.828125,56 23.359375x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-min-height.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-min-height.txt
index a5cda47f4e1..39f2888e8d6 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-min-height.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-min-height.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [13,10 143.515625x100]
           PaintableWithLines (BlockContainer(anonymous)) [13,51 143.515625x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-multiple-words-text-node-label.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-multiple-words-text-node-label.txt
index 096039daaa7..5817cbbe12d 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-multiple-words-text-node-label.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-multiple-words-text-node-label.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [13,10 49.921875x18]
           PaintableWithLines (BlockContainer(anonymous)) [13,10 49.921875x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-text-node-label-and-font-size.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-text-node-label-and-font-size.txt
index e65971c1fe8..3e81e3f1fad 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-text-node-label-and-font-size.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-text-node-label-and-font-size.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [13,10 111.65625x55]
           PaintableWithLines (BlockContainer(anonymous)) [13,10 111.65625x55]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x75] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-text-node-label.txt b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-text-node-label.txt
index 192c740a583..3b9e1f57e66 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/button-with-text-node-label.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/button-with-text-node-label.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [13,10 37.21875x18]
           PaintableWithLines (BlockContainer(anonymous)) [13,10 37.21875x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/clear-both-from-inline-formatting-context.txt b/Tests/LibWeb/Layout/expected/block-and-inline/clear-both-from-inline-formatting-context.txt
index 114f823bf1b..5634cf05bb0 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/clear-both-from-inline-formatting-context.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/clear-both-from-inline-formatting-context.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.c) [8,157.875 11.5625x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x175.875] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/clear-both-without-introducing-clearance.txt b/Tests/LibWeb/Layout/expected/block-and-inline/clear-both-without-introducing-clearance.txt
index 261a689013e..3e04bc74375 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/clear-both-without-introducing-clearance.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/clear-both-without-introducing-clearance.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.mystery) [8,101 784x0]
       PaintableWithLines (BlockContainer<DIV>.lower) [8,101 784x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x127] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/clearfix.txt b/Tests/LibWeb/Layout/expected/block-and-inline/clearfix.txt
index 5aed71bfa8f..8835ef8faa3 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/clearfix.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/clearfix.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [8,108 784x0] overflow: [8,108 49x49]
           PaintableWithLines (BlockContainer<DIV>.square.black) [8,108 49x49]
       PaintableWithLines (BlockContainer(anonymous)) [8,108 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x157] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/columns-33-percent-width.txt b/Tests/LibWeb/Layout/expected/block-and-inline/columns-33-percent-width.txt
index 427d8efb877..594936fcc80 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/columns-33-percent-width.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/columns-33-percent-width.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 206.65625x100]
       PaintableWithLines (BlockContainer<DIV>) [214.65625,8 206.65625x100]
       PaintableWithLines (BlockContainer<DIV>) [421.3125,8 206.65625x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/flex-container-should-avoid-overlapping-floats.txt b/Tests/LibWeb/Layout/expected/block-and-inline/flex-container-should-avoid-overlapping-floats.txt
index a08ebe22ecc..5ad1440bfce 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/flex-container-should-avoid-overlapping-floats.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/flex-container-should-avoid-overlapping-floats.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.flex) [8,8 362.890625x50]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 32.34375x50]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-1.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-1.txt
index cfe728b1ac0..4b07b587502 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-1.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-1.txt
@@ -113,3 +113,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x342]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,350 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x358] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-2.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-2.txt
index 855df5b2b65..7b1dc48c01f 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-2.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-2.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#a) [8,8 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-3.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-3.txt
index 39ab3e5910e..0a76328c71b 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-3.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-3.txt
@@ -38,3 +38,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [9,127 778x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,128 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-4.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-4.txt
index 1376218853b..e1573f11727 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-4.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-4.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.right) [684,8 52x52] overflow: [685,9 50.78125x50]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-at-end-of-block.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-at-end-of-block.txt
index 88ae3c465b1..ede4acf3459 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-at-end-of-block.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-at-end-of-block.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
       PaintableWithLines (BlockContainer<DIV>.d) [8,208 500x200]
       PaintableWithLines (BlockContainer(anonymous)) [8,408 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x416] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-followed-by-block.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-followed-by-block.txt
index 1849ce9f337..81f9b5d04dd 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-followed-by-block.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-followed-by-block.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<P>) [8,124 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,158 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x158] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-followed-by-inline.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-followed-by-inline.txt
index 1e0db0d52bd..cf3c1378b74 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-followed-by-inline.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-by-line-break-followed-by-inline.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x118]
       PaintableWithLines (BlockContainer<DIV>.a) [8,8 100x100]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x134] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-right-should-not-affect-inline-left.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-right-should-not-affect-inline-left.txt
index 374c74788ca..8164b70956d 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-right-should-not-affect-inline-left.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-right-should-not-affect-inline-left.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.a) [342,241 300x225]
       PaintableWithLines (BlockContainer<DIV>.b) [8,104 634x300]
       PaintableWithLines (BlockContainer(anonymous)) [8,404 634x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 650x466] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-simultaneously.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-simultaneously.txt
index d713e87a733..cb42052d874 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-simultaneously.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-clear-simultaneously.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.c) [8,108 0x0]
       PaintableWithLines (BlockContainer<DIV>.d) [8,108 784x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,158 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-fits-exactly.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-fits-exactly.txt
index dd7c5e97432..c939842f67c 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-fits-exactly.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-fits-exactly.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.right.w320.red) [89,9 320x50]
         PaintableWithLines (BlockContainer<DIV>.left.w80.blue) [9,9 80x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,60 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x68] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-following-trailing-whitespace.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-following-trailing-whitespace.txt
index f884d4b2f88..7cfce797ad0 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-following-trailing-whitespace.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-following-trailing-whitespace.txt
@@ -26,3 +26,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.c) [58,8 50x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-initial-available-space-vs-height.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-initial-available-space-vs-height.txt
index 52ae9e422fa..a991e311432 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-initial-available-space-vs-height.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-initial-available-space-vs-height.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.c.l) [8,114 30x300]
         PaintableWithLines (BlockContainer<DIV>.c.r) [78,114 30x300]
       PaintableWithLines (BlockContainer(anonymous)) [8,14 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x414] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-inside-margin-auto-container.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-inside-margin-auto-container.txt
index 02c07759bc5..7a490db0905 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-inside-margin-auto-container.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-inside-margin-auto-container.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.b.g) [300,8 150x150]
         PaintableWithLines (BlockContainer<DIV>.b.r) [300,158 150x150]
       PaintableWithLines (BlockContainer(anonymous)) [8,308 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x316] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-intrusions-relative-coordinates.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-intrusions-relative-coordinates.txt
index f8f265503f9..7f43dd34baf 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-intrusions-relative-coordinates.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-intrusions-relative-coordinates.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,58 784x0] overflow: [8,58 784x100]
         PaintableWithLines (BlockContainer<DIV>.b.bug) [8,58 784x50]
         PaintableWithLines (BlockContainer<DIV>.c.bug) [8,108 784x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x158] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-left-and-right-with-justified-text-in-between.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-left-and-right-with-justified-text-in-between.txt
index b76ce535a31..f0ccaeef10f 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-left-and-right-with-justified-text-in-between.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-left-and-right-with-justified-text-in-between.txt
@@ -212,3 +212,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.left) [252,10 302x202]
       PaintableWithLines (BlockContainer<DIV>.right) [488,212 302x202]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x450] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-left-and-right-with-text-in-between.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-left-and-right-with-text-in-between.txt
index f4bf97199c0..3be6d9ce10c 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-left-and-right-with-text-in-between.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-left-and-right-with-text-in-between.txt
@@ -48,3 +48,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.left) [252,10 302x202]
       PaintableWithLines (BlockContainer<DIV>.right) [488,212 302x202]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x450] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-logical.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-logical.txt
index fb3a2bd3dc6..687022be362 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-logical.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-logical.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0] overflow: [8,8 784x52]
       PaintableWithLines (BlockContainer<DIV>#b) [8,8 52x52]
       PaintableWithLines (BlockContainer<DIV>#c) [740,8 52x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-max-content-containing-block-flex-display.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-max-content-containing-block-flex-display.txt
index 7b9be23d2a4..a1489d56813 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-max-content-containing-block-flex-display.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-max-content-containing-block-flex-display.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               TextPaintable (TextNode<#text>)
             PaintableWithLines (BlockContainer<SPAN>) [22.265625,8 9.34375x18]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x26] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-max-content-containing-block.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-max-content-containing-block.txt
index 769266a54ba..38febb17369 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-max-content-containing-block.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-max-content-containing-block.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<SPAN>) [22.265625,8 9.34375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x26] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-nested-under-eachother.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-nested-under-eachother.txt
index b32fbe9c2cb..d8ebb5dfefe 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-nested-under-eachother.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-nested-under-eachother.txt
@@ -28,3 +28,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [8,8 500x0] overflow: [288,28 220x20]
           PaintableWithLines (BlockContainer<DIV>.w220.right.blue) [288,28 220x20]
       PaintableWithLines (BlockContainer(anonymous)) [8,16 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x48] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-should-avoid-inline-block.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-should-avoid-inline-block.txt
index 922511060f5..bfff6e073cd 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-should-avoid-inline-block.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-should-avoid-inline-block.txt
@@ -22,3 +22,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.float-left) [11,31 234.734375x232]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x262] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-1.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-1.txt
index 1b71809f194..fe75a97910c 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-1.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-1.txt
@@ -68,3 +68,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.righty) [277,173 32x32]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x268] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-2.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-2.txt
index e59dcb53324..e05099c80f1 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-2.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-2.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<ARTICLE>.second) [50,150 200x50]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [0,50 800x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML>.js [0,0 800x200] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-3.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-3.txt
index 174d293e2a1..730ff7fefb4 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-3.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-stress-3.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.lefty) [9,9 52x52]
         PaintableWithLines (BlockContainer<DIV>.one) [61,25 202x52]
         PaintableWithLines (BlockContainer<DIV>.two) [107,77 202x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x268] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-under-if-would-fit.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-under-if-would-fit.txt
index cc391628c45..107aa8874b2 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-under-if-would-fit.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-under-if-would-fit.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.left.w40.yellow) [9,95 40x50]
         PaintableWithLines (BlockContainer<DIV>.left.w20.blue) [49,95 20x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,160 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x168] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-clearance-for-text-after-break.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-clearance-for-text-after-break.txt
index 81ea8916cd4..9d949749672 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-clearance-for-text-after-break.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-clearance-for-text-after-break.txt
@@ -22,3 +22,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,94 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x102] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-clearance-ignores-opposite-side.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-clearance-ignores-opposite-side.txt
index 36b6ae487f2..da2909169c6 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-clearance-ignores-opposite-side.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-clearance-ignores-opposite-side.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.c) [308,8 200x100]
         PaintableWithLines (BlockContainer<DIV>.d) [308,108 200x100]
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-offset-by-preceding-float.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-offset-by-preceding-float.txt
index 60036ad0d34..22eeb087ab5 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-offset-by-preceding-float.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-vertical-offset-by-preceding-float.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>) [8,86 50x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,86 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-with-inline-contents-hoisted.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-with-inline-contents-hoisted.txt
index c9b2080b573..88ebb7635ae 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-with-inline-contents-hoisted.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-with-inline-contents-hoisted.txt
@@ -38,3 +38,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>.box.blue) [8,208 100x100]
       PaintableWithLines (BlockContainer<DIV>) [8,112 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x308] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/float-with-negative-margins.txt b/Tests/LibWeb/Layout/expected/block-and-inline/float-with-negative-margins.txt
index 92479c93fd8..0f70d9c0674 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/float-with-negative-margins.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/float-with-negative-margins.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0] overflow: [8,-2 100x50]
       PaintableWithLines (BlockContainer<DIV>.r) [8,-2 50x50]
       PaintableWithLines (BlockContainer<DIV>.g) [58,-2 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x48] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/floating-box-with-box-sizing-border-box.txt b/Tests/LibWeb/Layout/expected/block-and-inline/floating-box-with-box-sizing-border-box.txt
index ad7a470f783..908a3656547 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/floating-box-with-box-sizing-border-box.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/floating-box-with-box-sizing-border-box.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x208]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0] overflow: [8,8 300x200]
       PaintableWithLines (BlockContainer<DIV>.box) [8,8 300x200]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x208] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/floats-and-negative-margins.txt b/Tests/LibWeb/Layout/expected/block-and-inline/floats-and-negative-margins.txt
index a899639eade..bb47196a421 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/floats-and-negative-margins.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/floats-and-negative-margins.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item) [175,8 125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/floats-with-negative-percentage-margins.txt b/Tests/LibWeb/Layout/expected/block-and-inline/floats-with-negative-percentage-margins.txt
index ddc0f485469..d28e0396a12 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/floats-with-negative-percentage-margins.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/floats-with-negative-percentage-margins.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>#right) [208,108 100x100]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x208] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/forced-break-stops-non-whitespace-sequence.txt b/Tests/LibWeb/Layout/expected/block-and-inline/forced-break-stops-non-whitespace-sequence.txt
index fbd4ea5e1f7..e2a01cf00eb 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/forced-break-stops-non-whitespace-sequence.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/forced-break-stops-non-whitespace-sequence.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<PRE>) [8,13 784x17]
         PaintableWithLines (InlineNode<SPAN>) [9,14 6.5x15]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x43] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/grid-container-should-avoid-overlapping-floats.txt b/Tests/LibWeb/Layout/expected/block-and-inline/grid-container-should-avoid-overlapping-floats.txt
index 61c536ec0a2..9b25f01cd17 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/grid-container-should-avoid-overlapping-floats.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/grid-container-should-avoid-overlapping-floats.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.right) [370.890625,8 37.109375x18]
         TextPaintable (TextNode<#text>)
       PaintableBox (Box<DIV>.grid) [8,8 362.890625x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/html-element-height-quirks-mode-off.txt b/Tests/LibWeb/Layout/expected/block-and-inline/html-element-height-quirks-mode-off.txt
index 0f0d8da3a9a..f1ed6b89500 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/html-element-height-quirks-mode-off.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/html-element-height-quirks-mode-off.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x136]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x120]
       PaintableWithLines (BlockContainer<DIV>.box) [18,18 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/html-element-height-quirks-mode-on.txt b/Tests/LibWeb/Layout/expected/block-and-inline/html-element-height-quirks-mode-on.txt
index 2c2f5b33142..e4620adde86 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/html-element-height-quirks-mode-on.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/html-element-height-quirks-mode-on.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x320]
       PaintableWithLines (BlockContainer<DIV>.box) [18,18 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/ifc-float-left-and-sibling-with-margin-left.txt b/Tests/LibWeb/Layout/expected/block-and-inline/ifc-float-left-and-sibling-with-margin-left.txt
index 85ef0ccfe51..261960cd951 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/ifc-float-left-and-sibling-with-margin-left.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/ifc-float-left-and-sibling-with-margin-left.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.thumbnail) [10,10 52x52]
       PaintableWithLines (BlockContainer<DIV>.title) [90,10 700x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x61] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-baseline-1.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-baseline-1.txt
index 5330409db13..bb9ceef022f 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-baseline-1.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-baseline-1.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.whee) [114.140625,51 202x52]
         PaintableWithLines (BlockContainer(anonymous)) [114.140625,103 202x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x112] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-baseline-2.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-baseline-2.txt
index a9b7e05ad9e..53f40202fe2 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-baseline-2.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-baseline-2.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.float) [114.140625,51 39.234375x20]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [114.140625,51 39.234375x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x80] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-contained-by-abspos-element.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-contained-by-abspos-element.txt
index d7451e78845..9fa63a8c933 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-contained-by-abspos-element.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-contained-by-abspos-element.txt
@@ -26,3 +26,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<H1>) [11,44.5 500x346]
           PaintableWithLines (BlockContainer<SPAN>) [12,45.5 498x344]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x20] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-leading-and-trailing-metrics.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-leading-and-trailing-metrics.txt
index 26a8123bfcf..661fb430081 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-leading-and-trailing-metrics.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-leading-and-trailing-metrics.txt
@@ -77,3 +77,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<U>) [131.59375,49 88.453125x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,68 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x76] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-percentage-max-width.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-percentage-max-width.txt
index 8306d1af164..8f948f32b30 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-percentage-max-width.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-percentage-max-width.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x98]
       PaintableWithLines (BlockContainer<DIV>) [8,8 134.109375x98]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x114] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-vertical-align-middle.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-vertical-align-middle.txt
index 4b444432c55..456ff772125 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-vertical-align-middle.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-vertical-align-middle.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (InlineNode<SPAN>) [8,48 135.15625x100]
         TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<SPAN>.thing) [43.15625,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-max-width-fit-content.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-max-width-fit-content.txt
index 898c67d7aa0..b5ad6adbd91 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-max-width-fit-content.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-max-width-fit-content.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x20]
       PaintableWithLines (BlockContainer<SPAN>) [8,8 102.203125x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-negative-margin-left.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-negative-margin-left.txt
index 487097ae0d2..ad2446d0a4f 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-negative-margin-left.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-negative-margin-left.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [0,0 160x60]
       PaintableWithLines (BlockContainer<DIV>.foo) [5,5 100x50]
       PaintableWithLines (BlockContainer<DIV>.bar) [55,5 100x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-negative-margin-right.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-negative-margin-right.txt
index 6b9949e44bf..7f38b52d695 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-negative-margin-right.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-negative-margin-right.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [0,0 160x60] overflow: [5,5 200x50]
       PaintableWithLines (BlockContainer<DIV>.foo) [5,5 100x50]
       PaintableWithLines (BlockContainer<DIV>.bar) [105,5 100x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-percentage-height-and-auto-height-of-containing-block.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-percentage-height-and-auto-height-of-containing-block.txt
index 6dc9fb43709..f3c5178081f 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-percentage-height-and-auto-height-of-containing-block.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-block-with-percentage-height-and-auto-height-of-containing-block.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.pure-menu-list) [8,8 784x18]
         PaintableWithLines (BlockContainer<DIV>.pure-menu-item) [8,8 36.453125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-positioned-with-top-left.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-positioned-with-top-left.txt
index 34c3cd9827c..79dd9e41617 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-positioned-with-top-left.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-positioned-with-top-left.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<SPAN>.displaced_text) [150.421875,48 110.375x20]
         TextPaintable (TextNode<#text>)
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-with-vertical-margins-vertical-align-top.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-with-vertical-margins-vertical-align-top.txt
index 6b7cf6b96a1..b815bd483e3 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-with-vertical-margins-vertical-align-top.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-with-vertical-margins-vertical-align-top.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>#inline-box) [51.125,58 100x100]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x191] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-with-vertical-margins.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-with-vertical-margins.txt
index 16a8130f879..20948ac56b7 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-with-vertical-margins.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-box-with-vertical-margins.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>#inline-box) [51.125,58 100x100]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x195] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-float-clear.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-float-clear.txt
index 17c72696471..c1b46e2ddb1 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-float-clear.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-float-clear.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>#C) [648.5,57 48x16]
       PaintableWithLines (BlockContainer<DIV>#D) [9,41 687.5x16]
       PaintableWithLines (BlockContainer(anonymous)) [9,57 687.5x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x73] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/inline-node-not-inserted-into-generated-box.txt b/Tests/LibWeb/Layout/expected/block-and-inline/inline-node-not-inserted-into-generated-box.txt
index a615716b6f8..4927004ebc9 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/inline-node-not-inserted-into-generated-box.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/inline-node-not-inserted-into-generated-box.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/intrinsic-sizing-with-min-width-specified.txt b/Tests/LibWeb/Layout/expected/block-and-inline/intrinsic-sizing-with-min-width-specified.txt
index c48765bb12b..63b23b238b0 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/intrinsic-sizing-with-min-width-specified.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/intrinsic-sizing-with-min-width-specified.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 106x36]
       PaintableWithLines (BlockContainer<DIV>.outer) [10,10 104x34]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,11 102x32]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/join-out-of-flow-box-with-previous-sibling-if-wrapped-in-anonymous-box.txt b/Tests/LibWeb/Layout/expected/block-and-inline/join-out-of-flow-box-with-previous-sibling-if-wrapped-in-anonymous-box.txt
index 27782d75030..6f3ec1ddd13 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/join-out-of-flow-box-with-previous-sibling-if-wrapped-in-anonymous-box.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/join-out-of-flow-box-with-previous-sibling-if-wrapped-in-anonymous-box.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,38 784x30]
         PaintableWithLines (BlockContainer<DIV>.tab) [8,38 200x30]
         PaintableWithLines (BlockContainer<DIV>.timeline) [592,38 200x30]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x76] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/leading-margin-on-inline-content-that-starts-with-collapsible-whitespace.txt b/Tests/LibWeb/Layout/expected/block-and-inline/leading-margin-on-inline-content-that-starts-with-collapsible-whitespace.txt
index 6c4ad162837..d55ff37e768 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/leading-margin-on-inline-content-that-starts-with-collapsible-whitespace.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/leading-margin-on-inline-content-that-starts-with-collapsible-whitespace.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (InlineNode<DIV>) [150.125,8 39.5625x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/list-markers-intruded-by-float.txt b/Tests/LibWeb/Layout/expected/block-and-inline/list-markers-intruded-by-float.txt
index fc59ccd6400..e005a4dab45 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/list-markers-intruded-by-float.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/list-markers-intruded-by-float.txt
@@ -57,3 +57,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (ListItemBox<LI>) [48,106 744x18]
           MarkerPaintable (ListItemMarkerBox(anonymous)) [304,106.5 12x17]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x140] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-1.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-1.txt
index 09cac0f9f6e..45358576944 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-1.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-1.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#bar) [33,152 102x102]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,279 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x279] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-2.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-2.txt
index aa0cb9c43ec..3dd69e03b19 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-2.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-2.txt
@@ -32,3 +32,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#baz) [8,242 102x102]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,344 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x352] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-3.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-3.txt
index f2994530683..ab1f00f8451 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-3.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-3.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#bar) [8,158 200x200]
         PaintableWithLines (BlockContainer<DIV>#baz) [8,158 100x100]
       PaintableWithLines (BlockContainer(anonymous)) [8,358 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x366] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-4.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-4.txt
index 62afe5685b0..f495aea66e7 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-4.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-4.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,158 784x0]
       PaintableWithLines (BlockContainer<DIV>#bar) [8,108 50x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,158 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-5.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-5.txt
index b477b1189a4..fed79843c59 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-5.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-5.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.hmm) [2,2 168.96875x20]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [2,122 168.96875x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x122] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-6.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-6.txt
index 6212d6df5d5..e5e3309fea6 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-6.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-collapse-6.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.upper) [8,8 784x20]
       PaintableWithLines (BlockContainer<DIV>.bfc) [8,78 784x20]
         PaintableWithLines (BlockContainer<DIV>.inner) [8,78 20x20]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x106] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-must-not-collapse-across-nested-bfc.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-must-not-collapse-across-nested-bfc.txt
index a4e10be97a8..07e9c4c6558 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-must-not-collapse-across-nested-bfc.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-must-not-collapse-across-nested-bfc.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.not-bfc) [8,30 784x20]
       PaintableWithLines (BlockContainer<DIV>.bfc) [8,80 784x0]
       PaintableWithLines (BlockContainer<DIV>.not-bfc) [8,110 784x20]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x138] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline-start.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline-start.txt
index ca26cf3ed63..3da5b52323b 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline-start.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline-start.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.b) [91,31 328x20]
           PaintableWithLines (InlineNode<SPAN>) [92,31 41.78125x20]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x100] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline.txt b/Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline.txt
index 8e9f9e7807b..930189c92e7 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/margin-padding-block-inline.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.b) [71,51 378x20]
           PaintableWithLines (InlineNode<SPAN>) [72,51 41.78125x20]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-for-box-with-inline-children.txt b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-for-box-with-inline-children.txt
index c38fbec259a..17b9c5e1336 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-for-box-with-inline-children.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-for-box-with-inline-children.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.outer) [10,10 204x175]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,11 202x173]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x193] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-must-not-expand-element.txt b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-must-not-expand-element.txt
index 668e63ec135..1625b81ae11 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-must-not-expand-element.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-must-not-expand-element.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 6x56]
       PaintableWithLines (BlockContainer<DIV>.outer) [10,10 4x54]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,11 2x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-on-block-level-box-that-creates-fc.txt b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-on-block-level-box-that-creates-fc.txt
index f9ae549b2ab..0fccbf85d37 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-on-block-level-box-that-creates-fc.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-on-block-level-box-that-creates-fc.txt
@@ -23,3 +23,7 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.b) [8,8 100x90] overflow: [8,8 105.5625x90]
           PaintableWithLines (BlockContainer(anonymous)) [8,8 105.5625x90]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 1] (z-index: auto)
+  SC for BlockContainer<DIV>.a [8,8 100x90] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-on-child-block-with-width-auto-contributes-to-intrinsic-size-of-parent.txt b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-on-child-block-with-width-auto-contributes-to-intrinsic-size-of-parent.txt
index 45f96b22ca0..ee8bbcd7794 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-on-child-block-with-width-auto-contributes-to-intrinsic-size-of-parent.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-on-child-block-with-width-auto-contributes-to-intrinsic-size-of-parent.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.middle) [10,10 204x22]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,11 202x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-100-border-box.txt b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-100-border-box.txt
index a67f017bc78..9279d8f7986 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-100-border-box.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-100-border-box.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 95.59375x22]
       PaintableWithLines (BlockContainer<NAV>) [10,10 93.59375x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-100.txt b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-100.txt
index 7a4df4ff6f7..6f79975816e 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-100.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-100.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 140.609375x22]
       PaintableWithLines (BlockContainer<DIV>) [10,10 138.609375x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-containing-block.txt b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-containing-block.txt
index 183dd27dfed..9f7c2bfe3a6 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-containing-block.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-percentage-containing-block.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x22]
       PaintableWithLines (BlockContainer<SPAN>.text) [10,10 68.671875x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-wrapped-in-max-content.txt b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-wrapped-in-max-content.txt
index 4345634ddd5..f4bc12c2e86 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/max-width-wrapped-in-max-content.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/max-width-wrapped-in-max-content.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [8,8 270x108]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer<DIV>) [8,116 270x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x124] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/min-width-for-box-with-inline-children.txt b/Tests/LibWeb/Layout/expected/block-and-inline/min-width-for-box-with-inline-children.txt
index 7ea60ea6799..ba086cbdb8e 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/min-width-for-box-with-inline-children.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/min-width-for-box-with-inline-children.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.outer) [10,10 604x61]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,11 602x59]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x79] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/narrow-bfc-width-to-avoid-overlap-with-floats.txt b/Tests/LibWeb/Layout/expected/block-and-inline/narrow-bfc-width-to-avoid-overlap-with-floats.txt
index 5f50d90a6ac..f7d2df0cbe2 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/narrow-bfc-width-to-avoid-overlap-with-floats.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/narrow-bfc-width-to-avoid-overlap-with-floats.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x1008]
         PaintableWithLines (BlockContainer<DIV>.float) [592,8 200x1000]
         PaintableWithLines (BlockContainer<DIV>.bfc) [8,8 584x110]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x1008] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/negative-margin-with-padding.txt b/Tests/LibWeb/Layout/expected/block-and-inline/negative-margin-with-padding.txt
index 5387fbf4f93..6e567933c64 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/negative-margin-with-padding.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/negative-margin-with-padding.txt
@@ -22,3 +22,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,-72 800x672]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [18,20 764x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x56] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/out-of-flows-not-inserted-into-generated-box.txt b/Tests/LibWeb/Layout/expected/block-and-inline/out-of-flows-not-inserted-into-generated-box.txt
index 262a6abcbe1..470ca7f31ab 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/out-of-flows-not-inserted-into-generated-box.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/out-of-flows-not-inserted-into-generated-box.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>) [8,26 27.640625x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x44] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-abspos-box-with-percentage-height-child.txt b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-abspos-box-with-percentage-height-child.txt
index f3839de3425..3f642085b80 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-abspos-box-with-percentage-height-child.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-abspos-box-with-percentage-height-child.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<MAIN>) [8,8 120x0] overflow: [8,8 120x40]
         PaintableWithLines (BlockContainer<DIV>#asset-grid) [8,8 120x20] overflow: [18,18 100x30]
           PaintableWithLines (BlockContainer<DIV>#virtual-timeline) [18,18 100x30]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-box-nested-into-percentage-height-box.txt b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-box-nested-into-percentage-height-box.txt
index 3e7eca42455..6e14a2882ef 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-box-nested-into-percentage-height-box.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-box-nested-into-percentage-height-box.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x300]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x300]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-in-quirks-mode.txt b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-in-quirks-mode.txt
index 7947568edfe..af2259bf611 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-in-quirks-mode.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-height-in-quirks-mode.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x616]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x616]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x600]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x616] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-height-with-containing-block-padding.txt b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-height-with-containing-block-padding.txt
index f759b5baa1f..c2fe1153779 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-height-with-containing-block-padding.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-height-with-containing-block-padding.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x616]
       PaintableWithLines (BlockContainer<DIV>.container) [8,8 784x600]
         PaintableWithLines (BlockContainer<DIV>.hmm) [8,108 784x270]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x616] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-height.txt b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-height.txt
index bf1cf29a801..1624b61a825 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-height.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-height.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x38]
       PaintableWithLines (BlockContainer<DIV>.hmm) [8,8 784x38]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x54] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-width-with-max-content-containing-block-width.txt b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-width-with-max-content-containing-block-width.txt
index a5b6080523a..f4f0110a29e 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-width-with-max-content-containing-block-width.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-min-width-with-max-content-containing-block-width.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 200x18]
       PaintableWithLines (BlockContainer<DIV>) [8,8 200x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-padding-on-inline-block-with-indefinite-containing-block-size.txt b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-padding-on-inline-block-with-indefinite-containing-block-size.txt
index 5c10c609b51..7061e5fbee8 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/percentage-padding-on-inline-block-with-indefinite-containing-block-size.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/percentage-padding-on-inline-block-with-indefinite-containing-block-size.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 0x18]
       PaintableWithLines (BlockContainer<DIV>) [8,21 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/relpos-block.txt b/Tests/LibWeb/Layout/expected/block-and-inline/relpos-block.txt
index 01e13ec7129..322a0c63783 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/relpos-block.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/relpos-block.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.athena) [22,24 204x22]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [2,2 796x64] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/relpos-float.txt b/Tests/LibWeb/Layout/expected/block-and-inline/relpos-float.txt
index 3816acb0ceb..24c9aecb3e1 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/relpos-float.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/relpos-float.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.athena) [16,16 204x22]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [2,2 796x32] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/relpos-inline-element-js-offsets.txt b/Tests/LibWeb/Layout/expected/block-and-inline/relpos-inline-element-js-offsets.txt
index 5079e3d0924..ccfff08d6c4 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/relpos-inline-element-js-offsets.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/relpos-inline-element-js-offsets.txt
@@ -48,3 +48,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<PRE>#out) [8,111 784x45]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,169 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x169] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/relpos-inline-elements.txt b/Tests/LibWeb/Layout/expected/block-and-inline/relpos-inline-elements.txt
index 9d9a2880f0c..1d16349248b 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/relpos-inline-elements.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/relpos-inline-elements.txt
@@ -28,3 +28,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (InlineNode<B>) [53.796875,58 27.203125x18]
         PaintableWithLines (InlineNode<I>) [53.796875,58 27.203125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/single-br-inline-layout.txt b/Tests/LibWeb/Layout/expected/block-and-inline/single-br-inline-layout.txt
index 422a3aab5a3..ea7417db3dd 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/single-br-inline-layout.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/single-br-inline-layout.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#begin) [8,8 784x2]
       PaintableWithLines (BlockContainer(anonymous)) [8,10 784x18]
       PaintableWithLines (BlockContainer<DIV>#end) [8,28 784x2]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/small-percentage-margin.txt b/Tests/LibWeb/Layout/expected/block-and-inline/small-percentage-margin.txt
index 6633fca1a53..a767f3596ee 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/small-percentage-margin.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/small-percentage-margin.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>) [407.796875,108 376.3125x100]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x208] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-and-inline/width-auto-margins-set-zero-if-containing-size-smaller.txt b/Tests/LibWeb/Layout/expected/block-and-inline/width-auto-margins-set-zero-if-containing-size-smaller.txt
index 78f48ec388e..b4547089696 100644
--- a/Tests/LibWeb/Layout/expected/block-and-inline/width-auto-margins-set-zero-if-containing-size-smaller.txt
+++ b/Tests/LibWeb/Layout/expected/block-and-inline/width-auto-margins-set-zero-if-containing-size-smaller.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#container) [10,10 102x58] overflow: [11,11 172x56]
         PaintableWithLines (BlockContainer<DIV>#child) [11,11 172x56]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/block-size.txt b/Tests/LibWeb/Layout/expected/block-size.txt
index 6ca508c898e..d81c27e3a84 100644
--- a/Tests/LibWeb/Layout/expected/block-size.txt
+++ b/Tests/LibWeb/Layout/expected/block-size.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x1780]
       PaintableWithLines (BlockContainer<P>.block-size-test) [8,1310 200x400]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,1780 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x1780] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/blockify-layout-internal-box-without-crashing.txt b/Tests/LibWeb/Layout/expected/blockify-layout-internal-box-without-crashing.txt
index e0c6559f28e..d918855d0df 100644
--- a/Tests/LibWeb/Layout/expected/blockify-layout-internal-box-without-crashing.txt
+++ b/Tests/LibWeb/Layout/expected/blockify-layout-internal-box-without-crashing.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableBox (Box<TR>) [10,10 0x0]
               PaintableWithLines (BlockContainer(anonymous)) [10,10 0x0]
                 PaintableWithLines (BlockContainer<TD>) [10,10 2x2]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x20] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/border-radius-invalid-corner-sampling-config.txt b/Tests/LibWeb/Layout/expected/border-radius-invalid-corner-sampling-config.txt
index 41f52625a81..6e648820d33 100644
--- a/Tests/LibWeb/Layout/expected/border-radius-invalid-corner-sampling-config.txt
+++ b/Tests/LibWeb/Layout/expected/border-radius-invalid-corner-sampling-config.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/border-spacing-calc-dont-crash.txt b/Tests/LibWeb/Layout/expected/border-spacing-calc-dont-crash.txt
index 50833160f2d..0d26d878486 100644
--- a/Tests/LibWeb/Layout/expected/border-spacing-calc-dont-crash.txt
+++ b/Tests/LibWeb/Layout/expected/border-spacing-calc-dont-crash.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/box-sizing-border-box-for-definite-sizes-without-layout.txt b/Tests/LibWeb/Layout/expected/box-sizing-border-box-for-definite-sizes-without-layout.txt
index f0a89e68d03..3be144c1b5a 100644
--- a/Tests/LibWeb/Layout/expected/box-sizing-border-box-for-definite-sizes-without-layout.txt
+++ b/Tests/LibWeb/Layout/expected/box-sizing-border-box-for-definite-sizes-without-layout.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.button) [8,8 89.75x40]
         PaintableWithLines (BlockContainer(anonymous)) [28,16.5 49.75x23]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x56] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/br-should-not-generate-pseudo-before.txt b/Tests/LibWeb/Layout/expected/br-should-not-generate-pseudo-before.txt
index c5cdfefc569..dc61faf1bdc 100644
--- a/Tests/LibWeb/Layout/expected/br-should-not-generate-pseudo-before.txt
+++ b/Tests/LibWeb/Layout/expected/br-should-not-generate-pseudo-before.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,50 784x36]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x94] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/button-with-before-and-after-pseudo-elements.txt b/Tests/LibWeb/Layout/expected/button-with-before-and-after-pseudo-elements.txt
index 26156c8f0ec..585f638e3a6 100644
--- a/Tests/LibWeb/Layout/expected/button-with-before-and-after-pseudo-elements.txt
+++ b/Tests/LibWeb/Layout/expected/button-with-before-and-after-pseudo-elements.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
             PaintableWithLines (InlineNode(anonymous)) [67.796875,10 27.203125x18]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/calc-font-size-with-percentages.txt b/Tests/LibWeb/Layout/expected/calc-font-size-with-percentages.txt
index ed1483d1fe8..d274c811cb3 100644
--- a/Tests/LibWeb/Layout/expected/calc-font-size-with-percentages.txt
+++ b/Tests/LibWeb/Layout/expected/calc-font-size-with-percentages.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x110]
       PaintableWithLines (BlockContainer<DIV>.test) [8,8 784x110]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x126] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/calc-negate-length.txt b/Tests/LibWeb/Layout/expected/calc-negate-length.txt
index 3ce8cccbfba..dd23af96562 100644
--- a/Tests/LibWeb/Layout/expected/calc-negate-length.txt
+++ b/Tests/LibWeb/Layout/expected/calc-negate-length.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x50]
       PaintableWithLines (BlockContainer<DIV>.container) [8,8 100x50]
         PaintableWithLines (BlockContainer<DIV>.foo) [8,8 99x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/calc-negative-border-width.txt b/Tests/LibWeb/Layout/expected/calc-negative-border-width.txt
index 4ac3f572a54..dede8003986 100644
--- a/Tests/LibWeb/Layout/expected/calc-negative-border-width.txt
+++ b/Tests/LibWeb/Layout/expected/calc-negative-border-width.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/calc-with-fr.txt b/Tests/LibWeb/Layout/expected/calc-with-fr.txt
index 3c6ba2bbb1b..6b593df9040 100644
--- a/Tests/LibWeb/Layout/expected/calc-with-fr.txt
+++ b/Tests/LibWeb/Layout/expected/calc-with-fr.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [8,44 784x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/child-of-abspos-percentage-height.txt b/Tests/LibWeb/Layout/expected/child-of-abspos-percentage-height.txt
index 42c4e41ec29..bc332437e80 100644
--- a/Tests/LibWeb/Layout/expected/child-of-abspos-percentage-height.txt
+++ b/Tests/LibWeb/Layout/expected/child-of-abspos-percentage-height.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 36.84375x18]
       PaintableWithLines (BlockContainer<DIV>) [8,8 36.84375x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/crash-tests/html-with-only-a-template-tag.txt b/Tests/LibWeb/Layout/expected/crash-tests/html-with-only-a-template-tag.txt
index ac8ed6ccee5..a1f49136cdb 100644
--- a/Tests/LibWeb/Layout/expected/crash-tests/html-with-only-a-template-tag.txt
+++ b/Tests/LibWeb/Layout/expected/crash-tests/html-with-only-a-template-tag.txt
@@ -5,3 +5,6 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-all-unset.txt b/Tests/LibWeb/Layout/expected/css-all-unset.txt
index 5830f5c8c5a..1235782f0d7 100644
--- a/Tests/LibWeb/Layout/expected/css-all-unset.txt
+++ b/Tests/LibWeb/Layout/expected/css-all-unset.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
     PaintableWithLines (InlineNode<BODY>) [134.984375,0 103.140625x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-appearance-none.txt b/Tests/LibWeb/Layout/expected/css-appearance-none.txt
index ce8d98e785f..4d89556c31f 100644
--- a/Tests/LibWeb/Layout/expected/css-appearance-none.txt
+++ b/Tests/LibWeb/Layout/expected/css-appearance-none.txt
@@ -75,3 +75,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<INPUT>) [8,119 0x0]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x132] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-attr-typed-fallback.txt b/Tests/LibWeb/Layout/expected/css-attr-typed-fallback.txt
index 029a36e9cb6..ec54e5d06b8 100644
--- a/Tests/LibWeb/Layout/expected/css-attr-typed-fallback.txt
+++ b/Tests/LibWeb/Layout/expected/css-attr-typed-fallback.txt
@@ -43,3 +43,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,118 784x0]
       PaintableWithLines (BlockContainer<DIV>.color) [8,118 102x22]
       PaintableWithLines (BlockContainer(anonymous)) [8,140 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x148] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-calc-border-width.txt b/Tests/LibWeb/Layout/expected/css-calc-border-width.txt
index ab7738af82e..fa6a28b104f 100644
--- a/Tests/LibWeb/Layout/expected/css-calc-border-width.txt
+++ b/Tests/LibWeb/Layout/expected/css-calc-border-width.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x136]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x120]
       PaintableWithLines (BlockContainer<DIV>) [8,8 120x120]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-content-visibility.txt b/Tests/LibWeb/Layout/expected/css-content-visibility.txt
index 088fb3879d0..dd3a549f1e7 100644
--- a/Tests/LibWeb/Layout/expected/css-content-visibility.txt
+++ b/Tests/LibWeb/Layout/expected/css-content-visibility.txt
@@ -6,4 +6,7 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x48]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x32]
-      PaintableWithLines (BlockContainer<DIV>) [8,8 784x32]
\ No newline at end of file
+      PaintableWithLines (BlockContainer<DIV>) [8,8 784x32]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x48] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-counters/basic.txt b/Tests/LibWeb/Layout/expected/css-counters/basic.txt
index 0d579505830..3aa1a78a204 100644
--- a/Tests/LibWeb/Layout/expected/css-counters/basic.txt
+++ b/Tests/LibWeb/Layout/expected/css-counters/basic.txt
@@ -132,3 +132,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,356 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x356] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-counters/counters-function-single-argument.txt b/Tests/LibWeb/Layout/expected/css-counters/counters-function-single-argument.txt
index cb891ea1348..fdb56f961ee 100644
--- a/Tests/LibWeb/Layout/expected/css-counters/counters-function-single-argument.txt
+++ b/Tests/LibWeb/Layout/expected/css-counters/counters-function-single-argument.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-counters/counters-function.txt b/Tests/LibWeb/Layout/expected/css-counters/counters-function.txt
index 66c20d7fa92..d8aaf780e5a 100644
--- a/Tests/LibWeb/Layout/expected/css-counters/counters-function.txt
+++ b/Tests/LibWeb/Layout/expected/css-counters/counters-function.txt
@@ -252,3 +252,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [24,278 768x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,278 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x286] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-counters/hidden-elements.txt b/Tests/LibWeb/Layout/expected/css-counters/hidden-elements.txt
index fbda0fec8a7..672510c771a 100644
--- a/Tests/LibWeb/Layout/expected/css-counters/hidden-elements.txt
+++ b/Tests/LibWeb/Layout/expected/css-counters/hidden-elements.txt
@@ -65,3 +65,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (InlineNode(anonymous)) [8,152 20.234375x18]
           TextPaintable (TextNode<#text>)
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x186] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-degenerate-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/css-degenerate-aspect-ratio.txt
index 4b3567468e0..55b180d3767 100644
--- a/Tests/LibWeb/Layout/expected/css-degenerate-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/css-degenerate-aspect-ratio.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-dir-selector.txt b/Tests/LibWeb/Layout/expected/css-dir-selector.txt
index 2917d25d508..1762026aafc 100644
--- a/Tests/LibWeb/Layout/expected/css-dir-selector.txt
+++ b/Tests/LibWeb/Layout/expected/css-dir-selector.txt
@@ -93,3 +93,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x832]
       PaintableWithLines (BlockContainer<DIV>) [400,722 102x102]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [200,824 592x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [100,0 700x832] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-ex-unit.txt b/Tests/LibWeb/Layout/expected/css-ex-unit.txt
index 8e61ddb875d..527ab7c5179 100644
--- a/Tests/LibWeb/Layout/expected/css-ex-unit.txt
+++ b/Tests/LibWeb/Layout/expected/css-ex-unit.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x177.25]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x161.25]
       PaintableWithLines (BlockContainer<DIV>) [8,8 107.5x161.25]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x177.25] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-font-size-calc.txt b/Tests/LibWeb/Layout/expected/css-font-size-calc.txt
index 1a8d1660c1c..5833b63a3db 100644
--- a/Tests/LibWeb/Layout/expected/css-font-size-calc.txt
+++ b/Tests/LibWeb/Layout/expected/css-font-size-calc.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x131]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x115]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x131] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-font-size-math.txt b/Tests/LibWeb/Layout/expected/css-font-size-math.txt
index ba6bf38a7d2..bb0cad4bab1 100644
--- a/Tests/LibWeb/Layout/expected/css-font-size-math.txt
+++ b/Tests/LibWeb/Layout/expected/css-font-size-math.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               TextPaintable (TextNode<#text>)
               PaintableWithLines (InlineNode<SPAN>) [78.53125,59 8.40625x15]
                 TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x99] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-host-selector-gets-parsed.txt b/Tests/LibWeb/Layout/expected/css-host-selector-gets-parsed.txt
index 49e0643f282..217304283cd 100644
--- a/Tests/LibWeb/Layout/expected/css-host-selector-gets-parsed.txt
+++ b/Tests/LibWeb/Layout/expected/css-host-selector-gets-parsed.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableWithLines (BlockContainer<DIV>) [8,8 100x100]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-import-rule.txt b/Tests/LibWeb/Layout/expected/css-import-rule.txt
index 8c65f636695..f1f8a3b09ba 100644
--- a/Tests/LibWeb/Layout/expected/css-import-rule.txt
+++ b/Tests/LibWeb/Layout/expected/css-import-rule.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x73]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x57]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x73] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-imported-sheet-with-media-rule.txt b/Tests/LibWeb/Layout/expected/css-imported-sheet-with-media-rule.txt
index f05b611a882..480ba965194 100644
--- a/Tests/LibWeb/Layout/expected/css-imported-sheet-with-media-rule.txt
+++ b/Tests/LibWeb/Layout/expected/css-imported-sheet-with-media-rule.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x131]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x115]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x131] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-invalid-psuedo-compound-selector.txt b/Tests/LibWeb/Layout/expected/css-invalid-psuedo-compound-selector.txt
index 7bf0b5ed9e7..cbacb109d9c 100644
--- a/Tests/LibWeb/Layout/expected/css-invalid-psuedo-compound-selector.txt
+++ b/Tests/LibWeb/Layout/expected/css-invalid-psuedo-compound-selector.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-line-height-percentage-inheritance.txt b/Tests/LibWeb/Layout/expected/css-line-height-percentage-inheritance.txt
index e250af056aa..49a188fe6f7 100644
--- a/Tests/LibWeb/Layout/expected/css-line-height-percentage-inheritance.txt
+++ b/Tests/LibWeb/Layout/expected/css-line-height-percentage-inheritance.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x36]
       PaintableWithLines (BlockContainer<DIV>) [10,10 780x34]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-line-height-zero.txt b/Tests/LibWeb/Layout/expected/css-line-height-zero.txt
index c26fa7652d2..317eff8dc83 100644
--- a/Tests/LibWeb/Layout/expected/css-line-height-zero.txt
+++ b/Tests/LibWeb/Layout/expected/css-line-height-zero.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>) [11,50 196x24]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,76 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x84] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-logical-inset-properties.txt b/Tests/LibWeb/Layout/expected/css-logical-inset-properties.txt
index 0c938288302..a9550c2a519 100644
--- a/Tests/LibWeb/Layout/expected/css-logical-inset-properties.txt
+++ b/Tests/LibWeb/Layout/expected/css-logical-inset-properties.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 502x402]
       PaintableWithLines (BlockContainer<DIV>.two-props) [59,109 400x200]
       PaintableWithLines (BlockContainer<DIV>.four-props) [109,209 250x150]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-namespace-rule-matches.txt b/Tests/LibWeb/Layout/expected/css-namespace-rule-matches.txt
index f555903ddc0..f727b746d3d 100644
--- a/Tests/LibWeb/Layout/expected/css-namespace-rule-matches.txt
+++ b/Tests/LibWeb/Layout/expected/css-namespace-rule-matches.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (InlineNode<A>) [8,10 183.9375x43]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,63 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x63] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-namespace-rule-no-match.txt b/Tests/LibWeb/Layout/expected/css-namespace-rule-no-match.txt
index 3f4925220ab..6a5d1cabe50 100644
--- a/Tests/LibWeb/Layout/expected/css-namespace-rule-no-match.txt
+++ b/Tests/LibWeb/Layout/expected/css-namespace-rule-no-match.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (InlineNode<A>) [8,15 151.390625x33]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,63 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x63] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-namespace-tag-name-selector.txt b/Tests/LibWeb/Layout/expected/css-namespace-tag-name-selector.txt
index b00736ad854..848d1ebb4f7 100644
--- a/Tests/LibWeb/Layout/expected/css-namespace-tag-name-selector.txt
+++ b/Tests/LibWeb/Layout/expected/css-namespace-tag-name-selector.txt
@@ -40,3 +40,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (InlineNode<A>) [9,234 101.484375x48]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,282 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x290] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-namespace-universal-selector.txt b/Tests/LibWeb/Layout/expected/css-namespace-universal-selector.txt
index c190c73be91..559c6acfbfc 100644
--- a/Tests/LibWeb/Layout/expected/css-namespace-universal-selector.txt
+++ b/Tests/LibWeb/Layout/expected/css-namespace-universal-selector.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,230 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,230 102x102]
       PaintableWithLines (BlockContainer(anonymous)) [8,332 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x340] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-pseudo-element-blockification.txt b/Tests/LibWeb/Layout/expected/css-pseudo-element-blockification.txt
index 308aff3aa65..647f59da4ce 100644
--- a/Tests/LibWeb/Layout/expected/css-pseudo-element-blockification.txt
+++ b/Tests/LibWeb/Layout/expected/css-pseudo-element-blockification.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [93.25,8 55.359375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-pseudo-element-display-list-item.txt b/Tests/LibWeb/Layout/expected/css-pseudo-element-display-list-item.txt
index 90f9738b0d7..92e3e064d7e 100644
--- a/Tests/LibWeb/Layout/expected/css-pseudo-element-display-list-item.txt
+++ b/Tests/LibWeb/Layout/expected/css-pseudo-element-display-list-item.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           MarkerPaintable (ListItemMarkerBox(anonymous)) [0,26.5 12x17]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-pseudo-element-should-not-be-affected-by-inline-style.txt b/Tests/LibWeb/Layout/expected/css-pseudo-element-should-not-be-affected-by-inline-style.txt
index 69430a71330..79169730cc4 100644
--- a/Tests/LibWeb/Layout/expected/css-pseudo-element-should-not-be-affected-by-inline-style.txt
+++ b/Tests/LibWeb/Layout/expected/css-pseudo-element-should-not-be-affected-by-inline-style.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.outer) [10,10 102x102]
         PaintableWithLines (BlockContainer(anonymous)) [11,11 52x52]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,63 100x2]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-pseudo-element-should-not-be-affected-by-presentational-hints.txt b/Tests/LibWeb/Layout/expected/css-pseudo-element-should-not-be-affected-by-presentational-hints.txt
index 8f2783abf83..8d8a45b35bd 100644
--- a/Tests/LibWeb/Layout/expected/css-pseudo-element-should-not-be-affected-by-presentational-hints.txt
+++ b/Tests/LibWeb/Layout/expected/css-pseudo-element-should-not-be-affected-by-presentational-hints.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableBox (Box<TR>) [13,13 104x100]
               PaintableWithLines (BlockContainer<TD>) [13,13 104x100]
                 PaintableWithLines (BlockContainer(anonymous)) [15,62 100x2]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x124] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-quotes-nesting.txt b/Tests/LibWeb/Layout/expected/css-quotes-nesting.txt
index 65ad68b7c4a..a1f9bb44fed 100644
--- a/Tests/LibWeb/Layout/expected/css-quotes-nesting.txt
+++ b/Tests/LibWeb/Layout/expected/css-quotes-nesting.txt
@@ -298,3 +298,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (InlineNode(anonymous)) [143.421875,44 4.8125x18]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,62 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-rect-value-with-calc-dont-crash.txt b/Tests/LibWeb/Layout/expected/css-rect-value-with-calc-dont-crash.txt
index 50833160f2d..0d26d878486 100644
--- a/Tests/LibWeb/Layout/expected/css-rect-value-with-calc-dont-crash.txt
+++ b/Tests/LibWeb/Layout/expected/css-rect-value-with-calc-dont-crash.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-revert.txt b/Tests/LibWeb/Layout/expected/css-revert.txt
index b2201394296..dcabe9f439a 100644
--- a/Tests/LibWeb/Layout/expected/css-revert.txt
+++ b/Tests/LibWeb/Layout/expected/css-revert.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x18]
     PaintableWithLines (BlockContainer<BODY>) [0,0 800x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-round-function-with-percentage-value.txt b/Tests/LibWeb/Layout/expected/css-round-function-with-percentage-value.txt
index 19b5b70e054..22b3f24e864 100644
--- a/Tests/LibWeb/Layout/expected/css-round-function-with-percentage-value.txt
+++ b/Tests/LibWeb/Layout/expected/css-round-function-with-percentage-value.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.wrapper) [8,8 200x18]
         PaintableWithLines (BlockContainer<DIV>.box) [8,8 140x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-snap-a-length-as-a-border-width.txt b/Tests/LibWeb/Layout/expected/css-snap-a-length-as-a-border-width.txt
index 4a847ba621b..09661f76a94 100644
--- a/Tests/LibWeb/Layout/expected/css-snap-a-length-as-a-border-width.txt
+++ b/Tests/LibWeb/Layout/expected/css-snap-a-length-as-a-border-width.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x204]
       PaintableWithLines (BlockContainer<DIV>.a) [8,8 102x102]
       PaintableWithLines (BlockContainer<DIV>.b) [8,110 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-table-cell-verticalalign-text-top.txt b/Tests/LibWeb/Layout/expected/css-table-cell-verticalalign-text-top.txt
index abd1aa7f8e0..49510879f3f 100644
--- a/Tests/LibWeb/Layout/expected/css-table-cell-verticalalign-text-top.txt
+++ b/Tests/LibWeb/Layout/expected/css-table-cell-verticalalign-text-top.txt
@@ -38,3 +38,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [10,10 200x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,108 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-text-transform-math-auto.txt b/Tests/LibWeb/Layout/expected/css-text-transform-math-auto.txt
index 8a558500dee..6a4fa01b8fe 100644
--- a/Tests/LibWeb/Layout/expected/css-text-transform-math-auto.txt
+++ b/Tests/LibWeb/Layout/expected/css-text-transform-math-auto.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<P>) [8,16 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,50 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x50] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-transition-none.txt b/Tests/LibWeb/Layout/expected/css-transition-none.txt
index 50833160f2d..0d26d878486 100644
--- a/Tests/LibWeb/Layout/expected/css-transition-none.txt
+++ b/Tests/LibWeb/Layout/expected/css-transition-none.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-values/calc-min-with-percentage.txt b/Tests/LibWeb/Layout/expected/css-values/calc-min-with-percentage.txt
index 096c0870d53..f190de69bb5 100644
--- a/Tests/LibWeb/Layout/expected/css-values/calc-min-with-percentage.txt
+++ b/Tests/LibWeb/Layout/expected/css-values/calc-min-with-percentage.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x116]
     PaintableWithLines (BlockContainer<BODY>) [8,8 500x100]
       PaintableWithLines (BlockContainer<DIV>) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-values/comparison-functions.txt b/Tests/LibWeb/Layout/expected/css-values/comparison-functions.txt
index 4f9a64cfe61..2e1945bf3eb 100644
--- a/Tests/LibWeb/Layout/expected/css-values/comparison-functions.txt
+++ b/Tests/LibWeb/Layout/expected/css-values/comparison-functions.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.min) [8,8 80x0]
         PaintableWithLines (BlockContainer<DIV>.max) [8,8 100x0] overflow: [8,8 120x300]
           PaintableWithLines (BlockContainer<DIV>.clamp) [8,8 120x300]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 0x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-values/exponential-functions.txt b/Tests/LibWeb/Layout/expected/css-values/exponential-functions.txt
index 402755d1ca5..c19dbccb51a 100644
--- a/Tests/LibWeb/Layout/expected/css-values/exponential-functions.txt
+++ b/Tests/LibWeb/Layout/expected/css-values/exponential-functions.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>.hypot) [8,8 120x0]
             PaintableWithLines (BlockContainer<DIV>.log) [8,8 140x0]
               PaintableWithLines (BlockContainer<DIV>.exp) [8,8 160x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 0x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-values/numeric-constants.txt b/Tests/LibWeb/Layout/expected/css-values/numeric-constants.txt
index f171283c033..698f2b76fc2 100644
--- a/Tests/LibWeb/Layout/expected/css-values/numeric-constants.txt
+++ b/Tests/LibWeb/Layout/expected/css-values/numeric-constants.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 0x0]
       PaintableWithLines (BlockContainer<DIV>.pi) [8,8 80x0]
         PaintableWithLines (BlockContainer<DIV>.e) [8,8 100x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 0x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-values/rect-non-token-contents-crash.txt b/Tests/LibWeb/Layout/expected/css-values/rect-non-token-contents-crash.txt
index c921381db9c..a14aa922885 100644
--- a/Tests/LibWeb/Layout/expected/css-values/rect-non-token-contents-crash.txt
+++ b/Tests/LibWeb/Layout/expected/css-values/rect-non-token-contents-crash.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,16 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-values/sign-related-functions.txt b/Tests/LibWeb/Layout/expected/css-values/sign-related-functions.txt
index 60a8d3beb51..b5df09ec45a 100644
--- a/Tests/LibWeb/Layout/expected/css-values/sign-related-functions.txt
+++ b/Tests/LibWeb/Layout/expected/css-values/sign-related-functions.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 0x0]
       PaintableWithLines (BlockContainer<DIV>.abs) [8,8 80x0]
         PaintableWithLines (BlockContainer<DIV>.sign) [8,8 100x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 0x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-values/stepped-value-functions.txt b/Tests/LibWeb/Layout/expected/css-values/stepped-value-functions.txt
index be91806e307..9f79d4caf87 100644
--- a/Tests/LibWeb/Layout/expected/css-values/stepped-value-functions.txt
+++ b/Tests/LibWeb/Layout/expected/css-values/stepped-value-functions.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.round) [8,8 80x0]
         PaintableWithLines (BlockContainer<DIV>.mod) [8,8 100x0]
           PaintableWithLines (BlockContainer<DIV>.rem) [8,8 120x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 0x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css-values/trigonometric-functions.txt b/Tests/LibWeb/Layout/expected/css-values/trigonometric-functions.txt
index ee80b36c64d..4f57923e684 100644
--- a/Tests/LibWeb/Layout/expected/css-values/trigonometric-functions.txt
+++ b/Tests/LibWeb/Layout/expected/css-values/trigonometric-functions.txt
@@ -22,3 +22,13 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x996]
       PaintableWithLines (BlockContainer<DIV>.atan) [8,608 100x180]
       PaintableWithLines (BlockContainer<DIV>.atan2) [8,788 100x200]
       PaintableWithLines (BlockContainer(anonymous)) [8,988 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x996] [children: 7] (z-index: auto)
+  SC for BlockContainer<DIV>.sin [8,8 80x100] [children: 0] (z-index: auto), transform: [-4.371139e-8 1 -1 -4.371139e-8 0 0]
+  SC for BlockContainer<DIV>.cos [8,108 100x100] [children: 0] (z-index: auto), transform: [-4.371139e-8 1 -1 -4.371139e-8 0 0]
+  SC for BlockContainer<DIV>.tan [8,208 120x100] [children: 0] (z-index: auto), transform: [-4.371139e-8 1 -1 -4.371139e-8 0 0]
+  SC for BlockContainer<DIV>.asin [8,308 100x140] [children: 0] (z-index: auto), transform: [-4.371139e-8 1 -1 -4.371139e-8 0 0]
+  SC for BlockContainer<DIV>.acos [8,448 100x160] [children: 0] (z-index: auto), transform: [-4.371139e-8 1 -1 -4.371139e-8 0 0]
+  SC for BlockContainer<DIV>.atan [8,608 100x180] [children: 0] (z-index: auto), transform: [-4.371139e-8 1 -1 -4.371139e-8 0 0]
+  SC for BlockContainer<DIV>.atan2 [8,788 100x200] [children: 0] (z-index: auto), transform: [-4.371139e-8 1 -1 -4.371139e-8 0 0]
diff --git a/Tests/LibWeb/Layout/expected/css-var-in-calc-block.txt b/Tests/LibWeb/Layout/expected/css-var-in-calc-block.txt
index f37c32c3eff..d20bb6b2d06 100644
--- a/Tests/LibWeb/Layout/expected/css-var-in-calc-block.txt
+++ b/Tests/LibWeb/Layout/expected/css-var-in-calc-block.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x272]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x254]
       PaintableWithLines (BlockContainer<DIV>) [10,10 252x252]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x270] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/css/counters-on-pseudo-elements.txt b/Tests/LibWeb/Layout/expected/css/counters-on-pseudo-elements.txt
index 5dc1512c5d4..0ae40c79a67 100644
--- a/Tests/LibWeb/Layout/expected/css/counters-on-pseudo-elements.txt
+++ b/Tests/LibWeb/Layout/expected/css/counters-on-pseudo-elements.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,62 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/details-closed.txt b/Tests/LibWeb/Layout/expected/details-closed.txt
index f4f251c8cb9..94ce24ad895 100644
--- a/Tests/LibWeb/Layout/expected/details-closed.txt
+++ b/Tests/LibWeb/Layout/expected/details-closed.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<SLOT>) [8,26 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/details-open.txt b/Tests/LibWeb/Layout/expected/details-open.txt
index a5dfc6bf2d6..ae96a180ac9 100644
--- a/Tests/LibWeb/Layout/expected/details-open.txt
+++ b/Tests/LibWeb/Layout/expected/details-open.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (InlineNode<SPAN>) [8,26 82.3125x18]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/details-summary-default-ua-style.txt b/Tests/LibWeb/Layout/expected/details-summary-default-ua-style.txt
index 0f3a91d8d9d..41c76871469 100644
--- a/Tests/LibWeb/Layout/expected/details-summary-default-ua-style.txt
+++ b/Tests/LibWeb/Layout/expected/details-summary-default-ua-style.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           MarkerPaintable (ListItemMarkerBox(anonymous)) [68,68.5 12x17]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<SLOT>) [68,86 664x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x154] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/dialog-open-modal.txt b/Tests/LibWeb/Layout/expected/dialog-open-modal.txt
index e0c7c2cf190..83c0f7ecd88 100644
--- a/Tests/LibWeb/Layout/expected/dialog-open-modal.txt
+++ b/Tests/LibWeb/Layout/expected/dialog-open-modal.txt
@@ -20,3 +20,8 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableBox (Box<DIALOG>#modal) [339.84375,272 120.3125x56]
     PaintableWithLines (BlockContainer<SPAN>) [358.84375,291 82.3125x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 3] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
+ SC for BlockContainer(anonymous) [0,0 800x600] [children: 0] (z-index: auto)
+ SC for Box<DIALOG>#modal [358.84375,291 82.3125x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/dialog-open-non-modal.txt b/Tests/LibWeb/Layout/expected/dialog-open-non-modal.txt
index ab22fe9b6b3..3a89f2b8099 100644
--- a/Tests/LibWeb/Layout/expected/dialog-open-non-modal.txt
+++ b/Tests/LibWeb/Layout/expected/dialog-open-non-modal.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIALOG>) [339.84375,8 120.3125x56]
         PaintableWithLines (InlineNode<SPAN>) [358.84375,27 82.3125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/display-contents-with-in-children.txt b/Tests/LibWeb/Layout/expected/display-contents-with-in-children.txt
index 7cd3b99494d..9504a9c2e11 100644
--- a/Tests/LibWeb/Layout/expected/display-contents-with-in-children.txt
+++ b/Tests/LibWeb/Layout/expected/display-contents-with-in-children.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x18]
     PaintableWithLines (InlineNode<SPAN>) [0,0 51.75x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/display-table-column-crash.txt b/Tests/LibWeb/Layout/expected/display-table-column-crash.txt
index 4fa53bf3c81..9c5653acce7 100644
--- a/Tests/LibWeb/Layout/expected/display-table-column-crash.txt
+++ b/Tests/LibWeb/Layout/expected/display-table-column-crash.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,8 784x0]
       PaintableWithLines (TableWrapper(anonymous)) [8,8 0x0]
         PaintableBox (Box(anonymous)) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/display-table-inline-children.txt b/Tests/LibWeb/Layout/expected/display-table-inline-children.txt
index 115272bd352..ce344560b8b 100644
--- a/Tests/LibWeb/Layout/expected/display-table-inline-children.txt
+++ b/Tests/LibWeb/Layout/expected/display-table-inline-children.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 1208x616]
               PaintableWithLines (InlineNode<A>) [8,8 1200x600]
                 ImagePaintable (ImageBox<IMG>) [8,8 1200x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,608 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x616] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/div_align.txt b/Tests/LibWeb/Layout/expected/div_align.txt
index 25dc679674b..5ef481d2dfa 100644
--- a/Tests/LibWeb/Layout/expected/div_align.txt
+++ b/Tests/LibWeb/Layout/expected/div_align.txt
@@ -107,3 +107,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x640]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.square) [28,520 100x100]
       PaintableWithLines (BlockContainer(anonymous)) [8,640 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x640] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/div_align_nested.txt b/Tests/LibWeb/Layout/expected/div_align_nested.txt
index 4df28e5212c..ec94695231e 100644
--- a/Tests/LibWeb/Layout/expected/div_align_nested.txt
+++ b/Tests/LibWeb/Layout/expected/div_align_nested.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>.square) [8,162 100x100]
           PaintableWithLines (BlockContainer(anonymous)) [8,262 784x0]
         PaintableWithLines (BlockContainer(anonymous)) [8,262 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x270] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/document-write-incomplete-tag.txt b/Tests/LibWeb/Layout/expected/document-write-incomplete-tag.txt
index 4f3744fc77b..4ed408e837a 100644
--- a/Tests/LibWeb/Layout/expected/document-write-incomplete-tag.txt
+++ b/Tests/LibWeb/Layout/expected/document-write-incomplete-tag.txt
@@ -32,3 +32,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<P>) [8,84 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,118 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/dont-crash-on-relayout-that-rewraps-text.txt b/Tests/LibWeb/Layout/expected/dont-crash-on-relayout-that-rewraps-text.txt
index bc2d448017e..5410ddd1d8e 100644
--- a/Tests/LibWeb/Layout/expected/dont-crash-on-relayout-that-rewraps-text.txt
+++ b/Tests/LibWeb/Layout/expected/dont-crash-on-relayout-that-rewraps-text.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>) [10,30 138.265625x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x58] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/element-use-pseudo-element.txt b/Tests/LibWeb/Layout/expected/element-use-pseudo-element.txt
index 48de543eab4..c2a355f0619 100644
--- a/Tests/LibWeb/Layout/expected/element-use-pseudo-element.txt
+++ b/Tests/LibWeb/Layout/expected/element-use-pseudo-element.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<PROGRESS>#a) [8,13 300x12] overflow: [8,13 300x14]
         PaintableWithLines (BlockContainer<DIV>) [8,13 300x14]
           PaintableWithLines (BlockContainer<DIV>) [9,14 298x12]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x39] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/empty-image-should-be-zero-sized.txt b/Tests/LibWeb/Layout/expected/empty-image-should-be-zero-sized.txt
index d272c8eacca..56d70171545 100644
--- a/Tests/LibWeb/Layout/expected/empty-image-should-be-zero-sized.txt
+++ b/Tests/LibWeb/Layout/expected/empty-image-should-be-zero-sized.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       ImagePaintable (ImageBox<IMG>) [8,21 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/fieldset-with-rendered-legend.txt b/Tests/LibWeb/Layout/expected/fieldset-with-rendered-legend.txt
index c78569636d5..64d06917acd 100644
--- a/Tests/LibWeb/Layout/expected/fieldset-with-rendered-legend.txt
+++ b/Tests/LibWeb/Layout/expected/fieldset-with-rendered-legend.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (LegendBox<LEGEND>) [24,1 40.328125x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,31 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x39] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-abspos-item-with-preceding-whitespace.txt b/Tests/LibWeb/Layout/expected/flex-abspos-item-with-preceding-whitespace.txt
index f53ea9f9086..314603af75a 100644
--- a/Tests/LibWeb/Layout/expected/flex-abspos-item-with-preceding-whitespace.txt
+++ b/Tests/LibWeb/Layout/expected/flex-abspos-item-with-preceding-whitespace.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,-22 800x622]
     PaintableWithLines (BlockContainer<BODY>) [18,18 764x40]
       PaintableBox (Box<DIV>.pink) [28,28 744x20]
         PaintableWithLines (BlockContainer<DIV>.orange) [38,-22 120x120]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [10,10 780x56] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-auto.txt b/Tests/LibWeb/Layout/expected/flex-auto.txt
index 5dc16b2a7a0..8c3ed535a18 100644
--- a/Tests/LibWeb/Layout/expected/flex-auto.txt
+++ b/Tests/LibWeb/Layout/expected/flex-auto.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [342.34375,9 166.671875x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-column-constained-wrap.txt b/Tests/LibWeb/Layout/expected/flex-column-constained-wrap.txt
index a67d9ecf9be..c1ddbb0e656 100644
--- a/Tests/LibWeb/Layout/expected/flex-column-constained-wrap.txt
+++ b/Tests/LibWeb/Layout/expected/flex-column-constained-wrap.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [134,9 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,260 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x268] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-column-constrained-nowrap.txt b/Tests/LibWeb/Layout/expected/flex-column-constrained-nowrap.txt
index 89b5cf6f1b2..9c75016e8f4 100644
--- a/Tests/LibWeb/Layout/expected/flex-column-constrained-nowrap.txt
+++ b/Tests/LibWeb/Layout/expected/flex-column-constrained-nowrap.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [9,175.65625 102x83.328125]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,260 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x268] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-column-height-constrained-width-constrained.txt b/Tests/LibWeb/Layout/expected/flex-column-height-constrained-width-constrained.txt
index 382264b1aa5..b5656640ea6 100644
--- a/Tests/LibWeb/Layout/expected/flex-column-height-constrained-width-constrained.txt
+++ b/Tests/LibWeb/Layout/expected/flex-column-height-constrained-width-constrained.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [9,175.65625 102x83.328125]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,260 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x268] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-column-height-constrained.txt b/Tests/LibWeb/Layout/expected/flex-column-height-constrained.txt
index ba38dd5c2ee..0a2a7088a78 100644
--- a/Tests/LibWeb/Layout/expected/flex-column-height-constrained.txt
+++ b/Tests/LibWeb/Layout/expected/flex-column-height-constrained.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [9,175.65625 102x83.328125]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,260 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x268] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-column-height-unconstrained.txt b/Tests/LibWeb/Layout/expected/flex-column-height-unconstrained.txt
index 09395073ae2..5de570b932c 100644
--- a/Tests/LibWeb/Layout/expected/flex-column-height-unconstrained.txt
+++ b/Tests/LibWeb/Layout/expected/flex-column-height-unconstrained.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [9,213 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,316 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x324] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-and-max-width.txt b/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-and-max-width.txt
index fdfeea8e1d7..9295d749da6 100644
--- a/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-and-max-width.txt
+++ b/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-and-max-width.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [1,1 798x94]
       PaintableWithLines (BlockContainer<MAIN>) [2,2 402x92]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x94] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-depending-auto-width-with-max-width-constraint.txt b/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-depending-auto-width-with-max-width-constraint.txt
index 47fc08b13ef..5c6165ca913 100644
--- a/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-depending-auto-width-with-max-width-constraint.txt
+++ b/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-depending-auto-width-with-max-width-constraint.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>.hero) [1,1 602x349]
       PaintableWithLines (BlockContainer<DIV>.header) [101,2 402x347]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x349] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-depending-on-auto-width.txt b/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-depending-on-auto-width.txt
index 76edc2e9c1f..47774c4e58e 100644
--- a/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-depending-on-auto-width.txt
+++ b/Tests/LibWeb/Layout/expected/flex-column-item-with-auto-height-depending-on-auto-width.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>.hero) [9,9 502x464] overflow: [9,10 502x462]
       PaintableWithLines (BlockContainer<DIV>.upper) [9,10 502x462]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x480] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-container-constrained-nowrap.txt b/Tests/LibWeb/Layout/expected/flex-container-constrained-nowrap.txt
index da38b1616f9..7cb925a1248 100644
--- a/Tests/LibWeb/Layout/expected/flex-container-constrained-nowrap.txt
+++ b/Tests/LibWeb/Layout/expected/flex-container-constrained-nowrap.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [175.65625,9 83.328125x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-container-constrained-wrap.txt b/Tests/LibWeb/Layout/expected/flex-container-constrained-wrap.txt
index 021ca75ffe5..4c4fb77e3bb 100644
--- a/Tests/LibWeb/Layout/expected/flex-container-constrained-wrap.txt
+++ b/Tests/LibWeb/Layout/expected/flex-container-constrained-wrap.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [9,111 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,214 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x222] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-container-max-content-width-with-definite-height-and-item-that-has-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/flex-container-max-content-width-with-definite-height-and-item-that-has-aspect-ratio.txt
index 58662bc1119..125236c1b25 100644
--- a/Tests/LibWeb/Layout/expected/flex-container-max-content-width-with-definite-height-and-item-that-has-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/flex-container-max-content-width-with-definite-height-and-item-that-has-aspect-ratio.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 100x100]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 100x100]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-container-width-constrained.txt b/Tests/LibWeb/Layout/expected/flex-container-width-constrained.txt
index 8a3d34491d2..b0ac51b6610 100644
--- a/Tests/LibWeb/Layout/expected/flex-container-width-constrained.txt
+++ b/Tests/LibWeb/Layout/expected/flex-container-width-constrained.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [175.65625,9 83.328125x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-frozen-items-should-be-respected.txt b/Tests/LibWeb/Layout/expected/flex-frozen-items-should-be-respected.txt
index 650e58c2ce4..72ce958aac4 100644
--- a/Tests/LibWeb/Layout/expected/flex-frozen-items-should-be-respected.txt
+++ b/Tests/LibWeb/Layout/expected/flex-frozen-items-should-be-respected.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.last.item) [564.25,11 224.75x50]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-grow-0-column.txt b/Tests/LibWeb/Layout/expected/flex-grow-0-column.txt
index 9ac698163ce..559c943ee03 100644
--- a/Tests/LibWeb/Layout/expected/flex-grow-0-column.txt
+++ b/Tests/LibWeb/Layout/expected/flex-grow-0-column.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [9,49 102x20]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,70 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x78] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-grow-1.txt b/Tests/LibWeb/Layout/expected/flex-grow-1.txt
index c04d012f1c2..c8f43feb412 100644
--- a/Tests/LibWeb/Layout/expected/flex-grow-1.txt
+++ b/Tests/LibWeb/Layout/expected/flex-grow-1.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [407,9 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-grow-2.txt b/Tests/LibWeb/Layout/expected/flex-grow-2.txt
index 9c753a289cb..a8f1e871020 100644
--- a/Tests/LibWeb/Layout/expected/flex-grow-2.txt
+++ b/Tests/LibWeb/Layout/expected/flex-grow-2.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [260,9 249x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-item-auto-height-with-wrap.txt b/Tests/LibWeb/Layout/expected/flex-item-auto-height-with-wrap.txt
index 123cb8c2a7c..f3bf1b967aa 100644
--- a/Tests/LibWeb/Layout/expected/flex-item-auto-height-with-wrap.txt
+++ b/Tests/LibWeb/Layout/expected/flex-item-auto-height-with-wrap.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.inner) [8,8 400x18]
         PaintableWithLines (BlockContainer(anonymous)) [8,8 348.609375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-item-on-row-with-intrinsic-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/flex-item-on-row-with-intrinsic-aspect-ratio.txt
index c2263c64340..d4cc14597ea 100644
--- a/Tests/LibWeb/Layout/expected/flex-item-on-row-with-intrinsic-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/flex-item-on-row-with-intrinsic-aspect-ratio.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x200]
     PaintableBox (Box<BODY>) [0,0 800x200]
       ImagePaintable (ImageBox<IMG>) [0,0 400x200]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x200] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-item-vertical-padding-relative-to-flex-container-width.txt b/Tests/LibWeb/Layout/expected/flex-item-vertical-padding-relative-to-flex-container-width.txt
index ae7052120c2..b251417ac57 100644
--- a/Tests/LibWeb/Layout/expected/flex-item-vertical-padding-relative-to-flex-container-width.txt
+++ b/Tests/LibWeb/Layout/expected/flex-item-vertical-padding-relative-to-flex-container-width.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.flex-container) [10,10 602x12] overflow: [11,11 600x200]
         PaintableWithLines (BlockContainer<DIV>.flex-item) [11,11 29.15625x200]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x30] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-item-with-cyclic-percentage-height.txt b/Tests/LibWeb/Layout/expected/flex-item-with-cyclic-percentage-height.txt
index 9b6a9fda7a9..0fad595e33d 100644
--- a/Tests/LibWeb/Layout/expected/flex-item-with-cyclic-percentage-height.txt
+++ b/Tests/LibWeb/Layout/expected/flex-item-with-cyclic-percentage-height.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.project) [11,11 46.03125x20]
           PaintableWithLines (BlockContainer(anonymous)) [12,12 44.03125x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-item-with-intrinsic-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/flex-item-with-intrinsic-aspect-ratio.txt
index bf42f016607..78444a9e3b1 100644
--- a/Tests/LibWeb/Layout/expected/flex-item-with-intrinsic-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/flex-item-with-intrinsic-aspect-ratio.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x200]
     PaintableBox (Box<BODY>) [0,0 400x200]
       ImagePaintable (ImageBox<IMG>) [0,0 400x200]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x200] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-justify-end-gap.txt b/Tests/LibWeb/Layout/expected/flex-justify-end-gap.txt
index e1bc8cdce7b..6b91b54e649 100644
--- a/Tests/LibWeb/Layout/expected/flex-justify-end-gap.txt
+++ b/Tests/LibWeb/Layout/expected/flex-justify-end-gap.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.item) [260,414 50x50]
         PaintableWithLines (BlockContainer<DIV>.item) [360,414 50x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,466 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x474] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-margin-auto-justify-content.txt b/Tests/LibWeb/Layout/expected/flex-margin-auto-justify-content.txt
index a9efe30bd49..f81b3bf88c7 100644
--- a/Tests/LibWeb/Layout/expected/flex-margin-auto-justify-content.txt
+++ b/Tests/LibWeb/Layout/expected/flex-margin-auto-justify-content.txt
@@ -28,3 +28,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [457,9 152x52]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,62 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-row.txt b/Tests/LibWeb/Layout/expected/flex-row.txt
index 69c86036633..8b1c4581648 100644
--- a/Tests/LibWeb/Layout/expected/flex-row.txt
+++ b/Tests/LibWeb/Layout/expected/flex-row.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [213,9 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-shrink-1.txt b/Tests/LibWeb/Layout/expected/flex-shrink-1.txt
index 68d4de95c62..a57899fa1f6 100644
--- a/Tests/LibWeb/Layout/expected/flex-shrink-1.txt
+++ b/Tests/LibWeb/Layout/expected/flex-shrink-1.txt
@@ -42,3 +42,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [157,9 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-shrink-2.txt b/Tests/LibWeb/Layout/expected/flex-shrink-2.txt
index e7886c04f1d..96521fbe87c 100644
--- a/Tests/LibWeb/Layout/expected/flex-shrink-2.txt
+++ b/Tests/LibWeb/Layout/expected/flex-shrink-2.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [224.671875,9 284.328125x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex-shrink-3.txt b/Tests/LibWeb/Layout/expected/flex-shrink-3.txt
index bde3fc3eaef..ec83c76df46 100644
--- a/Tests/LibWeb/Layout/expected/flex-shrink-3.txt
+++ b/Tests/LibWeb/Layout/expected/flex-shrink-3.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [213,9 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,112 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-align-items.txt b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-align-items.txt
index 53ac5b3d018..5dfc269ce04 100644
--- a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-align-items.txt
+++ b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-align-items.txt
@@ -97,3 +97,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.outer.self-end) [28,368 170x170]
         PaintableWithLines (BlockContainer<DIV>) [38,458 170x70]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [10,10 780x546] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-justify-content.txt b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-justify-content.txt
index 8a7b97bea8b..f8fbaa3fed5 100644
--- a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-justify-content.txt
+++ b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-justify-content.txt
@@ -448,3 +448,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x2500]
         PaintableWithLines (BlockContainer<DIV>) [11,2437 152x52]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,2490 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x2498] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-padding-on-flex-container.txt b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-padding-on-flex-container.txt
index e0ca409b8eb..e0a6f6f1194 100644
--- a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-padding-on-flex-container.txt
+++ b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-static-position-with-padding-on-flex-container.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>#orange) [18,18 50x50]
         PaintableWithLines (BlockContainer<DIV>#red) [18,18 9.703125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x54] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-with-auto-height.txt b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-with-auto-height.txt
index b40f442e745..71c9e0411b7 100644
--- a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-with-auto-height.txt
+++ b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-with-auto-height.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 784x0] overflow: [8,-42 100x200]
       PaintableWithLines (BlockContainer<DIV>.abspos) [8,-42 100x100] overflow: [8,-42 100x200]
         PaintableWithLines (BlockContainer<DIV>.green) [8,-42 100x200]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-with-percentage-height.txt b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-with-percentage-height.txt
index 2ac9f620880..4188ad9a326 100644
--- a/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-with-percentage-height.txt
+++ b/Tests/LibWeb/Layout/expected/flex/abspos-flex-child-with-percentage-height.txt
@@ -35,3 +35,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer(anonymous)) [8,8 200x0]
         PaintableWithLines (BlockContainer<DIV>) [8,8 300x300]
         PaintableWithLines (BlockContainer(anonymous)) [8,308 200x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/align-center-margin.txt b/Tests/LibWeb/Layout/expected/flex/align-center-margin.txt
index 8c6aaf1bbd4..d523dc73e93 100644
--- a/Tests/LibWeb/Layout/expected/flex/align-center-margin.txt
+++ b/Tests/LibWeb/Layout/expected/flex/align-center-margin.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 784x200]
       PaintableWithLines (BlockContainer<DIV>) [8,58 100x100]
       PaintableWithLines (BlockContainer<SPAN>) [108,108 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/align-items-normal.txt b/Tests/LibWeb/Layout/expected/flex/align-items-normal.txt
index 3e0cf12bb8a..d36d98984e5 100644
--- a/Tests/LibWeb/Layout/expected/flex/align-items-normal.txt
+++ b/Tests/LibWeb/Layout/expected/flex/align-items-normal.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x116]
     PaintableBox (Box<BODY>) [8,8 784x100]
       PaintableWithLines (BlockContainer<DIV>) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/align-keywords-start-and-end.txt b/Tests/LibWeb/Layout/expected/flex/align-keywords-start-and-end.txt
index 7e703bd28a5..0aec67d07b6 100644
--- a/Tests/LibWeb/Layout/expected/flex/align-keywords-start-and-end.txt
+++ b/Tests/LibWeb/Layout/expected/flex/align-keywords-start-and-end.txt
@@ -43,3 +43,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [387.546875,257 123.453125x20]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,278 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x286] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/align-self-end-crash.txt b/Tests/LibWeb/Layout/expected/flex/align-self-end-crash.txt
index 783f61a944b..dbe8bb83ddf 100644
--- a/Tests/LibWeb/Layout/expected/flex/align-self-end-crash.txt
+++ b/Tests/LibWeb/Layout/expected/flex/align-self-end-crash.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableBox (Box<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/automatic-minimum-size-with-explicit-flex-basis-and-flex-container-with-max-content-main-size.txt b/Tests/LibWeb/Layout/expected/flex/automatic-minimum-size-with-explicit-flex-basis-and-flex-container-with-max-content-main-size.txt
index 64bbe276b49..5ba8c6c6624 100644
--- a/Tests/LibWeb/Layout/expected/flex/automatic-minimum-size-with-explicit-flex-basis-and-flex-container-with-max-content-main-size.txt
+++ b/Tests/LibWeb/Layout/expected/flex/automatic-minimum-size-with-explicit-flex-basis-and-flex-container-with-max-content-main-size.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>.flex) [9,9 40.84375x52]
       PaintableWithLines (BlockContainer<DIV>.item) [10,10 38.84375x50]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x68] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/box-baseline-with-inline-flex-empty-child.txt b/Tests/LibWeb/Layout/expected/flex/box-baseline-with-inline-flex-empty-child.txt
index f191182975b..0cbb1a44c27 100644
--- a/Tests/LibWeb/Layout/expected/flex/box-baseline-with-inline-flex-empty-child.txt
+++ b/Tests/LibWeb/Layout/expected/flex/box-baseline-with-inline-flex-empty-child.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.first) [10,10 780x24]
         PaintableBox (Box<SPAN>.second) [11,11 22x22]
           PaintableWithLines (BlockContainer(anonymous)) [22,22 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x42] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/br-element-does-not-get-blockified-by-itself.txt b/Tests/LibWeb/Layout/expected/flex/br-element-does-not-get-blockified-by-itself.txt
index 8288d6865ed..3ecadcd29e4 100644
--- a/Tests/LibWeb/Layout/expected/flex/br-element-does-not-get-blockified-by-itself.txt
+++ b/Tests/LibWeb/Layout/expected/flex/br-element-does-not-get-blockified-by-itself.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
           TextPaintable (TextNode<#text>)
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/calc-flex-basis.txt b/Tests/LibWeb/Layout/expected/flex/calc-flex-basis.txt
index 5263b27bb8b..9e1e544ac1f 100644
--- a/Tests/LibWeb/Layout/expected/flex/calc-flex-basis.txt
+++ b/Tests/LibWeb/Layout/expected/flex/calc-flex-basis.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.flex-item) [400,41 388x30]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x80] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/column-layout-intrinsic-main-size-with-cross-max-size-constraint.txt b/Tests/LibWeb/Layout/expected/flex/column-layout-intrinsic-main-size-with-cross-max-size-constraint.txt
index 66c36586634..ee073a0ce58 100644
--- a/Tests/LibWeb/Layout/expected/flex/column-layout-intrinsic-main-size-with-cross-max-size-constraint.txt
+++ b/Tests/LibWeb/Layout/expected/flex/column-layout-intrinsic-main-size-with-cross-max-size-constraint.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 784x100]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x100]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/columns-33-percent-width.txt b/Tests/LibWeb/Layout/expected/flex/columns-33-percent-width.txt
index a7125dad5bd..29fdfcd7815 100644
--- a/Tests/LibWeb/Layout/expected/flex/columns-33-percent-width.txt
+++ b/Tests/LibWeb/Layout/expected/flex/columns-33-percent-width.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 166.65625x100]
       PaintableWithLines (BlockContainer<DIV>) [174.65625,8 166.65625x100]
       PaintableWithLines (BlockContainer<DIV>) [341.3125,8 166.65625x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/cross-size-of-item-with-box-sizing-border-box-and-nonzero-padding.txt b/Tests/LibWeb/Layout/expected/flex/cross-size-of-item-with-box-sizing-border-box-and-nonzero-padding.txt
index 9e1147ffdc2..7a3a5f01afa 100644
--- a/Tests/LibWeb/Layout/expected/flex/cross-size-of-item-with-box-sizing-border-box-and-nonzero-padding.txt
+++ b/Tests/LibWeb/Layout/expected/flex/cross-size-of-item-with-box-sizing-border-box-and-nonzero-padding.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.outer.flex.flex-wrap) [10,10 780x230]
         PaintableWithLines (BlockContainer<DIV>.inner) [11,11 778x228]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x248] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-basis-intrinsic-sizing-keywords.txt b/Tests/LibWeb/Layout/expected/flex/flex-basis-intrinsic-sizing-keywords.txt
index 90fa7d01beb..2d56d352f9f 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-basis-intrinsic-sizing-keywords.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-basis-intrinsic-sizing-keywords.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.auto) [231.640625,8 0x54] overflow: [231.640625,8 27.640625x54]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-column-container-with-max-width-max-content.txt b/Tests/LibWeb/Layout/expected/flex/flex-column-container-with-max-width-max-content.txt
index 51d4779cd42..bfbb2748377 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-column-container-with-max-width-max-content.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-column-container-with-max-width-max-content.txt
@@ -5,3 +5,6 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableBox (Box<BODY>) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-intrinsic-aspect-ratio-and-percentage-max-width.txt b/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-intrinsic-aspect-ratio-and-percentage-max-width.txt
index d7fdcaec11d..63d9c43832b 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-intrinsic-aspect-ratio-and-percentage-max-width.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-intrinsic-aspect-ratio-and-percentage-max-width.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x122]
     PaintableBox (Box<BODY>) [9,9 782x104]
       ImagePaintable (ImageBox<IMG>) [10,10 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-natural-aspect-ratio-and-automatic-cross-size.txt b/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-natural-aspect-ratio-and-automatic-cross-size.txt
index e7f7a977948..674083d2d08 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-natural-aspect-ratio-and-automatic-cross-size.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-natural-aspect-ratio-and-automatic-cross-size.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [0,0 800x100]
       SVGSVGPaintable (SVGSVGBox<svg>) [0,0 200x100]
         SVGPathPaintable (SVGGeometryBox<rect>) [0,0 200x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x100] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-percentage-max-width.txt b/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-percentage-max-width.txt
index cfd3bf11b31..fbff907f97f 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-percentage-max-width.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-column-item-with-percentage-max-width.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.flex) [10,10 54x102]
         PaintableWithLines (BlockContainer<DIV>.hmm) [11,11 52x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-column-reverse-constrained-wrap.txt b/Tests/LibWeb/Layout/expected/flex/flex-column-reverse-constrained-wrap.txt
index 3eddf15794e..89f66c187bf 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-column-reverse-constrained-wrap.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-column-reverse-constrained-wrap.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [134,157 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,260 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x268] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-constrained-wrap-reverse.txt b/Tests/LibWeb/Layout/expected/flex/flex-constrained-wrap-reverse.txt
index bfbc9152b2f..b648ce99ee1 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-constrained-wrap-reverse.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-constrained-wrap-reverse.txt
@@ -129,3 +129,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x1024]
         PaintableWithLines (BlockContainer<DIV>.box) [9,765 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,1016 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x1024] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-container-intrinsic-cross-size-with-max-content-main-size.txt b/Tests/LibWeb/Layout/expected/flex/flex-container-intrinsic-cross-size-with-max-content-main-size.txt
index 5bd703b630f..018ef3d5a9e 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-container-intrinsic-cross-size-with-max-content-main-size.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-container-intrinsic-cross-size-with-max-content-main-size.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.inner) [18,18 280.84375x18]
         PaintableWithLines (BlockContainer(anonymous)) [18,18 280.84375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x54] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-container-with-max-width-and-negative-margin-in-same-axis.txt b/Tests/LibWeb/Layout/expected/flex/flex-container-with-max-width-and-negative-margin-in-same-axis.txt
index 9abf5038960..7f2df1e6465 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-container-with-max-width-and-negative-margin-in-same-axis.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-container-with-max-width-and-negative-margin-in-same-axis.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [-92,0 892x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100] overflow: [-92,8 884x100]
       PaintableWithLines (BlockContainer<DIV>#container-of-flex) [8,8 100x100] overflow: [-92,8 200x100]
         PaintableBox (Box<DIV>#flex) [-92,8 200x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-gap-between-items-and-lines.txt b/Tests/LibWeb/Layout/expected/flex/flex-gap-between-items-and-lines.txt
index cc2aec9e723..bc395840029 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-gap-between-items-and-lines.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-gap-between-items-and-lines.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [63,155 32x32]
         PaintableWithLines (BlockContainer<DIV>) [11,227 32x32]
         PaintableWithLines (BlockContainer<DIV>) [63,227 32x32]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x268] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-item-min-width-fit-content.txt b/Tests/LibWeb/Layout/expected/flex/flex-item-min-width-fit-content.txt
index d6a5505c3fc..7767aede8e8 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-item-min-width-fit-content.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-item-min-width-fit-content.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.button) [453.671875,11 55.328125x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-item-on-row-with-intrinsic-size.txt b/Tests/LibWeb/Layout/expected/flex/flex-item-on-row-with-intrinsic-size.txt
index 5cd03b9a5ce..089a0851e57 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-item-on-row-with-intrinsic-size.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-item-on-row-with-intrinsic-size.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x8]
       PaintableBox (Box<DIV>) [8,8 784x8]
         ImagePaintable (ImageBox<IMG>) [8,8 8x8]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x24] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-item-percentage-main-size-during-min-content-sizing.txt b/Tests/LibWeb/Layout/expected/flex/flex-item-percentage-main-size-during-min-content-sizing.txt
index 4839038df49..b41de07e50c 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-item-percentage-main-size-during-min-content-sizing.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-item-percentage-main-size-during-min-content-sizing.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableBox (Box<HTML>) [0,0 60x50]
     PaintableBox (Box<BODY>) [8,3 44x44]
       ImagePaintable (ImageBox<IMG>) [8,3 44x44]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for Box<HTML> [0,0 60x50] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-item-with-calc-main-size-and-layout-dependent-containing-block-size.txt b/Tests/LibWeb/Layout/expected/flex/flex-item-with-calc-main-size-and-layout-dependent-containing-block-size.txt
index b9ef1052c42..50a8f9f1dbc 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-item-with-calc-main-size-and-layout-dependent-containing-block-size.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-item-with-calc-main-size-and-layout-dependent-containing-block-size.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.orange) [8,8 194.71875x54]
         PaintableWithLines (BlockContainer<DIV>.lime) [8,8 87.359375x54]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-item-with-intrinsic-aspect-ratio-and-max-height.txt b/Tests/LibWeb/Layout/expected/flex/flex-item-with-intrinsic-aspect-ratio-and-max-height.txt
index e4a3e136faa..bd3663a5537 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-item-with-intrinsic-aspect-ratio-and-max-height.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-item-with-intrinsic-aspect-ratio-and-max-height.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x71.984375]
     PaintableBox (Box<BODY>) [9,9 782x53.984375] overflow: [10,9 780x52.984375]
       ImagePaintable (ImageBox<IMG>) [10,9 68.65625x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x69.984375] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-optimization-cases.txt b/Tests/LibWeb/Layout/expected/flex/flex-optimization-cases.txt
index ad096156981..6d1ef9dde2c 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-optimization-cases.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-optimization-cases.txt
@@ -243,3 +243,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x2016]
       PaintableBox (Box<DIV>) [8,1012.421875 500x8]
         ImagePaintable (ImageBox<IMG>) [8,1012.421875 8x8]
       PaintableWithLines (BlockContainer(anonymous)) [8,1020.421875 500x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x2016] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-row-reverse-constrained-wrap.txt b/Tests/LibWeb/Layout/expected/flex/flex-row-reverse-constrained-wrap.txt
index 70adc823172..cd1604792c6 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-row-reverse-constrained-wrap.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-row-reverse-constrained-wrap.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [157,111 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,214 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x222] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-row-reverse-with-centered-content.txt b/Tests/LibWeb/Layout/expected/flex/flex-row-reverse-with-centered-content.txt
index 91925a9917a..4d72e784e7c 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-row-reverse-with-centered-content.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-row-reverse-with-centered-content.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [325,8 50x50]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/flex-shorthand-flex-basis-zero-percent.txt b/Tests/LibWeb/Layout/expected/flex/flex-shorthand-flex-basis-zero-percent.txt
index d4c1a0d562f..0e944d5b288 100644
--- a/Tests/LibWeb/Layout/expected/flex/flex-shorthand-flex-basis-zero-percent.txt
+++ b/Tests/LibWeb/Layout/expected/flex/flex-shorthand-flex-basis-zero-percent.txt
@@ -40,3 +40,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.item.two) [47.84375,65 463.15625x52]
           PaintableWithLines (BlockContainer(anonymous)) [48.84375,66 55.359375x50]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x126] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/inf-available-space-with-auto-margins.txt b/Tests/LibWeb/Layout/expected/flex/inf-available-space-with-auto-margins.txt
index 20a7eb208df..2ee6016e3dc 100644
--- a/Tests/LibWeb/Layout/expected/flex/inf-available-space-with-auto-margins.txt
+++ b/Tests/LibWeb/Layout/expected/flex/inf-available-space-with-auto-margins.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 784x18]
       PaintableWithLines (BlockContainer<MAIN>) [8,8 784x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/inline-flex-baseline-of-child.txt b/Tests/LibWeb/Layout/expected/flex/inline-flex-baseline-of-child.txt
index 0bae1e9fff9..579d20bf893 100644
--- a/Tests/LibWeb/Layout/expected/flex/inline-flex-baseline-of-child.txt
+++ b/Tests/LibWeb/Layout/expected/flex/inline-flex-baseline-of-child.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [376,32 9.09375x64]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,98 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x106] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/inline-flex-early-resolution-of-percentage-height.txt b/Tests/LibWeb/Layout/expected/flex/inline-flex-early-resolution-of-percentage-height.txt
index 2b67fdefc7d..0b346da537f 100644
--- a/Tests/LibWeb/Layout/expected/flex/inline-flex-early-resolution-of-percentage-height.txt
+++ b/Tests/LibWeb/Layout/expected/flex/inline-flex-early-resolution-of-percentage-height.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 200x200]
       PaintableWithLines (BlockContainer<DIV>) [8,8 200x200]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/inline-flex-with-main-axis-margin-on-flex-container.txt b/Tests/LibWeb/Layout/expected/flex/inline-flex-with-main-axis-margin-on-flex-container.txt
index 61c6301023f..9bf4b3d7400 100644
--- a/Tests/LibWeb/Layout/expected/flex/inline-flex-with-main-axis-margin-on-flex-container.txt
+++ b/Tests/LibWeb/Layout/expected/flex/inline-flex-with-main-axis-margin-on-flex-container.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [9,9 164.40625x22]
       PaintableWithLines (BlockContainer<DIV>) [10,10 162.40625x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 500x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/intrinsic-cross-size-contribution-with-main-size-constraint.txt b/Tests/LibWeb/Layout/expected/flex/intrinsic-cross-size-contribution-with-main-size-constraint.txt
index 5baf890e96b..9f73dcc540e 100644
--- a/Tests/LibWeb/Layout/expected/flex/intrinsic-cross-size-contribution-with-main-size-constraint.txt
+++ b/Tests/LibWeb/Layout/expected/flex/intrinsic-cross-size-contribution-with-main-size-constraint.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x0]
     PaintableBox (Box<BODY>) [8,8 50x50]
       ImagePaintable (ImageBox<IMG>) [8,8 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/intrinsic-height-of-column-items-with-different-kinds-of-width.txt b/Tests/LibWeb/Layout/expected/flex/intrinsic-height-of-column-items-with-different-kinds-of-width.txt
index fd02283bd01..9e35659a09c 100644
--- a/Tests/LibWeb/Layout/expected/flex/intrinsic-height-of-column-items-with-different-kinds-of-width.txt
+++ b/Tests/LibWeb/Layout/expected/flex/intrinsic-height-of-column-items-with-different-kinds-of-width.txt
@@ -69,3 +69,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.inner) [11,99 62.90625x38]
           PaintableWithLines (BlockContainer(anonymous)) [12,100 60.90625x36]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x146] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/intrinsic-height-of-flex-container-with-svg-item-that-only-has-natural-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/flex/intrinsic-height-of-flex-container-with-svg-item-that-only-has-natural-aspect-ratio.txt
index 33e74be3fb1..1b1e0d2efdc 100644
--- a/Tests/LibWeb/Layout/expected/flex/intrinsic-height-of-flex-container-with-svg-item-that-only-has-natural-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/flex/intrinsic-height-of-flex-container-with-svg-item-that-only-has-natural-aspect-ratio.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x800]
     PaintableBox (Box<BODY>) [8,8 784x784]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x784]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 392x392]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x800] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/justify-content-1.txt b/Tests/LibWeb/Layout/expected/flex/justify-content-1.txt
index 85b05d35924..f9def01ad0f 100644
--- a/Tests/LibWeb/Layout/expected/flex/justify-content-1.txt
+++ b/Tests/LibWeb/Layout/expected/flex/justify-content-1.txt
@@ -928,3 +928,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x7300]
         PaintableWithLines (BlockContainer<DIV>) [11,6989 52x52]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,7290 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x7298] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/justify-content-on-min-content-with-gap.txt b/Tests/LibWeb/Layout/expected/flex/justify-content-on-min-content-with-gap.txt
index 8a5db81bcfa..63b0e271f5d 100644
--- a/Tests/LibWeb/Layout/expected/flex/justify-content-on-min-content-with-gap.txt
+++ b/Tests/LibWeb/Layout/expected/flex/justify-content-on-min-content-with-gap.txt
@@ -62,3 +62,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.box) [68,88 40x40]
         PaintableWithLines (BlockContainer<DIV>.box) [128,88 40x40]
       PaintableWithLines (BlockContainer(anonymous)) [8,128 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/justify-content-space-between-single-item.txt b/Tests/LibWeb/Layout/expected/flex/justify-content-space-between-single-item.txt
index 4fb3991331d..8069646cfc8 100644
--- a/Tests/LibWeb/Layout/expected/flex/justify-content-space-between-single-item.txt
+++ b/Tests/LibWeb/Layout/expected/flex/justify-content-space-between-single-item.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.container) [8,8 784x18]
         PaintableWithLines (BlockContainer<DIV>) [8,8 14.265625x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/justify-content-with-margin-auto-child.txt b/Tests/LibWeb/Layout/expected/flex/justify-content-with-margin-auto-child.txt
index 48e6b07c5b5..bd493d8915e 100644
--- a/Tests/LibWeb/Layout/expected/flex/justify-content-with-margin-auto-child.txt
+++ b/Tests/LibWeb/Layout/expected/flex/justify-content-with-margin-auto-child.txt
@@ -560,3 +560,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x4388]
         PaintableWithLines (BlockContainer<DIV>) [11,4077 52x52]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,4378 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x4386] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/list-container-display-contents.txt b/Tests/LibWeb/Layout/expected/flex/list-container-display-contents.txt
index 19f7ad596e7..47e885dd8db 100644
--- a/Tests/LibWeb/Layout/expected/flex/list-container-display-contents.txt
+++ b/Tests/LibWeb/Layout/expected/flex/list-container-display-contents.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>#item-2) [762,16 30x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x50] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/multi-line-column-container-with-automatic-height.txt b/Tests/LibWeb/Layout/expected/flex/multi-line-column-container-with-automatic-height.txt
index 64d1eb3b939..fef41ede6da 100644
--- a/Tests/LibWeb/Layout/expected/flex/multi-line-column-container-with-automatic-height.txt
+++ b/Tests/LibWeb/Layout/expected/flex/multi-line-column-container-with-automatic-height.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [11,11 52x52]
         PaintableWithLines (BlockContainer<DIV>) [11,63 52x52]
         PaintableWithLines (BlockContainer<DIV>) [11,115 52x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x176] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/no-stretch-fit-width-for-item-that-can-resolve-aspect-ratio-through-height.txt b/Tests/LibWeb/Layout/expected/flex/no-stretch-fit-width-for-item-that-can-resolve-aspect-ratio-through-height.txt
index 101bb4798f6..e9cf0dff8c9 100644
--- a/Tests/LibWeb/Layout/expected/flex/no-stretch-fit-width-for-item-that-can-resolve-aspect-ratio-through-height.txt
+++ b/Tests/LibWeb/Layout/expected/flex/no-stretch-fit-width-for-item-that-can-resolve-aspect-ratio-through-height.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 20x20]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 10x10]
       PaintableWithLines (BlockContainer<DIV>) [28,8 100x20]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/percentage-flex-basis-with-indefinite-flex-container-size.txt b/Tests/LibWeb/Layout/expected/flex/percentage-flex-basis-with-indefinite-flex-container-size.txt
index 5349a4ccb0f..8116780ed9f 100644
--- a/Tests/LibWeb/Layout/expected/flex/percentage-flex-basis-with-indefinite-flex-container-size.txt
+++ b/Tests/LibWeb/Layout/expected/flex/percentage-flex-basis-with-indefinite-flex-container-size.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.middle) [8,8 200x18]
         PaintableWithLines (BlockContainer<DIV>.inner) [8,8 200x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/percentage-flex-basis-with-indefinite-reference-value.txt b/Tests/LibWeb/Layout/expected/flex/percentage-flex-basis-with-indefinite-reference-value.txt
index 82c898cb5a9..a135b79eb6a 100644
--- a/Tests/LibWeb/Layout/expected/flex/percentage-flex-basis-with-indefinite-reference-value.txt
+++ b/Tests/LibWeb/Layout/expected/flex/percentage-flex-basis-with-indefinite-reference-value.txt
@@ -35,3 +35,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,146 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,146 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x154] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/percentage-flex-item-height-with-indefinite-containing-block-height.txt b/Tests/LibWeb/Layout/expected/flex/percentage-flex-item-height-with-indefinite-containing-block-height.txt
index c730df12e60..a4bd850aaf2 100644
--- a/Tests/LibWeb/Layout/expected/flex/percentage-flex-item-height-with-indefinite-containing-block-height.txt
+++ b/Tests/LibWeb/Layout/expected/flex/percentage-flex-item-height-with-indefinite-containing-block-height.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.flexContainer) [8,8 784x120]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 784x120]
           PaintableWithLines (BlockContainer<DIV>.green) [8,8 120x120]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/relpos-flex-item.txt b/Tests/LibWeb/Layout/expected/flex/relpos-flex-item.txt
index 305bcb05b05..436ac973b47 100644
--- a/Tests/LibWeb/Layout/expected/flex/relpos-flex-item.txt
+++ b/Tests/LibWeb/Layout/expected/flex/relpos-flex-item.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.athena) [16,16 204x22]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [2,2 796x42] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/reverse-flex-layout-with-space-between-and-space-around.txt b/Tests/LibWeb/Layout/expected/flex/reverse-flex-layout-with-space-between-and-space-around.txt
index f6b69c70271..0b53caa9ea4 100644
--- a/Tests/LibWeb/Layout/expected/flex/reverse-flex-layout-with-space-between-and-space-around.txt
+++ b/Tests/LibWeb/Layout/expected/flex/reverse-flex-layout-with-space-between-and-space-around.txt
@@ -94,3 +94,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x616]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.inner) [8,474 150x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x616] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/reverse-with-justify-content-normal.txt b/Tests/LibWeb/Layout/expected/flex/reverse-with-justify-content-normal.txt
index 987259ef84b..d7cc7b9815a 100644
--- a/Tests/LibWeb/Layout/expected/flex/reverse-with-justify-content-normal.txt
+++ b/Tests/LibWeb/Layout/expected/flex/reverse-with-justify-content-normal.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.item) [108,8 100x100]
       PaintableBox (Box<DIV>.flex.column) [8,208 200x200]
         PaintableWithLines (BlockContainer<DIV>.item) [8,308 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x416] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/space-between-with-negative-remaining-space-on-line.txt b/Tests/LibWeb/Layout/expected/flex/space-between-with-negative-remaining-space-on-line.txt
index d26ba7e1787..24cbf907fa6 100644
--- a/Tests/LibWeb/Layout/expected/flex/space-between-with-negative-remaining-space-on-line.txt
+++ b/Tests/LibWeb/Layout/expected/flex/space-between-with-negative-remaining-space-on-line.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>.spacer) [8,8 200x200]
         PaintableWithLines (BlockContainer<DIV>.lower) [8,208 200x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/specified-size-suggestion-with-box-sizing-border-box.txt b/Tests/LibWeb/Layout/expected/flex/specified-size-suggestion-with-box-sizing-border-box.txt
index f4ae2b6b9c5..b7ab2481d93 100644
--- a/Tests/LibWeb/Layout/expected/flex/specified-size-suggestion-with-box-sizing-border-box.txt
+++ b/Tests/LibWeb/Layout/expected/flex/specified-size-suggestion-with-box-sizing-border-box.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [0,0 800x100]
       ImagePaintable (ImageBox<IMG>) [0,0 400x100]
       ImagePaintable (ImageBox<IMG>.padded) [400,0 400x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x100] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/stretch-alignment-with-cross-gap.txt b/Tests/LibWeb/Layout/expected/flex/stretch-alignment-with-cross-gap.txt
index 35a12d3f5ce..23452a80777 100644
--- a/Tests/LibWeb/Layout/expected/flex/stretch-alignment-with-cross-gap.txt
+++ b/Tests/LibWeb/Layout/expected/flex/stretch-alignment-with-cross-gap.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [113,94.328125 102x22]
         PaintableWithLines (BlockContainer<DIV>) [11,177.65625 102x22]
         PaintableWithLines (BlockContainer<DIV>) [113,177.65625 102x22]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/stretch-fit-width-for-column-layout-svg-item-that-only-has-natural-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/flex/stretch-fit-width-for-column-layout-svg-item-that-only-has-natural-aspect-ratio.txt
index ad06bef9cc7..d954f7ae4e6 100644
--- a/Tests/LibWeb/Layout/expected/flex/stretch-fit-width-for-column-layout-svg-item-that-only-has-natural-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/flex/stretch-fit-width-for-column-layout-svg-item-that-only-has-natural-aspect-ratio.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x800]
     PaintableBox (Box<BODY>) [8,8 784x784]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x784]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 392x392]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x800] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/flex/svg-flex-item-with-percentage-max-size.txt b/Tests/LibWeb/Layout/expected/flex/svg-flex-item-with-percentage-max-size.txt
index f01ad359756..feeb8828ddf 100644
--- a/Tests/LibWeb/Layout/expected/flex/svg-flex-item-with-percentage-max-size.txt
+++ b/Tests/LibWeb/Layout/expected/flex/svg-flex-item-with-percentage-max-size.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           SVGGraphicsPaintable (SVGGraphicsBox<use>) [8,8 100x100]
             SVGGraphicsPaintable (SVGGraphicsBox<symbol>#icon-cart) [8,8 100x100]
               SVGPathPaintable (SVGGeometryBox<rect>) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/floating-non-replaced-element-percentage-padding-against-indefinite-width.txt b/Tests/LibWeb/Layout/expected/floating-non-replaced-element-percentage-padding-against-indefinite-width.txt
index 17906087f96..706e576e005 100644
--- a/Tests/LibWeb/Layout/expected/floating-non-replaced-element-percentage-padding-against-indefinite-width.txt
+++ b/Tests/LibWeb/Layout/expected/floating-non-replaced-element-percentage-padding-against-indefinite-width.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>#box1) [8,8 784x0]
         PaintableWithLines (BlockContainer<DIV>) [8,8 0x0]
           PaintableBox (Box<DIV>#box2) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/floating-replaced-element-percentage-padding-against-indefinite-width.txt b/Tests/LibWeb/Layout/expected/floating-replaced-element-percentage-padding-against-indefinite-width.txt
index 2597f1c3c4e..5eda7f0f44e 100644
--- a/Tests/LibWeb/Layout/expected/floating-replaced-element-percentage-padding-against-indefinite-width.txt
+++ b/Tests/LibWeb/Layout/expected/floating-replaced-element-percentage-padding-against-indefinite-width.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>#box1) [8,8 784x0]
         PaintableWithLines (BlockContainer<DIV>) [8,8 0x0]
           ImagePaintable (ImageBox<IMG>#box2) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/font-family-monospace-quirk.txt b/Tests/LibWeb/Layout/expected/font-family-monospace-quirk.txt
index ba9b679e02a..e2a403bc6e8 100644
--- a/Tests/LibWeb/Layout/expected/font-family-monospace-quirk.txt
+++ b/Tests/LibWeb/Layout/expected/font-family-monospace-quirk.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer<DIV>) [8,179 784x60]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x247] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/font-fractional-size.txt b/Tests/LibWeb/Layout/expected/font-fractional-size.txt
index 21942edc1cc..a76eb73dd80 100644
--- a/Tests/LibWeb/Layout/expected/font-fractional-size.txt
+++ b/Tests/LibWeb/Layout/expected/font-fractional-size.txt
@@ -32,3 +32,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       PaintableWithLines (InlineNode<SPAN>.c) [49.171875,8 13.03125x25]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x41] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/font-size-legacy.txt b/Tests/LibWeb/Layout/expected/font-size-legacy.txt
index 7260ec41b13..9678f806940 100644
--- a/Tests/LibWeb/Layout/expected/font-size-legacy.txt
+++ b/Tests/LibWeb/Layout/expected/font-size-legacy.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       PaintableWithLines (InlineNode<FONT>) [8,11 24.109375x14]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/font-size-zero.txt b/Tests/LibWeb/Layout/expected/font-size-zero.txt
index a067e7f3b53..c6de8b76387 100644
--- a/Tests/LibWeb/Layout/expected/font-size-zero.txt
+++ b/Tests/LibWeb/Layout/expected/font-size-zero.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/font-with-many-normal-values.txt b/Tests/LibWeb/Layout/expected/font-with-many-normal-values.txt
index 949b6ddd0b7..624964a62c7 100644
--- a/Tests/LibWeb/Layout/expected/font-with-many-normal-values.txt
+++ b/Tests/LibWeb/Layout/expected/font-with-many-normal-values.txt
@@ -42,3 +42,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       PaintableWithLines (InlineNode<SPAN>.four) [335.125,8 96.875x200]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/getComputedStyle-on-unconnected-element.txt b/Tests/LibWeb/Layout/expected/getComputedStyle-on-unconnected-element.txt
index 24163658ab9..89baf5c9535 100644
--- a/Tests/LibWeb/Layout/expected/getComputedStyle-on-unconnected-element.txt
+++ b/Tests/LibWeb/Layout/expected/getComputedStyle-on-unconnected-element.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x39]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x23]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x39] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/1fr-1000px.txt b/Tests/LibWeb/Layout/expected/grid/1fr-1000px.txt
index f7d32ab124c..e3d48cd176a 100644
--- a/Tests/LibWeb/Layout/expected/grid/1fr-1000px.txt
+++ b/Tests/LibWeb/Layout/expected/grid/1fr-1000px.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 784x18]
       PaintableWithLines (BlockContainer<NAV>) [8,8 39.78125x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-item-aligned-center.txt b/Tests/LibWeb/Layout/expected/grid/abspos-item-aligned-center.txt
index 63b510468b2..c01935160b1 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-item-aligned-center.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-item-aligned-center.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x204]
       PaintableBox (Box<DIV>.container) [10,10 202x202]
         PaintableWithLines (BlockContainer<DIV>.box) [60,60 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-aligned-in-center.txt b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-aligned-in-center.txt
index b3343224989..8cf543e95cb 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-aligned-in-center.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-aligned-in-center.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x204]
       PaintableBox (Box<DIV>.grid) [10,10 202x202]
         PaintableWithLines (BlockContainer<DIV>.abspos-item) [136,36 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-and-percentage-size-2.txt b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-and-percentage-size-2.txt
index 44b5cbf48f4..aae2878b51a 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-and-percentage-size-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-and-percentage-size-2.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x204]
       PaintableBox (Box<DIV>.grid) [10,10 202x202]
         PaintableWithLines (BlockContainer<DIV>.abspos-item) [111,11 52x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-and-percentage-size.txt b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-and-percentage-size.txt
index 0e5e392f0d4..42710465c15 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-and-percentage-size.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area-and-percentage-size.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x104]
       PaintableBox (Box<DIV>.grid) [10,10 202x102]
         PaintableWithLines (BlockContainer<DIV>.abspos-item) [111,11 52x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area.txt b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area.txt
index 0e5e392f0d4..42710465c15 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-grid-area.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x104]
       PaintableBox (Box<DIV>.grid) [10,10 202x102]
         PaintableWithLines (BlockContainer<DIV>.abspos-item) [111,11 52x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-padding.txt b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-padding.txt
index e808bd0ca56..2cdf514f859 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-padding.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-padding.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.abspos-item-with-auto-placement) [11,11 52x52]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-percentage-padding.txt b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-percentage-padding.txt
index b1622a14f12..88910e93ea5 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-item-with-percentage-padding.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-item-with-percentage-padding.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x104]
       PaintableBox (Box<DIV>.grid) [10,10 202x102]
         PaintableWithLines (BlockContainer<DIV>.abspos-item) [111,11 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-item.txt b/Tests/LibWeb/Layout/expected/grid/abspos-item.txt
index ffe2642f6f4..d0b478a4c8b 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-item.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-item.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [8,8 784x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-placed-into-augmented-row-and-column.txt b/Tests/LibWeb/Layout/expected/grid/abspos-placed-into-augmented-row-and-column.txt
index 8404cbcd0ec..ce391566573 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-placed-into-augmented-row-and-column.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-placed-into-augmented-row-and-column.txt
@@ -48,3 +48,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.abspos-box) [228,228 50x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,278 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x286] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-column-placed-in-augmented-row.txt b/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-column-placed-in-augmented-row.txt
index ead91cc0946..e30e4c0e4fa 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-column-placed-in-augmented-row.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-column-placed-in-augmented-row.txt
@@ -48,3 +48,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.abspos-box) [8,228 270x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,278 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x286] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-row-and-column-contained-by-grid.txt b/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-row-and-column-contained-by-grid.txt
index ac7142b79bb..ab6ef4b96bd 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-row-and-column-contained-by-grid.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-row-and-column-contained-by-grid.txt
@@ -48,3 +48,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.abspos-box) [8,8 270x270]
       PaintableWithLines (BlockContainer(anonymous)) [8,278 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x286] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-row-placed-in-augmented-column.txt b/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-row-placed-in-augmented-column.txt
index def2d31547a..021ca9dfaad 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-row-placed-in-augmented-column.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-with-auto-row-placed-in-augmented-column.txt
@@ -48,3 +48,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.abspos-box) [228,8 50x270]
       PaintableWithLines (BlockContainer(anonymous)) [8,278 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x286] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/abspos-with-grid-container-as-parent.txt b/Tests/LibWeb/Layout/expected/grid/abspos-with-grid-container-as-parent.txt
index 5d31c6e8f45..0c3efa6722f 100644
--- a/Tests/LibWeb/Layout/expected/grid/abspos-with-grid-container-as-parent.txt
+++ b/Tests/LibWeb/Layout/expected/grid/abspos-with-grid-container-as-parent.txt
@@ -57,3 +57,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#fill) [8,183 100x100]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,283 400x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x0] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/align-content.txt b/Tests/LibWeb/Layout/expected/grid/align-content.txt
index b2c4adee2db..bfb13efc5ca 100644
--- a/Tests/LibWeb/Layout/expected/grid/align-content.txt
+++ b/Tests/LibWeb/Layout/expected/grid/align-content.txt
@@ -299,3 +299,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x684]
         PaintableWithLines (BlockContainer<DIV>.item) [174,571.5 30x30]
         PaintableWithLines (BlockContainer<DIV>.item) [219,571.5 30x30]
         PaintableWithLines (BlockContainer<DIV>.item) [264,571.5 30x30]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x684] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/align-items.txt b/Tests/LibWeb/Layout/expected/grid/align-items.txt
index 66522094dbf..f222070cb88 100644
--- a/Tests/LibWeb/Layout/expected/grid/align-items.txt
+++ b/Tests/LibWeb/Layout/expected/grid/align-items.txt
@@ -56,3 +56,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item-padding) [388.765625,195 380.234375x40]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x264] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/align-self.txt b/Tests/LibWeb/Layout/expected/grid/align-self.txt
index cda01478408..def248711b6 100644
--- a/Tests/LibWeb/Layout/expected/grid/align-self.txt
+++ b/Tests/LibWeb/Layout/expected/grid/align-self.txt
@@ -56,3 +56,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item-padding) [388.765625,195 380.234375x40]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x264] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/all-implicit-rows.txt b/Tests/LibWeb/Layout/expected/grid/all-implicit-rows.txt
index fd1ea5f0010..692208dfbc0 100644
--- a/Tests/LibWeb/Layout/expected/grid/all-implicit-rows.txt
+++ b/Tests/LibWeb/Layout/expected/grid/all-implicit-rows.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.grid-item) [400.140625,108 391.859375x100]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/anonymous-inline-child.txt b/Tests/LibWeb/Layout/expected/grid/anonymous-inline-child.txt
index 8036179ffcc..bdf9258bae4 100644
--- a/Tests/LibWeb/Layout/expected/grid/anonymous-inline-child.txt
+++ b/Tests/LibWeb/Layout/expected/grid/anonymous-inline-child.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid) [8,8 784x18]
         PaintableWithLines (BlockContainer(anonymous)) [8,8 784x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-fill-and-named-line-placement.txt b/Tests/LibWeb/Layout/expected/grid/auto-fill-and-named-line-placement.txt
index 60bdbe452a8..52d708a320a 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-fill-and-named-line-placement.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-fill-and-named-line-placement.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid-container) [8,8 784x58]
         PaintableWithLines (BlockContainer<DIV>.grid-item) [8,8 784x58]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x74] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-fill-rows.txt b/Tests/LibWeb/Layout/expected/grid/auto-fill-rows.txt
index dfb78191c65..68e0d59302f 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-fill-rows.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-fill-rows.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [8,226 784x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x252] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-fill.txt b/Tests/LibWeb/Layout/expected/grid/auto-fill.txt
index 25f8b480a47..1d9a6636d10 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-fill.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-fill.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item) [530.65625,8 261.328125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-fit-collapse-empty-tracks.txt b/Tests/LibWeb/Layout/expected/grid/auto-fit-collapse-empty-tracks.txt
index c8b69d6a9a1..89c860699fa 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-fit-collapse-empty-tracks.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-fit-collapse-empty-tracks.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.container) [8,8 784x98]
         PaintableWithLines (BlockContainer<DIV>.item) [18,18 764x78]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x114] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-fit-empty-container.txt b/Tests/LibWeb/Layout/expected/grid/auto-fit-empty-container.txt
index c8c0ac63120..9ef4d246d3a 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-fit-empty-container.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-fit-empty-container.txt
@@ -7,3 +7,6 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableBox (Box<BODY>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-fit-is-invalid-when-min-and-max-are-both-not-definite.txt b/Tests/LibWeb/Layout/expected/grid/auto-fit-is-invalid-when-min-and-max-are-both-not-definite.txt
index 97a50ade0db..0392fefa918 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-fit-is-invalid-when-min-and-max-are-both-not-definite.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-fit-is-invalid-when-min-and-max-are-both-not-definite.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid) [8,8 784x208]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 784x104]
         PaintableWithLines (BlockContainer<DIV>.item) [8,112 784x104]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x224] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-fit.txt b/Tests/LibWeb/Layout/expected/grid/auto-fit.txt
index 25f8b480a47..1d9a6636d10 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-fit.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-fit.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item) [530.65625,8 261.328125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-flow-column-spanning-item.txt b/Tests/LibWeb/Layout/expected/grid/auto-flow-column-spanning-item.txt
index 32f103d0495..c638e00c3fa 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-flow-column-spanning-item.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-flow-column-spanning-item.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 151.359375x18]
       PaintableWithLines (BlockContainer<DIV>.item) [159.359375,8 632.59375x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-flow-column.txt b/Tests/LibWeb/Layout/expected/grid/auto-flow-column.txt
index 6f4220d6087..01d09aaf00a 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-flow-column.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-flow-column.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>) [100.734375,10 109.25x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/auto-track-sizes.txt b/Tests/LibWeb/Layout/expected/grid/auto-track-sizes.txt
index 5471564e53b..91158c9e086 100644
--- a/Tests/LibWeb/Layout/expected/grid/auto-track-sizes.txt
+++ b/Tests/LibWeb/Layout/expected/grid/auto-track-sizes.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>#c2) [8,8 52x24]
         PaintableWithLines (BlockContainer<DIV>#c3) [8,8 83x41]
         PaintableWithLines (BlockContainer<DIV>#c4) [8,8 120x60]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x76] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/basic-2.txt b/Tests/LibWeb/Layout/expected/grid/basic-2.txt
index 7c378c53923..2575ca052ba 100644
--- a/Tests/LibWeb/Layout/expected/grid/basic-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/basic-2.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>#board) [96.171875,8 695.828125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/basic.txt b/Tests/LibWeb/Layout/expected/grid/basic.txt
index 64ccba68554..ac57f56f6f2 100644
--- a/Tests/LibWeb/Layout/expected/grid/basic.txt
+++ b/Tests/LibWeb/Layout/expected/grid/basic.txt
@@ -41,3 +41,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item) [400.140625,26 391.859375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/borders.txt b/Tests/LibWeb/Layout/expected/grid/borders.txt
index b0e2c39126c..4c346840e4f 100644
--- a/Tests/LibWeb/Layout/expected/grid/borders.txt
+++ b/Tests/LibWeb/Layout/expected/grid/borders.txt
@@ -196,3 +196,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid-container) [8,420 784x20] overflow: [8,420 784x28]
         PaintableWithLines (BlockContainer<DIV>.grid-item) [8,420 784x20] overflow: [18,430 6.34375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x448] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/calc-track-size.txt b/Tests/LibWeb/Layout/expected/grid/calc-track-size.txt
index 522a053a9da..f76aba56b07 100644
--- a/Tests/LibWeb/Layout/expected/grid/calc-track-size.txt
+++ b/Tests/LibWeb/Layout/expected/grid/calc-track-size.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.grid-item) [8,8 200x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/clamp-content-based-minimum-size-by-limited-max-track-size.txt b/Tests/LibWeb/Layout/expected/grid/clamp-content-based-minimum-size-by-limited-max-track-size.txt
index 72cefab1c6f..adc847b29d5 100644
--- a/Tests/LibWeb/Layout/expected/grid/clamp-content-based-minimum-size-by-limited-max-track-size.txt
+++ b/Tests/LibWeb/Layout/expected/grid/clamp-content-based-minimum-size-by-limited-max-track-size.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>#a) [18,73 0x25]
         PaintableWithLines (BlockContainer<DIV>#b) [13,98 10x25]
       PaintableWithLines (BlockContainer(anonymous)) [8,128 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/column-1fr-1fr.txt b/Tests/LibWeb/Layout/expected/grid/column-1fr-1fr.txt
index 6cf608a4384..6c65b2a1da7 100644
--- a/Tests/LibWeb/Layout/expected/grid/column-1fr-1fr.txt
+++ b/Tests/LibWeb/Layout/expected/grid/column-1fr-1fr.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid) [8,8 100x100] overflow: [8,8 500x100]
         PaintableWithLines (BlockContainer<DIV>.test) [8,8 100x100] overflow: [8,8 500x100]
           PaintableWithLines (BlockContainer<DIV>.big-child) [8,8 500x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/column-auto-auto.txt b/Tests/LibWeb/Layout/expected/grid/column-auto-auto.txt
index 1c1ecbc439f..b0d441ff829 100644
--- a/Tests/LibWeb/Layout/expected/grid/column-auto-auto.txt
+++ b/Tests/LibWeb/Layout/expected/grid/column-auto-auto.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid) [8,8 100x100] overflow: [8,8 500x100]
         PaintableWithLines (BlockContainer<DIV>.test) [8,8 500x100]
           PaintableWithLines (BlockContainer<DIV>.big-child) [8,8 500x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap-2.txt b/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap-2.txt
index 0333fb4717e..c9070b65ba6 100644
--- a/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap-2.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [425,8 367x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap-3.txt b/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap-3.txt
index d1fcdcd1e99..60b8d5a222e 100644
--- a/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap-3.txt
+++ b/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap-3.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>) [121.125,8 100.0625x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap.txt b/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap.txt
index ab622a2473f..2930786c020 100644
--- a/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap.txt
+++ b/Tests/LibWeb/Layout/expected/grid/columns-auto-fill-with-gap.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid) [0,0 470x200]
         PaintableWithLines (BlockContainer<DIV>.item) [0,0 470x100]
         PaintableWithLines (BlockContainer<DIV>.item) [0,100 470x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x200] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/container-max-width-max-content.txt b/Tests/LibWeb/Layout/expected/grid/container-max-width-max-content.txt
index 2fceffb3f74..3e95c99d615 100644
--- a/Tests/LibWeb/Layout/expected/grid/container-max-width-max-content.txt
+++ b/Tests/LibWeb/Layout/expected/grid/container-max-width-max-content.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid) [8,8 100x100]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 100x100]
       PaintableWithLines (BlockContainer(anonymous)) [8,108 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/container-min-height.txt b/Tests/LibWeb/Layout/expected/grid/container-min-height.txt
index 9bb695471bb..d6e687ad2ed 100644
--- a/Tests/LibWeb/Layout/expected/grid/container-min-height.txt
+++ b/Tests/LibWeb/Layout/expected/grid/container-min-height.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [11,111 778x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/css-calc-in-grid-position.txt b/Tests/LibWeb/Layout/expected/grid/css-calc-in-grid-position.txt
index 7b3d7c847ca..324bbcd5d2c 100644
--- a/Tests/LibWeb/Layout/expected/grid/css-calc-in-grid-position.txt
+++ b/Tests/LibWeb/Layout/expected/grid/css-calc-in-grid-position.txt
@@ -61,3 +61,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.text) [406.96875,26 201x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/define-area-using-line-names.txt b/Tests/LibWeb/Layout/expected/grid/define-area-using-line-names.txt
index 341a714dada..bde986c812b 100644
--- a/Tests/LibWeb/Layout/expected/grid/define-area-using-line-names.txt
+++ b/Tests/LibWeb/Layout/expected/grid/define-area-using-line-names.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<MAIN>) [150,8 500x18]
         PaintableWithLines (BlockContainer<DIV>#item) [150,8 500x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/different-column-sizes.txt b/Tests/LibWeb/Layout/expected/grid/different-column-sizes.txt
index 76ffd71dfbb..8124acf2c70 100644
--- a/Tests/LibWeb/Layout/expected/grid/different-column-sizes.txt
+++ b/Tests/LibWeb/Layout/expected/grid/different-column-sizes.txt
@@ -41,3 +41,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item) [58,26 392x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/distribute-extra-space-across-spanned-tracks.txt b/Tests/LibWeb/Layout/expected/grid/distribute-extra-space-across-spanned-tracks.txt
index cfef9fbfb75..a22ce0a9175 100644
--- a/Tests/LibWeb/Layout/expected/grid/distribute-extra-space-across-spanned-tracks.txt
+++ b/Tests/LibWeb/Layout/expected/grid/distribute-extra-space-across-spanned-tracks.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer(anonymous)) [8,26 392x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/fit-content-1.txt b/Tests/LibWeb/Layout/expected/grid/fit-content-1.txt
index 88ccef45fd1..56b6c562233 100644
--- a/Tests/LibWeb/Layout/expected/grid/fit-content-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/fit-content-1.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.two) [14.34375,8 8.8125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/fit-content-2.txt b/Tests/LibWeb/Layout/expected/grid/fit-content-2.txt
index f60f614d9fa..c80b64c5cbb 100644
--- a/Tests/LibWeb/Layout/expected/grid/fit-content-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/fit-content-2.txt
@@ -42,3 +42,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [570.234375,18 211.765625x180]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/fit-content-3.txt b/Tests/LibWeb/Layout/expected/grid/fit-content-3.txt
index 71c3f508103..888bb6d046d 100644
--- a/Tests/LibWeb/Layout/expected/grid/fit-content-3.txt
+++ b/Tests/LibWeb/Layout/expected/grid/fit-content-3.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer(anonymous)) [8,62 52x52]
           PaintableWithLines (BlockContainer(anonymous)) [8,10 0x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,114 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x122] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/fixed-tracks-followed-by-repeat-auto-fill.txt b/Tests/LibWeb/Layout/expected/grid/fixed-tracks-followed-by-repeat-auto-fill.txt
index 48fbc18fe39..f8c4549cc0c 100644
--- a/Tests/LibWeb/Layout/expected/grid/fixed-tracks-followed-by-repeat-auto-fill.txt
+++ b/Tests/LibWeb/Layout/expected/grid/fixed-tracks-followed-by-repeat-auto-fill.txt
@@ -76,3 +76,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.grid-item) [528,8 50x36]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/float-container-columns-1fr-1fr.txt b/Tests/LibWeb/Layout/expected/grid/float-container-columns-1fr-1fr.txt
index 40ccf6f4851..e4d1efb2318 100644
--- a/Tests/LibWeb/Layout/expected/grid/float-container-columns-1fr-1fr.txt
+++ b/Tests/LibWeb/Layout/expected/grid/float-container-columns-1fr-1fr.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item) [109.640625,26 101.640625x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x44] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/floating-item.txt b/Tests/LibWeb/Layout/expected/grid/floating-item.txt
index b1fc503949e..304f890e73a 100644
--- a/Tests/LibWeb/Layout/expected/grid/floating-item.txt
+++ b/Tests/LibWeb/Layout/expected/grid/floating-item.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x106]
       PaintableBox (Box<DIV>.grid) [10,10 780x104]
         PaintableWithLines (BlockContainer<DIV>.float-left) [11,11 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x122] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/floating-table-wrapper-width.txt b/Tests/LibWeb/Layout/expected/grid/floating-table-wrapper-width.txt
index ae9fd22260d..bd8127aa865 100644
--- a/Tests/LibWeb/Layout/expected/grid/floating-table-wrapper-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/floating-table-wrapper-width.txt
@@ -48,3 +48,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>.right) [171.140625,8 7.75x18]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,36 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x44] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-area-non-token-parts-crash.txt b/Tests/LibWeb/Layout/expected/grid/grid-area-non-token-parts-crash.txt
index c921381db9c..a14aa922885 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-area-non-token-parts-crash.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-area-non-token-parts-crash.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,16 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-column-non-token-parts-crash.txt b/Tests/LibWeb/Layout/expected/grid/grid-column-non-token-parts-crash.txt
index c921381db9c..a14aa922885 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-column-non-token-parts-crash.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-column-non-token-parts-crash.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,16 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-container-min-height-border-box.txt b/Tests/LibWeb/Layout/expected/grid/grid-container-min-height-border-box.txt
index b944ae236e2..dc3aca30cdd 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-container-min-height-border-box.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-container-min-height-border-box.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x316]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x300]
       PaintableBox (Box<DIV>.box) [8,8 784x300]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x316] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-gap-1.txt b/Tests/LibWeb/Layout/expected/grid/grid-gap-1.txt
index 5f0ac4d95f6..51544f0df31 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-gap-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-gap-1.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.four) [450.140625,76 341.859375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x102] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-gap-2.txt b/Tests/LibWeb/Layout/expected/grid/grid-gap-2.txt
index e86d2f36504..32810f5421b 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-gap-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-gap-2.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item) [8,42 359.03125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x68] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-gap-3.txt b/Tests/LibWeb/Layout/expected/grid/grid-gap-3.txt
index 0730c8b66b9..9a6e9d05036 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-gap-3.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-gap-3.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.container) [8,8 784x18]
         PaintableWithLines (BlockContainer<DIV>.item) [410,8 382x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-fixed-paddings.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-fixed-paddings.txt
index 453f465d516..786ba0a7eea 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-fixed-paddings.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-fixed-paddings.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.grid-item) [195.046875,212 136.53125x154]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,366 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x374] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-fixed-size.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-fixed-size.txt
index 8591787258b..1c1843f4ce1 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-fixed-size.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-fixed-size.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid-container) [8,8 784x200]
         PaintableWithLines (BlockContainer<DIV>.first) [8,8 100x200]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-horizontal-margins-auto.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-horizontal-margins-auto.txt
index 8cfaf6369fa..5ad6317d38b 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-horizontal-margins-auto.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-horizontal-margins-auto.txt
@@ -114,3 +114,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.right-margin-auto.fixed-width) [11,351 52x110] overflow: [12,352 52.109375x108]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,462 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x470] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-min-size.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-min-size.txt
index b69530707ba..af928f6ac9d 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-min-size.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-min-size.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.second) [8,110 102x102]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x212] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-margins.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-margins.txt
index 874dcc122d3..3692b302493 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-margins.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-margins.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.grid) [8,8 784x18]
           PaintableWithLines (BlockContainer<DIV>.item) [164.796875,8 470.40625x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-width-2.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-width-2.txt
index f8d293b0ec3..d489441d3e3 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-width-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-width-2.txt
@@ -47,3 +47,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.container) [8,8 200x324]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 100x324]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x332] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-width.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-width.txt
index ef4b1ac8e18..adfe7c1519f 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-percentage-width.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.second) [392.359375,8 79.921875x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-vertical-padding-and-margin-percentages.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-vertical-padding-and-margin-percentages.txt
index 7a740bff9c8..9f6ba8e7d47 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-vertical-padding-and-margin-percentages.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-vertical-padding-and-margin-percentages.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 500x450]
       PaintableWithLines (BlockContainer<DIV>.a) [8,58 500x125]
       PaintableWithLines (BlockContainer<DIV>.b) [8,183 500x175]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x466] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-item-with-fit-content-width.txt b/Tests/LibWeb/Layout/expected/grid/grid-item-with-fit-content-width.txt
index c325a286c6e..0d2ef279e4a 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-item-with-fit-content-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-item-with-fit-content-width.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [9,9 782x22]
       PaintableWithLines (BlockContainer<DIV>.inner) [10,10 134.828125x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-placement-shorthand-single-custom-ident.txt b/Tests/LibWeb/Layout/expected/grid/grid-placement-shorthand-single-custom-ident.txt
index e57b8b49a41..2788d25792b 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-placement-shorthand-single-custom-ident.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-placement-shorthand-single-custom-ident.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.content) [8,26 400x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x134] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-row-height-affected-by-item-margins.txt b/Tests/LibWeb/Layout/expected/grid/grid-row-height-affected-by-item-margins.txt
index 8f90bfa29b4..bdbd3239673 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-row-height-affected-by-item-margins.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-row-height-affected-by-item-margins.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [9,9 782x83.875]
       PaintableWithLines (BlockContainer<H1>) [54.5,31.4375 691x39]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x99.875] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-row-overflow-crash.txt b/Tests/LibWeb/Layout/expected/grid/grid-row-overflow-crash.txt
index 9b2eaf81568..d18d6407f6f 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-row-overflow-crash.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-row-overflow-crash.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>) [8,8 784x0]
         PaintableWithLines (BlockContainer<DIV>) [8,8 0x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-row-start-non-token-parts-crash.txt b/Tests/LibWeb/Layout/expected/grid/grid-row-start-non-token-parts-crash.txt
index c921381db9c..a14aa922885 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-row-start-non-token-parts-crash.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-row-start-non-token-parts-crash.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,16 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-shorthand-property.txt b/Tests/LibWeb/Layout/expected/grid/grid-shorthand-property.txt
index 193f54f4534..97a785c0db8 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-shorthand-property.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-shorthand-property.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableBox (Box<DIV>.container) [8,8 784x100]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 200x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-span-4.txt b/Tests/LibWeb/Layout/expected/grid/grid-span-4.txt
index c0003db79b2..7154b91dd70 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-span-4.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-span-4.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.bar) [10,35 780x25]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x68] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-template-areas-basics.txt b/Tests/LibWeb/Layout/expected/grid/grid-template-areas-basics.txt
index 1bc59221609..b8be026fb49 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-template-areas-basics.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-template-areas-basics.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item.right-top) [400,8 392x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-template-columns-with-min-css-function.txt b/Tests/LibWeb/Layout/expected/grid/grid-template-columns-with-min-css-function.txt
index e7c4c9f7419..8e7cf449c43 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-template-columns-with-min-css-function.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-template-columns-with-min-css-function.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [9,9 782x41]
       PaintableWithLines (BlockContainer<H1>) [54.5,10 691x39]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x57] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-template.txt b/Tests/LibWeb/Layout/expected/grid/grid-template.txt
index 7c51c17ca9a..ace7380919c 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-template.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-template.txt
@@ -68,3 +68,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<FOOTER>) [128,178 664x30]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grid-with-min-content-max-width.txt b/Tests/LibWeb/Layout/expected/grid/grid-with-min-content-max-width.txt
index 8c8f821cc2d..acc3cddc162 100644
--- a/Tests/LibWeb/Layout/expected/grid/grid-with-min-content-max-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grid-with-min-content-max-width.txt
@@ -82,3 +82,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer<DIV>) [8,584 36.84375x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,584 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x592] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/grow-beyond-limits.txt b/Tests/LibWeb/Layout/expected/grid/grow-beyond-limits.txt
index 5119db91b95..ab62da0aede 100644
--- a/Tests/LibWeb/Layout/expected/grid/grow-beyond-limits.txt
+++ b/Tests/LibWeb/Layout/expected/grid/grow-beyond-limits.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.container) [8,8 784x18]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 28.6875x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/image-in-grid.txt b/Tests/LibWeb/Layout/expected/grid/image-in-grid.txt
index 04cd78f7446..3c29d61c35d 100644
--- a/Tests/LibWeb/Layout/expected/grid/image-in-grid.txt
+++ b/Tests/LibWeb/Layout/expected/grid/image-in-grid.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid-container) [8,8 784x24]
         PaintableWithLines (BlockContainer<DIV>.wrapper) [8,8 64.03125x24]
           ImagePaintable (ImageBox<IMG>) [8,8 64.03125x24]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/image-with-percentage-width-and-auto-height.txt b/Tests/LibWeb/Layout/expected/grid/image-with-percentage-width-and-auto-height.txt
index f2bc123fc9e..2ffe9230de7 100644
--- a/Tests/LibWeb/Layout/expected/grid/image-with-percentage-width-and-auto-height.txt
+++ b/Tests/LibWeb/Layout/expected/grid/image-with-percentage-width-and-auto-height.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x50]
       PaintableBox (Box<DIV>#item) [8,8 100x50]
         ImagePaintable (ImageBox<IMG>) [8,8 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/img-with-percentage-width-and-height.txt b/Tests/LibWeb/Layout/expected/grid/img-with-percentage-width-and-height.txt
index 347f4db9c9d..248a9c78884 100644
--- a/Tests/LibWeb/Layout/expected/grid/img-with-percentage-width-and-height.txt
+++ b/Tests/LibWeb/Layout/expected/grid/img-with-percentage-width-and-height.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x66]
     PaintableBox (Box<BODY>) [8,8 50x50]
       ImagePaintable (ImageBox<IMG>) [8,8 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/implicit-lines.txt b/Tests/LibWeb/Layout/expected/grid/implicit-lines.txt
index ba2b671c81d..acf8f6e0763 100644
--- a/Tests/LibWeb/Layout/expected/grid/implicit-lines.txt
+++ b/Tests/LibWeb/Layout/expected/grid/implicit-lines.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item3) [405,118 387x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x236] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/inline-abspos-item.txt b/Tests/LibWeb/Layout/expected/grid/inline-abspos-item.txt
index 6fc08408587..7e54c0f6133 100644
--- a/Tests/LibWeb/Layout/expected/grid/inline-abspos-item.txt
+++ b/Tests/LibWeb/Layout/expected/grid/inline-abspos-item.txt
@@ -32,3 +32,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>.abspos) [41.125,135 23.125x18]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,532 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x537] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/inline-grid-simple.txt b/Tests/LibWeb/Layout/expected/grid/inline-grid-simple.txt
index f29451bc036..3e5c5d9f07e 100644
--- a/Tests/LibWeb/Layout/expected/grid/inline-grid-simple.txt
+++ b/Tests/LibWeb/Layout/expected/grid/inline-grid-simple.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 26.953125x18]
       PaintableWithLines (BlockContainer(anonymous)) [8,8 26.953125x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-column.txt b/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-column.txt
index 541a3c148f0..5585f559ac4 100644
--- a/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-column.txt
+++ b/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-column.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid) [8,8 20x20] overflow: [8,8 38.953125x20]
         PaintableWithLines (BlockContainer<DIV>.whee) [8,8 20x20] overflow: [9,9 37.953125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-grid-2.txt b/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-grid-2.txt
index 52b5d13ece4..cb8e38cb3dd 100644
--- a/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-grid-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-grid-2.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.yeehaw) [50.953125,11 56.46875x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x31] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-grid.txt b/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-grid.txt
index 6502a0b838c..385bd7ad812 100644
--- a/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-grid.txt
+++ b/Tests/LibWeb/Layout/expected/grid/intrinsic-sized-grid.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid) [10,10 41.953125x22]
         PaintableWithLines (BlockContainer<DIV>.whee) [11,11 39.953125x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/intrinsic-sizing-should-account-for-gaps.txt b/Tests/LibWeb/Layout/expected/grid/intrinsic-sizing-should-account-for-gaps.txt
index c943a4c2b9c..be0d2a9b08d 100644
--- a/Tests/LibWeb/Layout/expected/grid/intrinsic-sizing-should-account-for-gaps.txt
+++ b/Tests/LibWeb/Layout/expected/grid/intrinsic-sizing-should-account-for-gaps.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>#wat) [0,18 216.09375x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-align-self-center-and-max-height.txt b/Tests/LibWeb/Layout/expected/grid/item-align-self-center-and-max-height.txt
index 45f436d15f7..4bd91e884e9 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-align-self-center-and-max-height.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-align-self-center-and-max-height.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid-container) [10,10 780x102] overflow: [11,10 778x102]
         PaintableWithLines (BlockContainer<DIV>#max-height-item.grid-item) [11,10 778x102]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-align-self-center-and-min-height.txt b/Tests/LibWeb/Layout/expected/grid/item-align-self-center-and-min-height.txt
index 15af11fc589..773ba4f09d9 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-align-self-center-and-min-height.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-align-self-center-and-min-height.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid-container) [10,10 780x304]
         PaintableWithLines (BlockContainer<DIV>#min-height-item.grid-item) [11,11 778x302]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x322] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-column-span-2.txt b/Tests/LibWeb/Layout/expected/grid/item-column-span-2.txt
index cffc3b1a37f..1aa81182799 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-column-span-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-column-span-2.txt
@@ -26,3 +26,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.item-right) [108.03125,8 683.96875x36]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-fit-content-width.txt b/Tests/LibWeb/Layout/expected/grid/item-fit-content-width.txt
index 6b7382c41d7..f5c723b5b08 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-fit-content-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-fit-content-width.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer<DIV>.w-fit) [41.71875,8 33.71875x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-max-width.txt b/Tests/LibWeb/Layout/expected/grid/item-max-width.txt
index e3dc578b9be..9ac969387d3 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-max-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-max-width.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableBox (Box<DIV>.app-privacy__cards) [8,8 784x100]
         PaintableWithLines (BlockContainer<DIV>.app-privacy__card) [8,8 392x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-min-width.txt b/Tests/LibWeb/Layout/expected/grid/item-min-width.txt
index e3dc578b9be..9ac969387d3 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-min-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-min-width.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableBox (Box<DIV>.app-privacy__cards) [8,8 784x100]
         PaintableWithLines (BlockContainer<DIV>.app-privacy__card) [8,8 392x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-span-exceeds-columns-size.txt b/Tests/LibWeb/Layout/expected/grid/item-span-exceeds-columns-size.txt
index cbb91894220..d88f0ad3ea7 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-span-exceeds-columns-size.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-span-exceeds-columns-size.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableBox (Box<DIV>.container) [8,8 300x100]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 300x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-with-box-sizing-border-box.txt b/Tests/LibWeb/Layout/expected/grid/item-with-box-sizing-border-box.txt
index ffb7577a917..0b60834b608 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-with-box-sizing-border-box.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-with-box-sizing-border-box.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.item) [400,11 389x22]
           PaintableWithLines (BlockContainer<DIV>) [501,12 187x20]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x42] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-with-min-content-width.txt b/Tests/LibWeb/Layout/expected/grid/item-with-min-content-width.txt
index b229aae943f..75c422b5dde 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-with-min-content-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-with-min-content-width.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.main) [8,8 100x18]
         PaintableWithLines (BlockContainer<DIV>.player) [8,8 100x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-with-min-width-and-place-self-start.txt b/Tests/LibWeb/Layout/expected/grid/item-with-min-width-and-place-self-start.txt
index c4d46fe7717..a8ad638bdce 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-with-min-width-and-place-self-start.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-with-min-width-and-place-self-start.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x216]
     PaintableBox (Box<BODY>) [8,8 784x200]
       PaintableBox (Box<SECTION>) [8,8 784x200]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/item-with-percentage-max-width.txt b/Tests/LibWeb/Layout/expected/grid/item-with-percentage-max-width.txt
index 94ce74ce853..5daf141e604 100644
--- a/Tests/LibWeb/Layout/expected/grid/item-with-percentage-max-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/item-with-percentage-max-width.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item) [289,29 160x63]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x121] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/items-min-content-size-should-account-paddings.txt b/Tests/LibWeb/Layout/expected/grid/items-min-content-size-should-account-paddings.txt
index 18a62160b13..c00952fadee 100644
--- a/Tests/LibWeb/Layout/expected/grid/items-min-content-size-should-account-paddings.txt
+++ b/Tests/LibWeb/Layout/expected/grid/items-min-content-size-should-account-paddings.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.w-layout-grid) [8,8 470.4375x118]
           PaintableWithLines (BlockContainer<DIV>.button) [8,8 235.21875x118]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x134] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/justify-content-cols.txt b/Tests/LibWeb/Layout/expected/grid/justify-content-cols.txt
index 378b775ee22..d1e7fb69d06 100644
--- a/Tests/LibWeb/Layout/expected/grid/justify-content-cols.txt
+++ b/Tests/LibWeb/Layout/expected/grid/justify-content-cols.txt
@@ -138,3 +138,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [370,248 60x20]
         PaintableWithLines (BlockContainer<DIV>) [581,248 60x20]
       PaintableWithLines (BlockContainer(anonymous)) [8,288 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x288] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/justify-content-fr.txt b/Tests/LibWeb/Layout/expected/grid/justify-content-fr.txt
index 4a31d4debf4..9b20195c9b0 100644
--- a/Tests/LibWeb/Layout/expected/grid/justify-content-fr.txt
+++ b/Tests/LibWeb/Layout/expected/grid/justify-content-fr.txt
@@ -131,3 +131,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.item) [30,192 90x30]
         PaintableWithLines (BlockContainer<DIV>.item) [135,192 90x30]
         PaintableWithLines (BlockContainer<DIV>.item) [240,192 90x30]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x252] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/justify-content.txt b/Tests/LibWeb/Layout/expected/grid/justify-content.txt
index 172aadba784..315fe4cfac2 100644
--- a/Tests/LibWeb/Layout/expected/grid/justify-content.txt
+++ b/Tests/LibWeb/Layout/expected/grid/justify-content.txt
@@ -124,3 +124,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [724.03125,116 67.96875x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,134 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x142] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/justify-items.txt b/Tests/LibWeb/Layout/expected/grid/justify-items.txt
index 1d19d241c54..ebe8f52dc50 100644
--- a/Tests/LibWeb/Layout/expected/grid/justify-items.txt
+++ b/Tests/LibWeb/Layout/expected/grid/justify-items.txt
@@ -63,3 +63,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [745.03125,99 43.96875x20]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,120 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x128] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/justify-self.txt b/Tests/LibWeb/Layout/expected/grid/justify-self.txt
index 071d9038a85..8be0dfe4c5a 100644
--- a/Tests/LibWeb/Layout/expected/grid/justify-self.txt
+++ b/Tests/LibWeb/Layout/expected/grid/justify-self.txt
@@ -47,3 +47,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>) [746.03125,90 43.96875x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/justify-start-min-width.txt b/Tests/LibWeb/Layout/expected/grid/justify-start-min-width.txt
index 797c37fdc44..6e79a53dd5c 100644
--- a/Tests/LibWeb/Layout/expected/grid/justify-start-min-width.txt
+++ b/Tests/LibWeb/Layout/expected/grid/justify-start-min-width.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>#grid) [8,8 784x18]
         PaintableWithLines (BlockContainer<A>#box) [8,8 288x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/line-based-placement-named-lines-with-span-negative.txt b/Tests/LibWeb/Layout/expected/grid/line-based-placement-named-lines-with-span-negative.txt
index 2ff82628981..58eeedbd29a 100644
--- a/Tests/LibWeb/Layout/expected/grid/line-based-placement-named-lines-with-span-negative.txt
+++ b/Tests/LibWeb/Layout/expected/grid/line-based-placement-named-lines-with-span-negative.txt
@@ -28,3 +28,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.box.b) [8,96 100x68]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x172] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/line-based-placement-named-lines-with-span.txt b/Tests/LibWeb/Layout/expected/grid/line-based-placement-named-lines-with-span.txt
index 449b22301ec..24390cbb8f8 100644
--- a/Tests/LibWeb/Layout/expected/grid/line-based-placement-named-lines-with-span.txt
+++ b/Tests/LibWeb/Layout/expected/grid/line-based-placement-named-lines-with-span.txt
@@ -52,3 +52,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.box.e) [8,164 430x68]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x240] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/line-based-with-repeat.txt b/Tests/LibWeb/Layout/expected/grid/line-based-with-repeat.txt
index 449b22301ec..24390cbb8f8 100644
--- a/Tests/LibWeb/Layout/expected/grid/line-based-with-repeat.txt
+++ b/Tests/LibWeb/Layout/expected/grid/line-based-with-repeat.txt
@@ -52,3 +52,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.box.e) [8,164 430x68]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x240] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/line-placement-with-repeat.txt b/Tests/LibWeb/Layout/expected/grid/line-placement-with-repeat.txt
index 6bd725fa155..0b6253e247b 100644
--- a/Tests/LibWeb/Layout/expected/grid/line-placement-with-repeat.txt
+++ b/Tests/LibWeb/Layout/expected/grid/line-placement-with-repeat.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 480x18]
           PaintableWithLines (BlockContainer<DIV>.box) [8,8 480x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/max-height-fit-content.txt b/Tests/LibWeb/Layout/expected/grid/max-height-fit-content.txt
index 1220890ad3a..b110bba14dc 100644
--- a/Tests/LibWeb/Layout/expected/grid/max-height-fit-content.txt
+++ b/Tests/LibWeb/Layout/expected/grid/max-height-fit-content.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [8,8 784x18]
       PaintableWithLines (BlockContainer(anonymous)) [8,8 784x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/max-width-grid-container-wrapper-in-max-content.txt b/Tests/LibWeb/Layout/expected/grid/max-width-grid-container-wrapper-in-max-content.txt
index 95affdd6918..69427dc62cc 100644
--- a/Tests/LibWeb/Layout/expected/grid/max-width-grid-container-wrapper-in-max-content.txt
+++ b/Tests/LibWeb/Layout/expected/grid/max-width-grid-container-wrapper-in-max-content.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [8,8 270x108]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer<DIV>) [8,116 270x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x124] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/min-height-from-text.txt b/Tests/LibWeb/Layout/expected/grid/min-height-from-text.txt
index 30bc98ab453..545496063e2 100644
--- a/Tests/LibWeb/Layout/expected/grid/min-height-from-text.txt
+++ b/Tests/LibWeb/Layout/expected/grid/min-height-from-text.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.footer) [8,62 784x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/min-max-content.txt b/Tests/LibWeb/Layout/expected/grid/min-max-content.txt
index e4575554ada..b2610652b19 100644
--- a/Tests/LibWeb/Layout/expected/grid/min-max-content.txt
+++ b/Tests/LibWeb/Layout/expected/grid/min-max-content.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item) [306.640625,8 485.359375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/minmax-1.txt b/Tests/LibWeb/Layout/expected/grid/minmax-1.txt
index 6218e7ac1ab..03c7512783d 100644
--- a/Tests/LibWeb/Layout/expected/grid/minmax-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/minmax-1.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.two) [308,8 300x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/minmax-2.txt b/Tests/LibWeb/Layout/expected/grid/minmax-2.txt
index 744a77f8949..865b5e2ef7c 100644
--- a/Tests/LibWeb/Layout/expected/grid/minmax-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/minmax-2.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.two) [308,8 300x50]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/minmax-3.txt b/Tests/LibWeb/Layout/expected/grid/minmax-3.txt
index 85cca8b4b3d..4e36d8577f6 100644
--- a/Tests/LibWeb/Layout/expected/grid/minmax-3.txt
+++ b/Tests/LibWeb/Layout/expected/grid/minmax-3.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.three) [500,8 292x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/minmax-auto-track-definition.txt b/Tests/LibWeb/Layout/expected/grid/minmax-auto-track-definition.txt
index c950c04257f..c7e313051e9 100644
--- a/Tests/LibWeb/Layout/expected/grid/minmax-auto-track-definition.txt
+++ b/Tests/LibWeb/Layout/expected/grid/minmax-auto-track-definition.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x200]
       PaintableBox (Box<DIV>.grid) [8,8 200x200]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/minmax-invalid-1.txt b/Tests/LibWeb/Layout/expected/grid/minmax-invalid-1.txt
index 7efecf49eab..b92b0f7dbce 100644
--- a/Tests/LibWeb/Layout/expected/grid/minmax-invalid-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/minmax-invalid-1.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.two) [8,26 784x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/minmax-non-token-contents-crash.txt b/Tests/LibWeb/Layout/expected/grid/minmax-non-token-contents-crash.txt
index c921381db9c..a14aa922885 100644
--- a/Tests/LibWeb/Layout/expected/grid/minmax-non-token-contents-crash.txt
+++ b/Tests/LibWeb/Layout/expected/grid/minmax-non-token-contents-crash.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,16 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/minmax-with-max-function-inside.txt b/Tests/LibWeb/Layout/expected/grid/minmax-with-max-function-inside.txt
index d887f96f0d0..ef3187993e3 100644
--- a/Tests/LibWeb/Layout/expected/grid/minmax-with-max-function-inside.txt
+++ b/Tests/LibWeb/Layout/expected/grid/minmax-with-max-function-inside.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [8,26 261.328125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/minmax-with-percentage-max.txt b/Tests/LibWeb/Layout/expected/grid/minmax-with-percentage-max.txt
index 340c82c1719..606f3071394 100644
--- a/Tests/LibWeb/Layout/expected/grid/minmax-with-percentage-max.txt
+++ b/Tests/LibWeb/Layout/expected/grid/minmax-with-percentage-max.txt
@@ -5,3 +5,6 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableBox (Box<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 184x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for Box<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/negative-grid-item-column-index.txt b/Tests/LibWeb/Layout/expected/grid/negative-grid-item-column-index.txt
index c47abfb3398..36adefd42ce 100644
--- a/Tests/LibWeb/Layout/expected/grid/negative-grid-item-column-index.txt
+++ b/Tests/LibWeb/Layout/expected/grid/negative-grid-item-column-index.txt
@@ -84,3 +84,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.f) [204.453125,62 196x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,80 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x88] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/order.txt b/Tests/LibWeb/Layout/expected/grid/order.txt
index e26c6929f9c..fa7dd8fc615 100644
--- a/Tests/LibWeb/Layout/expected/grid/order.txt
+++ b/Tests/LibWeb/Layout/expected/grid/order.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.grid-item.item-3) [11,11 102x102]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,114 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x122] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/place-items-center-nested-grids.txt b/Tests/LibWeb/Layout/expected/grid/place-items-center-nested-grids.txt
index e8906f87ceb..3f558140171 100644
--- a/Tests/LibWeb/Layout/expected/grid/place-items-center-nested-grids.txt
+++ b/Tests/LibWeb/Layout/expected/grid/place-items-center-nested-grids.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>) [8,8 784x90]
         PaintableWithLines (BlockContainer(anonymous)) [8,8 65.328125x90] overflow: [8,8 80.234375x90]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x106] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/place-items-center.txt b/Tests/LibWeb/Layout/expected/grid/place-items-center.txt
index 5f51964889f..e481e867192 100644
--- a/Tests/LibWeb/Layout/expected/grid/place-items-center.txt
+++ b/Tests/LibWeb/Layout/expected/grid/place-items-center.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableBox (Box<BODY>) [9,9 782x22]
       PaintableWithLines (BlockContainer<DIV>) [361.9375,10 76.125x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/place-self.txt b/Tests/LibWeb/Layout/expected/grid/place-self.txt
index 8168e6a0770..17584e94f8f 100644
--- a/Tests/LibWeb/Layout/expected/grid/place-self.txt
+++ b/Tests/LibWeb/Layout/expected/grid/place-self.txt
@@ -53,3 +53,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item-padding) [388.765625,195 380.234375x40]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x264] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-1.txt b/Tests/LibWeb/Layout/expected/grid/placement-1.txt
index 8eaae60acc1..63a2b2208fd 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-1.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.b) [529.625,11 259.3125x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-10.txt b/Tests/LibWeb/Layout/expected/grid/placement-10.txt
index f1452999fa3..0ddcea97f4d 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-10.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-10.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>#d) [108,208 100x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x516] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-2.txt b/Tests/LibWeb/Layout/expected/grid/placement-2.txt
index 5e05de4d2df..6e50e6ff0d0 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-2.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item.b) [270.3125,11 518.625x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-3.txt b/Tests/LibWeb/Layout/expected/grid/placement-3.txt
index 220defb0b7c..4bdb4ea6493 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-3.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-3.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.b) [11,51 778x60]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-4.txt b/Tests/LibWeb/Layout/expected/grid/placement-4.txt
index 9c1be42272e..7465270bf52 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-4.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-4.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [11,31 389x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-5.txt b/Tests/LibWeb/Layout/expected/grid/placement-5.txt
index c280af3c2a7..b7fb3247741 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-5.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-5.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>#b) [111,111 100x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-6.txt b/Tests/LibWeb/Layout/expected/grid/placement-6.txt
index 4cfba7bb57a..2a65c1c054e 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-6.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-6.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>#b) [111,111 100x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-7.txt b/Tests/LibWeb/Layout/expected/grid/placement-7.txt
index c72571f4040..a8b2d3695fe 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-7.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-7.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>#d) [495.453125,108 296.546875x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-8.txt b/Tests/LibWeb/Layout/expected/grid/placement-8.txt
index a9d62a9bf7c..e974de8131a 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-8.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-8.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>#d) [111,403 100x108]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x520] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-9.txt b/Tests/LibWeb/Layout/expected/grid/placement-9.txt
index f1452999fa3..0ddcea97f4d 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-9.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-9.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>#d) [108,208 100x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x516] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-auto-negative.txt b/Tests/LibWeb/Layout/expected/grid/placement-auto-negative.txt
index 2e3ed4e825a..7168e6cf58d 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-auto-negative.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-auto-negative.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.b) [8,8 48x48]
         PaintableWithLines (BlockContainer<DIV>.c) [56,8 48x48]
       PaintableWithLines (BlockContainer(anonymous)) [8,56 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x64] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-1.txt b/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-1.txt
index 45a3f89e566..518b18cd05e 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-1.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.b) [398.765625,11 390.234375x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-2.txt b/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-2.txt
index 8d6c32e48ac..9fc5523a30a 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-2.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item.d) [270.328125,61 518.65625x25]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x95] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-3.txt b/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-3.txt
index e79d50cef84..de3ce4d9e44 100644
--- a/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-3.txt
+++ b/Tests/LibWeb/Layout/expected/grid/placement-using-named-tracks-3.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>) [11,31 50x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/relative-position-grid-item-with-percentage-insets.txt b/Tests/LibWeb/Layout/expected/grid/relative-position-grid-item-with-percentage-insets.txt
index 1f6df1c6e17..46004796431 100644
--- a/Tests/LibWeb/Layout/expected/grid/relative-position-grid-item-with-percentage-insets.txt
+++ b/Tests/LibWeb/Layout/expected/grid/relative-position-grid-item-with-percentage-insets.txt
@@ -52,3 +52,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [212.4375,227.5 48.125x18]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,310 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x318] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/relpos-grid-item.txt b/Tests/LibWeb/Layout/expected/grid/relpos-grid-item.txt
index aebc6a98cfa..41311d2f675 100644
--- a/Tests/LibWeb/Layout/expected/grid/relpos-grid-item.txt
+++ b/Tests/LibWeb/Layout/expected/grid/relpos-grid-item.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.athena) [22,24 204x22]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [2,2 796x64] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/repeat-auto-fit-fill-cannot-have-auto.txt b/Tests/LibWeb/Layout/expected/grid/repeat-auto-fit-fill-cannot-have-auto.txt
index 5eb85b5e701..1817214f503 100644
--- a/Tests/LibWeb/Layout/expected/grid/repeat-auto-fit-fill-cannot-have-auto.txt
+++ b/Tests/LibWeb/Layout/expected/grid/repeat-auto-fit-fill-cannot-have-auto.txt
@@ -60,3 +60,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/repeat-non-token-contents-crash.txt b/Tests/LibWeb/Layout/expected/grid/repeat-non-token-contents-crash.txt
index c921381db9c..a14aa922885 100644
--- a/Tests/LibWeb/Layout/expected/grid/repeat-non-token-contents-crash.txt
+++ b/Tests/LibWeb/Layout/expected/grid/repeat-non-token-contents-crash.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,16 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/repeat.txt b/Tests/LibWeb/Layout/expected/grid/repeat.txt
index 5f918e511af..a96fc5b4644 100644
--- a/Tests/LibWeb/Layout/expected/grid/repeat.txt
+++ b/Tests/LibWeb/Layout/expected/grid/repeat.txt
@@ -98,3 +98,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item) [208,208 100x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x234] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/replaced-item-1.txt b/Tests/LibWeb/Layout/expected/grid/replaced-item-1.txt
index 6153c3749bb..e75446d8d61 100644
--- a/Tests/LibWeb/Layout/expected/grid/replaced-item-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/replaced-item-1.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x500]
       PaintableBox (Box<DIV>.grid) [8,8 100x500] overflow: [8,8 500x500]
         ImagePaintable (ImageBox<IMG>) [8,8 500x500]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x516] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/replaced-item-2.txt b/Tests/LibWeb/Layout/expected/grid/replaced-item-2.txt
index 1eb67f9cbc8..4edcb1ba4d4 100644
--- a/Tests/LibWeb/Layout/expected/grid/replaced-item-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/replaced-item-2.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 100x100]
       PaintableBox (Box<DIV>.img-wrapper) [8,8 100x100]
         ImagePaintable (ImageBox<IMG>) [8,8 10x10]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/restart-fr-algorithm-if-less-than-base-size.txt b/Tests/LibWeb/Layout/expected/grid/restart-fr-algorithm-if-less-than-base-size.txt
index 89ad40d311e..be99273393c 100644
--- a/Tests/LibWeb/Layout/expected/grid/restart-fr-algorithm-if-less-than-base-size.txt
+++ b/Tests/LibWeb/Layout/expected/grid/restart-fr-algorithm-if-less-than-base-size.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.nowrap) [8,8 202.5x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>) [210.5,8 0x18]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/row-1fr.txt b/Tests/LibWeb/Layout/expected/grid/row-1fr.txt
index a355fd14f42..5e6966a227a 100644
--- a/Tests/LibWeb/Layout/expected/grid/row-1fr.txt
+++ b/Tests/LibWeb/Layout/expected/grid/row-1fr.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x72]
     PaintableBox (Box<BODY>) [9,9 202x54]
       PaintableWithLines (BlockContainer<DIV>.item) [10,10 102x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/row-gaps-with-overflowing-spans-crash.txt b/Tests/LibWeb/Layout/expected/grid/row-gaps-with-overflowing-spans-crash.txt
index 87f87b4f544..806c01bb0b6 100644
--- a/Tests/LibWeb/Layout/expected/grid/row-gaps-with-overflowing-spans-crash.txt
+++ b/Tests/LibWeb/Layout/expected/grid/row-gaps-with-overflowing-spans-crash.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [8,24 784x32]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,56 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x64] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/row-height.txt b/Tests/LibWeb/Layout/expected/grid/row-height.txt
index d5be9c08f30..00bcd047d75 100644
--- a/Tests/LibWeb/Layout/expected/grid/row-height.txt
+++ b/Tests/LibWeb/Layout/expected/grid/row-height.txt
@@ -41,3 +41,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item) [400.140625,58 391.859375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x84] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/row-span-2-maxcontent.txt b/Tests/LibWeb/Layout/expected/grid/row-span-2-maxcontent.txt
index ef90d3bf8d6..55bf20dd976 100644
--- a/Tests/LibWeb/Layout/expected/grid/row-span-2-maxcontent.txt
+++ b/Tests/LibWeb/Layout/expected/grid/row-span-2-maxcontent.txt
@@ -85,3 +85,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item.item-span-two) [8,8 393.46875x324]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x340] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/row-span-2-mincontent.txt b/Tests/LibWeb/Layout/expected/grid/row-span-2-mincontent.txt
index 54c071e3848..25e31a0633f 100644
--- a/Tests/LibWeb/Layout/expected/grid/row-span-2-mincontent.txt
+++ b/Tests/LibWeb/Layout/expected/grid/row-span-2-mincontent.txt
@@ -139,3 +139,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item.item-span-two) [8,8 100.640625x576]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x592] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/row-span-2-with-gaps.txt b/Tests/LibWeb/Layout/expected/grid/row-span-2-with-gaps.txt
index 760c9a28d2a..d6492fd9e6f 100644
--- a/Tests/LibWeb/Layout/expected/grid/row-span-2-with-gaps.txt
+++ b/Tests/LibWeb/Layout/expected/grid/row-span-2-with-gaps.txt
@@ -87,3 +87,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item.item-span-two) [8,8 383.46875x342]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x358] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/row-span-2.txt b/Tests/LibWeb/Layout/expected/grid/row-span-2.txt
index ef90d3bf8d6..55bf20dd976 100644
--- a/Tests/LibWeb/Layout/expected/grid/row-span-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/row-span-2.txt
@@ -85,3 +85,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.grid-item.item-span-two) [8,8 393.46875x324]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x340] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/rows-1fr-1fr.txt b/Tests/LibWeb/Layout/expected/grid/rows-1fr-1fr.txt
index 4deb1eecba6..c86c964123e 100644
--- a/Tests/LibWeb/Layout/expected/grid/rows-1fr-1fr.txt
+++ b/Tests/LibWeb/Layout/expected/grid/rows-1fr-1fr.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.item) [8,8 784x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/should-not-cause-infinite-spinning-in-space-distribution.txt b/Tests/LibWeb/Layout/expected/grid/should-not-cause-infinite-spinning-in-space-distribution.txt
index 32f0feb9f51..ddc6000bf18 100644
--- a/Tests/LibWeb/Layout/expected/grid/should-not-cause-infinite-spinning-in-space-distribution.txt
+++ b/Tests/LibWeb/Layout/expected/grid/should-not-cause-infinite-spinning-in-space-distribution.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.bar) [10,30 780x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x58] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/should-not-hang-in-size-distribution.txt b/Tests/LibWeb/Layout/expected/grid/should-not-hang-in-size-distribution.txt
index 207e686fbc3..72eab7c1e49 100644
--- a/Tests/LibWeb/Layout/expected/grid/should-not-hang-in-size-distribution.txt
+++ b/Tests/LibWeb/Layout/expected/grid/should-not-hang-in-size-distribution.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#item) [8,8 783.984375x18]
         PaintableWithLines (BlockContainer<DIV>#block) [8,8 783.984375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/stretch-auto-tracks.txt b/Tests/LibWeb/Layout/expected/grid/stretch-auto-tracks.txt
index b2680de7a6f..7b7f31ad903 100644
--- a/Tests/LibWeb/Layout/expected/grid/stretch-auto-tracks.txt
+++ b/Tests/LibWeb/Layout/expected/grid/stretch-auto-tracks.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<SECTION>) [8,8 784x100]
         PaintableWithLines (BlockContainer<DIV>#one) [8,8 784x0]
         PaintableWithLines (BlockContainer<DIV>#two) [8,8 784x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/template-areas-1.txt b/Tests/LibWeb/Layout/expected/grid/template-areas-1.txt
index 2119f09e67a..d9d8e570f51 100644
--- a/Tests/LibWeb/Layout/expected/grid/template-areas-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/template-areas-1.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.b) [11,211 300x100]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x320] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/template-areas-2.txt b/Tests/LibWeb/Layout/expected/grid/template-areas-2.txt
index 97563fb460d..006927ecc48 100644
--- a/Tests/LibWeb/Layout/expected/grid/template-areas-2.txt
+++ b/Tests/LibWeb/Layout/expected/grid/template-areas-2.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.b) [211,11 100x300]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x320] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/template-areas-3.txt b/Tests/LibWeb/Layout/expected/grid/template-areas-3.txt
index a1024256789..be890af413c 100644
--- a/Tests/LibWeb/Layout/expected/grid/template-areas-3.txt
+++ b/Tests/LibWeb/Layout/expected/grid/template-areas-3.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x694]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.e) [529.65625,515 259.328125x168]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x692] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/template-lines-and-areas.txt b/Tests/LibWeb/Layout/expected/grid/template-lines-and-areas.txt
index 41b0ff229dc..6cffbd42331 100644
--- a/Tests/LibWeb/Layout/expected/grid/template-lines-and-areas.txt
+++ b/Tests/LibWeb/Layout/expected/grid/template-lines-and-areas.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.item-right) [269.328125,8 522.65625x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/track-size-calc-with-percentage.txt b/Tests/LibWeb/Layout/expected/grid/track-size-calc-with-percentage.txt
index 41c7d619740..e5b5e0635e9 100644
--- a/Tests/LibWeb/Layout/expected/grid/track-size-calc-with-percentage.txt
+++ b/Tests/LibWeb/Layout/expected/grid/track-size-calc-with-percentage.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.ipc-sub-grid) [8,8 401.28125x18]
           PaintableWithLines (BlockContainer(anonymous)) [8,8 401.28125x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/two-items-spanning-one-1fr-row.txt b/Tests/LibWeb/Layout/expected/grid/two-items-spanning-one-1fr-row.txt
index b52f6d476aa..78a35ab7a2c 100644
--- a/Tests/LibWeb/Layout/expected/grid/two-items-spanning-one-1fr-row.txt
+++ b/Tests/LibWeb/Layout/expected/grid/two-items-spanning-one-1fr-row.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.bar) [10,10 780x102]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/unresolvable-percentage-track.txt b/Tests/LibWeb/Layout/expected/grid/unresolvable-percentage-track.txt
index 0bcd11e8722..0a27c75f797 100644
--- a/Tests/LibWeb/Layout/expected/grid/unresolvable-percentage-track.txt
+++ b/Tests/LibWeb/Layout/expected/grid/unresolvable-percentage-track.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.ipc-sub-grid) [8,8 36.84375x18]
           PaintableWithLines (BlockContainer<DIV>) [8,8 36.84375x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/valid-grid-areas-1.txt b/Tests/LibWeb/Layout/expected/grid/valid-grid-areas-1.txt
index adbaf450f9f..133b7631030 100644
--- a/Tests/LibWeb/Layout/expected/grid/valid-grid-areas-1.txt
+++ b/Tests/LibWeb/Layout/expected/grid/valid-grid-areas-1.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.grid-container) [8,8 784x18]
         PaintableWithLines (BlockContainer<DIV>.grid-item) [8,8 392x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/grid/vertical-margins-auto.txt b/Tests/LibWeb/Layout/expected/grid/vertical-margins-auto.txt
index fb674385d8a..233b1951ab9 100644
--- a/Tests/LibWeb/Layout/expected/grid/vertical-margins-auto.txt
+++ b/Tests/LibWeb/Layout/expected/grid/vertical-margins-auto.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.container) [10,10 502x502]
         PaintableWithLines (BlockContainer<DIV>.item) [243.828125,251 34.34375x20]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x520] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/height-min-max-fit-content.txt b/Tests/LibWeb/Layout/expected/height-min-max-fit-content.txt
index 0b17b2784cd..90f04a0978d 100644
--- a/Tests/LibWeb/Layout/expected/height-min-max-fit-content.txt
+++ b/Tests/LibWeb/Layout/expected/height-min-max-fit-content.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       ImagePaintable (ImageBox<IMG>.max) [136,8 120x120]
       TextPaintable (TextNode<#text>)
       ImagePaintable (ImageBox<IMG>.fit) [264,8 120x120]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x140] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/height-of-absolute-position-box-with-padding.txt b/Tests/LibWeb/Layout/expected/height-of-absolute-position-box-with-padding.txt
index 942a2d211e7..65c81d6f73a 100644
--- a/Tests/LibWeb/Layout/expected/height-of-absolute-position-box-with-padding.txt
+++ b/Tests/LibWeb/Layout/expected/height-of-absolute-position-box-with-padding.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<H1>) [75.59375,58.765625 128x128]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/hidden-root-element.txt b/Tests/LibWeb/Layout/expected/hidden-root-element.txt
index fe53551f0bb..779bb7fbfcb 100644
--- a/Tests/LibWeb/Layout/expected/hidden-root-element.txt
+++ b/Tests/LibWeb/Layout/expected/hidden-root-element.txt
@@ -1,3 +1,5 @@
 Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
+
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/hide-audio-based-on-controls.txt b/Tests/LibWeb/Layout/expected/hide-audio-based-on-controls.txt
index 48b48f86685..552d78726c5 100644
--- a/Tests/LibWeb/Layout/expected/hide-audio-based-on-controls.txt
+++ b/Tests/LibWeb/Layout/expected/hide-audio-based-on-controls.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       AudioPaintable (AudioBox<AUDIO>) [8,8 300x40]
       TextPaintable (TextNode<#text>)
       AudioPaintable (AudioBox<AUDIO>) [316,48 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x60] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/host-pseudo-class-basic.txt b/Tests/LibWeb/Layout/expected/host-pseudo-class-basic.txt
index 59e4eb9abb6..c8097edd3f5 100644
--- a/Tests/LibWeb/Layout/expected/host-pseudo-class-basic.txt
+++ b/Tests/LibWeb/Layout/expected/host-pseudo-class-basic.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [8,8 373.96875x48]
           PaintableWithLines (InlineNode<SPAN>) [23,23 343.96875x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x64] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/html-dimensions.txt b/Tests/LibWeb/Layout/expected/html-dimensions.txt
index 2b1d8f9893b..501f548c044 100644
--- a/Tests/LibWeb/Layout/expected/html-dimensions.txt
+++ b/Tests/LibWeb/Layout/expected/html-dimensions.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x736]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x720]
       VideoPaintable (VideoBox<VIDEO>) [8,8 320x240]
       VideoPaintable (VideoBox<VIDEO>) [8,248 640x480]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x736] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/html-display-contents.txt b/Tests/LibWeb/Layout/expected/html-display-contents.txt
index 8239563f026..b98f60debae 100644
--- a/Tests/LibWeb/Layout/expected/html-display-contents.txt
+++ b/Tests/LibWeb/Layout/expected/html-display-contents.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/html-display-inline.txt b/Tests/LibWeb/Layout/expected/html-display-inline.txt
index 8239563f026..b98f60debae 100644
--- a/Tests/LibWeb/Layout/expected/html-display-inline.txt
+++ b/Tests/LibWeb/Layout/expected/html-display-inline.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/html-encoding-detection-crash.txt b/Tests/LibWeb/Layout/expected/html-encoding-detection-crash.txt
index f5204a0f463..b82351efddb 100644
--- a/Tests/LibWeb/Layout/expected/html-encoding-detection-crash.txt
+++ b/Tests/LibWeb/Layout/expected/html-encoding-detection-crash.txt
@@ -5,3 +5,6 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/image-display-block-margin-auto.txt b/Tests/LibWeb/Layout/expected/image-display-block-margin-auto.txt
index 562e9d47a21..c1ef5f15f0d 100644
--- a/Tests/LibWeb/Layout/expected/image-display-block-margin-auto.txt
+++ b/Tests/LibWeb/Layout/expected/image-display-block-margin-auto.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x116]
     PaintableWithLines (BlockContainer<BODY>) [8,8 400x100]
       ImagePaintable (ImageBox<IMG>) [158,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/image-with-multiple-constraint-violations.txt b/Tests/LibWeb/Layout/expected/image-with-multiple-constraint-violations.txt
index cc803399dbb..a0710b580f8 100644
--- a/Tests/LibWeb/Layout/expected/image-with-multiple-constraint-violations.txt
+++ b/Tests/LibWeb/Layout/expected/image-with-multiple-constraint-violations.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x82]
     PaintableWithLines (BlockContainer<BODY>) [9,9 782x64]
       ImagePaintable (ImageBox<IMG>) [10,10 82x62]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x80] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/img-with-box-sizing-border-box-and-padding.txt b/Tests/LibWeb/Layout/expected/img-with-box-sizing-border-box-and-padding.txt
index b198a99d5fa..f6a88ca40e3 100644
--- a/Tests/LibWeb/Layout/expected/img-with-box-sizing-border-box-and-padding.txt
+++ b/Tests/LibWeb/Layout/expected/img-with-box-sizing-border-box-and-padding.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       ImagePaintable (ImageBox<IMG>.with-height) [8,8 100x100]
       ImagePaintable (ImageBox<IMG>.with-width) [108,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-indefinite-containing-block-width.txt b/Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-indefinite-containing-block-width.txt
index 005a12964e8..c83d60ba0a7 100644
--- a/Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-indefinite-containing-block-width.txt
+++ b/Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-indefinite-containing-block-width.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 120x120]
       PaintableWithLines (BlockContainer<DIV>) [8,8 120x120]
         ImagePaintable (ImageBox<IMG>) [8,8 120x120]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-min-content-containing-block-width.txt b/Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-min-content-containing-block-width.txt
index 8ce2fdd7bea..930b26f04fa 100644
--- a/Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-min-content-containing-block-width.txt
+++ b/Tests/LibWeb/Layout/expected/img-with-percentage-max-width-and-min-content-containing-block-width.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 0x18]
       ImagePaintable (ImageBox<IMG>) [8,21 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/import-after-namespace.txt b/Tests/LibWeb/Layout/expected/import-after-namespace.txt
index 749f46a5c9d..94f6a9619e5 100644
--- a/Tests/LibWeb/Layout/expected/import-after-namespace.txt
+++ b/Tests/LibWeb/Layout/expected/import-after-namespace.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer(anonymous)) [8,450 784x0]
       PaintableWithLines (BlockContainer<PRE>#out) [8,463 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,463 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x463] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/import-from-linked-style-sheet.txt b/Tests/LibWeb/Layout/expected/import-from-linked-style-sheet.txt
index e02f7284ef7..cc5ec502d28 100644
--- a/Tests/LibWeb/Layout/expected/import-from-linked-style-sheet.txt
+++ b/Tests/LibWeb/Layout/expected/import-from-linked-style-sheet.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#target) [8,8 200x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/incomplete-input-no-newline-at-eof-should-not-crash.txt b/Tests/LibWeb/Layout/expected/incomplete-input-no-newline-at-eof-should-not-crash.txt
index d4c45936652..a8a8ce2fbcb 100644
--- a/Tests/LibWeb/Layout/expected/incomplete-input-no-newline-at-eof-should-not-crash.txt
+++ b/Tests/LibWeb/Layout/expected/incomplete-input-no-newline-at-eof-should-not-crash.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/inline-block-treat-100pct-width-as-auto.txt b/Tests/LibWeb/Layout/expected/inline-block-treat-100pct-width-as-auto.txt
index 04755817a42..1536633a574 100644
--- a/Tests/LibWeb/Layout/expected/inline-block-treat-100pct-width-as-auto.txt
+++ b/Tests/LibWeb/Layout/expected/inline-block-treat-100pct-width-as-auto.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>.first) [11,11 104.484375x20]
             TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.second) [11,31 52x52]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x83] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/inline-flex-with-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/inline-flex-with-aspect-ratio.txt
index 85a57c3fec9..37c1bf30175 100644
--- a/Tests/LibWeb/Layout/expected/inline-flex-with-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/inline-flex-with-aspect-ratio.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>.inline-flex.aspect-ratio) [8,8 10x10.3125] overflow: [8,8 10x13]
         PaintableWithLines (BlockContainer<DIV>.img-wrapper) [8,8 10x10.3125] overflow: [8,8 10x13]
           ImagePaintable (ImageBox<IMG>) [8,11 10x10]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/inline-fragment-ordering-flakiness.txt b/Tests/LibWeb/Layout/expected/inline-fragment-ordering-flakiness.txt
index fc6b6d9ad5f..03b43f4802b 100644
--- a/Tests/LibWeb/Layout/expected/inline-fragment-ordering-flakiness.txt
+++ b/Tests/LibWeb/Layout/expected/inline-fragment-ordering-flakiness.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<MAIN>) [8,0 36.84375x18]
         PaintableWithLines (BlockContainer<DIV>) [8,0 36.84375x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/inline-size.txt b/Tests/LibWeb/Layout/expected/inline-size.txt
index 628cf9bd0d4..1e209e39e48 100644
--- a/Tests/LibWeb/Layout/expected/inline-size.txt
+++ b/Tests/LibWeb/Layout/expected/inline-size.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x1060]
       PaintableWithLines (BlockContainer<P>.inline-size-test) [8,790 400x200]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,1060 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x1060] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-as-button-align-center.txt b/Tests/LibWeb/Layout/expected/input-as-button-align-center.txt
index 588f5e64c90..94ed4ba02d8 100644
--- a/Tests/LibWeb/Layout/expected/input-as-button-align-center.txt
+++ b/Tests/LibWeb/Layout/expected/input-as-button-align-center.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<SPAN>) [36.75,149.5 242.5x17]
               TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,308 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x316] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-as-button-shrink-to-fit.txt b/Tests/LibWeb/Layout/expected/input-as-button-shrink-to-fit.txt
index 7eb3277e2ff..5fd5fd3f16e 100644
--- a/Tests/LibWeb/Layout/expected/input-as-button-shrink-to-fit.txt
+++ b/Tests/LibWeb/Layout/expected/input-as-button-shrink-to-fit.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<SPAN>) [13,17.5 195.796875x17]
               TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-element-with-display-inline.txt b/Tests/LibWeb/Layout/expected/input-element-with-display-inline.txt
index cce495218e1..8d3954b3abd 100644
--- a/Tests/LibWeb/Layout/expected/input-element-with-display-inline.txt
+++ b/Tests/LibWeb/Layout/expected/input-element-with-display-inline.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<INPUT>) [10,10 202x27]
         PaintableBox (Box<DIV>) [11,11 200x25]
           PaintableWithLines (BlockContainer<DIV>) [13,12 196x23]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x45] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-file.txt b/Tests/LibWeb/Layout/expected/input-file.txt
index 42320056d63..427db14a0bc 100644
--- a/Tests/LibWeb/Layout/expected/input-file.txt
+++ b/Tests/LibWeb/Layout/expected/input-file.txt
@@ -78,3 +78,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               TextPaintable (TextNode<#text>)
         PaintableWithLines (Label<LABEL>) [629.71875,10 141.625x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-image-to-text.txt b/Tests/LibWeb/Layout/expected/input-image-to-text.txt
index 03fcc10b198..7caca7cc742 100644
--- a/Tests/LibWeb/Layout/expected/input-image-to-text.txt
+++ b/Tests/LibWeb/Layout/expected/input-image-to-text.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>) [9,9 200x20]
           PaintableWithLines (BlockContainer<DIV>) [11,10 196x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-image.txt b/Tests/LibWeb/Layout/expected/input-image.txt
index ceacaf43dea..d258a6cb165 100644
--- a/Tests/LibWeb/Layout/expected/input-image.txt
+++ b/Tests/LibWeb/Layout/expected/input-image.txt
@@ -41,3 +41,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [8,8 784x0]
             PaintableWithLines (BlockContainer(anonymous)) [8,8 0x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,268 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x276] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-password-to-text.txt b/Tests/LibWeb/Layout/expected/input-password-to-text.txt
index fca19c97447..4f8faa2d2ea 100644
--- a/Tests/LibWeb/Layout/expected/input-password-to-text.txt
+++ b/Tests/LibWeb/Layout/expected/input-password-to-text.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>) [9,9 200x20]
           PaintableWithLines (BlockContainer<DIV>) [11,10 196x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-placeholder-with-line-height.txt b/Tests/LibWeb/Layout/expected/input-placeholder-with-line-height.txt
index 3886adc2caf..09e8c8a7f3e 100644
--- a/Tests/LibWeb/Layout/expected/input-placeholder-with-line-height.txt
+++ b/Tests/LibWeb/Layout/expected/input-placeholder-with-line-height.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer<DIV>) [109,9 98x80]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x100] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-placeholder.txt b/Tests/LibWeb/Layout/expected/input-placeholder.txt
index 4e185d97e2b..9559a434ea1 100644
--- a/Tests/LibWeb/Layout/expected/input-placeholder.txt
+++ b/Tests/LibWeb/Layout/expected/input-placeholder.txt
@@ -66,3 +66,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>) [11,37 196x23] overflow: [11,37 407.859375x23]
             TextPaintable (TextNode<#text>)
           PaintableWithLines (BlockContainer<DIV>) [207,37 0x23]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x70] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-range.txt b/Tests/LibWeb/Layout/expected/input-range.txt
index fe7a72fdea8..922f55bd55b 100644
--- a/Tests/LibWeb/Layout/expected/input-range.txt
+++ b/Tests/LibWeb/Layout/expected/input-range.txt
@@ -24,3 +24,8 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [208,15 202x6] overflow: [209,10 200x16]
           PaintableWithLines (BlockContainer<DIV>) [209,16 20x4]
           PaintableWithLines (BlockContainer<DIV>) [229,10 16x16]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x39] [children: 2] (z-index: auto)
+  SC for BlockContainer<DIV> [109,10 16x16] [children: 0] (z-index: 1), transform: [1 0 0 1 -8 0]
+  SC for BlockContainer<DIV> [229,10 16x16] [children: 0] (z-index: 1), transform: [1 0 0 1 -8 0]
diff --git a/Tests/LibWeb/Layout/expected/input-text-node-invalidation-on-value-change.txt b/Tests/LibWeb/Layout/expected/input-text-node-invalidation-on-value-change.txt
index cfd93910309..dfba4c343b2 100644
--- a/Tests/LibWeb/Layout/expected/input-text-node-invalidation-on-value-change.txt
+++ b/Tests/LibWeb/Layout/expected/input-text-node-invalidation-on-value-change.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>) [9,9 200x25]
           PaintableWithLines (BlockContainer<DIV>) [11,10 196x23]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x43] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-text-to-image.txt b/Tests/LibWeb/Layout/expected/input-text-to-image.txt
index 9bd1d1c4a74..c6f74ddd631 100644
--- a/Tests/LibWeb/Layout/expected/input-text-to-image.txt
+++ b/Tests/LibWeb/Layout/expected/input-text-to-image.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       ImagePaintable (ImageBox<INPUT>) [8,8 120x120]
         PaintableWithLines (BlockContainer(anonymous)) [8,8 784x0]
           PaintableWithLines (BlockContainer(anonymous)) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/input-text-to-password.txt b/Tests/LibWeb/Layout/expected/input-text-to-password.txt
index 5733ead7567..06ab9634518 100644
--- a/Tests/LibWeb/Layout/expected/input-text-to-password.txt
+++ b/Tests/LibWeb/Layout/expected/input-text-to-password.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>) [9,9 200x20]
           PaintableWithLines (BlockContainer<DIV>) [11,10 196x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/inset-shorthand-property.txt b/Tests/LibWeb/Layout/expected/inset-shorthand-property.txt
index 2f0cb7c05fe..5ac9062c569 100644
--- a/Tests/LibWeb/Layout/expected/inset-shorthand-property.txt
+++ b/Tests/LibWeb/Layout/expected/inset-shorthand-property.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.good) [38,18 150x150]
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/inside-list-item-content-offset.txt b/Tests/LibWeb/Layout/expected/inside-list-item-content-offset.txt
index 2084a3ac038..ab0ae9b20d5 100644
--- a/Tests/LibWeb/Layout/expected/inside-list-item-content-offset.txt
+++ b/Tests/LibWeb/Layout/expected/inside-list-item-content-offset.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (ListItemBox<SPAN>) [232,200 360x17] overflow: [208,200 384x17.5]
         MarkerPaintable (ListItemMarkerBox(anonymous)) [208,200.5 12x17]
       PaintableWithLines (BlockContainer(anonymous)) [8,400 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x417] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/justify-content-flex-start.txt b/Tests/LibWeb/Layout/expected/justify-content-flex-start.txt
index 5ea14bb0ab4..bbe5ad36393 100644
--- a/Tests/LibWeb/Layout/expected/justify-content-flex-start.txt
+++ b/Tests/LibWeb/Layout/expected/justify-content-flex-start.txt
@@ -72,3 +72,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer(anonymous)) [253.625,149 8.734375x18]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/layout-tree-update/dialog-backdrop-update.txt b/Tests/LibWeb/Layout/expected/layout-tree-update/dialog-backdrop-update.txt
index 4741ec91c85..f66522c5fb9 100644
--- a/Tests/LibWeb/Layout/expected/layout-tree-update/dialog-backdrop-update.txt
+++ b/Tests/LibWeb/Layout/expected/layout-tree-update/dialog-backdrop-update.txt
@@ -24,3 +24,8 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<DIV>#inner) [395.140625,291 9.703125x18]
       TextPaintable (TextNode<#text>)
     PaintableWithLines (BlockContainer(anonymous)) [395.140625,309 9.703125x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 3] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
+ SC for BlockContainer(anonymous) [0,0 800x600] [children: 0] (z-index: auto)
+ SC for BlockContainer<DIALOG>#dialog [395.140625,291 9.703125x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/layout-tree-update/inline-element-position-change.txt b/Tests/LibWeb/Layout/expected/layout-tree-update/inline-element-position-change.txt
index 6a3610a3058..bbd5935e11f 100644
--- a/Tests/LibWeb/Layout/expected/layout-tree-update/inline-element-position-change.txt
+++ b/Tests/LibWeb/Layout/expected/layout-tree-update/inline-element-position-change.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,79.875 784x0]
         PaintableWithLines (InlineNode<A>) [8,79.875 0x18]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x79.875] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/layout-tree-update/simple-update-inside-svg-subtree.txt b/Tests/LibWeb/Layout/expected/layout-tree-update/simple-update-inside-svg-subtree.txt
index a0da818532d..6fb3d8a1885 100644
--- a/Tests/LibWeb/Layout/expected/layout-tree-update/simple-update-inside-svg-subtree.txt
+++ b/Tests/LibWeb/Layout/expected/layout-tree-update/simple-update-inside-svg-subtree.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 300x150]
         SVGGraphicsPaintable (SVGGraphicsBox<symbol>) [8,8 300x150]
           PaintableWithLines (InlineNode<set>#set) [8,8 0x18]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/letter-spacing-end-of-line-001.txt b/Tests/LibWeb/Layout/expected/letter-spacing-end-of-line-001.txt
index 3539d5cc9ad..1481e8b80e2 100644
--- a/Tests/LibWeb/Layout/expected/letter-spacing-end-of-line-001.txt
+++ b/Tests/LibWeb/Layout/expected/letter-spacing-end-of-line-001.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,118 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x126] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/lh-1.txt b/Tests/LibWeb/Layout/expected/lh-1.txt
index 4ffe4ff354d..cbfb658f33e 100644
--- a/Tests/LibWeb/Layout/expected/lh-1.txt
+++ b/Tests/LibWeb/Layout/expected/lh-1.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableWithLines (BlockContainer<DIV>#a) [8,8 100x100]
         PaintableWithLines (BlockContainer<DIV>#b) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/lh-2.txt b/Tests/LibWeb/Layout/expected/lh-2.txt
index 4ffe4ff354d..cbfb658f33e 100644
--- a/Tests/LibWeb/Layout/expected/lh-2.txt
+++ b/Tests/LibWeb/Layout/expected/lh-2.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableWithLines (BlockContainer<DIV>#a) [8,8 100x100]
         PaintableWithLines (BlockContainer<DIV>#b) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/line-height-calc-number.txt b/Tests/LibWeb/Layout/expected/line-height-calc-number.txt
index fffa18708bf..c399566be13 100644
--- a/Tests/LibWeb/Layout/expected/line-height-calc-number.txt
+++ b/Tests/LibWeb/Layout/expected/line-height-calc-number.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x64]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x64]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x80] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/link-sheet.txt b/Tests/LibWeb/Layout/expected/link-sheet.txt
index 7aacb4c9028..be7c0bb782e 100644
--- a/Tests/LibWeb/Layout/expected/link-sheet.txt
+++ b/Tests/LibWeb/Layout/expected/link-sheet.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>#foo) [0,0 123x456]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/list-item-marker-pseudo-placement.txt b/Tests/LibWeb/Layout/expected/list-item-marker-pseudo-placement.txt
index a75de8c02d5..71a50953f0c 100644
--- a/Tests/LibWeb/Layout/expected/list-item-marker-pseudo-placement.txt
+++ b/Tests/LibWeb/Layout/expected/list-item-marker-pseudo-placement.txt
@@ -30,3 +30,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (InlineNode(anonymous)) [8,26 40.1875x18]
             TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/list-render-list-owner-is-document.txt b/Tests/LibWeb/Layout/expected/list-render-list-owner-is-document.txt
index a951d746a2f..541e4a276e2 100644
--- a/Tests/LibWeb/Layout/expected/list-render-list-owner-is-document.txt
+++ b/Tests/LibWeb/Layout/expected/list-render-list-owner-is-document.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         MarkerPaintable (ListItemMarkerBox(anonymous)) [-17.15625,26.5 13.15625x17]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/list-render-list-owner-not-ol.txt b/Tests/LibWeb/Layout/expected/list-render-list-owner-not-ol.txt
index 6453572e867..e27076adf8c 100644
--- a/Tests/LibWeb/Layout/expected/list-render-list-owner-not-ol.txt
+++ b/Tests/LibWeb/Layout/expected/list-render-list-owner-not-ol.txt
@@ -38,3 +38,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/list-render-no-list.txt b/Tests/LibWeb/Layout/expected/list-render-no-list.txt
index 034f7da9cb1..3fa648f6cc8 100644
--- a/Tests/LibWeb/Layout/expected/list-render-no-list.txt
+++ b/Tests/LibWeb/Layout/expected/list-render-no-list.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (ListItemBox<LI>) [8,26 784x18]
         MarkerPaintable (ListItemMarkerBox(anonymous)) [-16,26.5 12x17]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/media-query-empty.txt b/Tests/LibWeb/Layout/expected/media-query-empty.txt
index d996b98fe9b..fdeb10a8bad 100644
--- a/Tests/LibWeb/Layout/expected/media-query-empty.txt
+++ b/Tests/LibWeb/Layout/expected/media-query-empty.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.second) [8,26 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/media-query-resolution.txt b/Tests/LibWeb/Layout/expected/media-query-resolution.txt
index 5ea49de7781..034689d8d3f 100644
--- a/Tests/LibWeb/Layout/expected/media-query-resolution.txt
+++ b/Tests/LibWeb/Layout/expected/media-query-resolution.txt
@@ -26,3 +26,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.pass) [8,68 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,86 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x94] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/misc/corner-radius.txt b/Tests/LibWeb/Layout/expected/misc/corner-radius.txt
index 68c1f9e332e..cc51287c244 100644
--- a/Tests/LibWeb/Layout/expected/misc/corner-radius.txt
+++ b/Tests/LibWeb/Layout/expected/misc/corner-radius.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 1x18]
       PaintableWithLines (BlockContainer<DIV>) [8,8 1x18]
         ImagePaintable (ImageBox<IMG>) [8,21 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/misc/create-iframes-using-innerhtml.txt b/Tests/LibWeb/Layout/expected/misc/create-iframes-using-innerhtml.txt
index d33140824a3..968f6c1cf80 100644
--- a/Tests/LibWeb/Layout/expected/misc/create-iframes-using-innerhtml.txt
+++ b/Tests/LibWeb/Layout/expected/misc/create-iframes-using-innerhtml.txt
@@ -79,3 +79,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           NavigableContainerViewportPaintable (NavigableContainerViewport<IFRAME>) [13,223 20x20]
           NavigableContainerViewportPaintable (NavigableContainerViewport<IFRAME>) [13,253 20x20]
           NavigableContainerViewportPaintable (NavigableContainerViewport<IFRAME>) [13,283 20x20]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/misc/grid-template-block-components-whitespace-crash.txt b/Tests/LibWeb/Layout/expected/misc/grid-template-block-components-whitespace-crash.txt
index ac8ed6ccee5..a1f49136cdb 100644
--- a/Tests/LibWeb/Layout/expected/misc/grid-template-block-components-whitespace-crash.txt
+++ b/Tests/LibWeb/Layout/expected/misc/grid-template-block-components-whitespace-crash.txt
@@ -5,3 +5,6 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/misc/percentage-stroke-width-crash.txt b/Tests/LibWeb/Layout/expected/misc/percentage-stroke-width-crash.txt
index ac8ed6ccee5..a1f49136cdb 100644
--- a/Tests/LibWeb/Layout/expected/misc/percentage-stroke-width-crash.txt
+++ b/Tests/LibWeb/Layout/expected/misc/percentage-stroke-width-crash.txt
@@ -5,3 +5,6 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/misc/set-display-null.txt b/Tests/LibWeb/Layout/expected/misc/set-display-null.txt
index f4a0b262c11..f09ede02799 100644
--- a/Tests/LibWeb/Layout/expected/misc/set-display-null.txt
+++ b/Tests/LibWeb/Layout/expected/misc/set-display-null.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x116]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       PaintableWithLines (BlockContainer<DIV>#box) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/multi-code-point-graphemes.txt b/Tests/LibWeb/Layout/expected/multi-code-point-graphemes.txt
index e700c7c38a4..66d100ce5bb 100644
--- a/Tests/LibWeb/Layout/expected/multi-code-point-graphemes.txt
+++ b/Tests/LibWeb/Layout/expected/multi-code-point-graphemes.txt
@@ -32,3 +32,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<P>) [8,84 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,118 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/negative-max-size.txt b/Tests/LibWeb/Layout/expected/negative-max-size.txt
index fd64525283a..ad185f94162 100644
--- a/Tests/LibWeb/Layout/expected/negative-max-size.txt
+++ b/Tests/LibWeb/Layout/expected/negative-max-size.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x20]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x20]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/non-existing-font-family.txt b/Tests/LibWeb/Layout/expected/non-existing-font-family.txt
index 3dc7d499bc3..23f7eda9f50 100644
--- a/Tests/LibWeb/Layout/expected/non-existing-font-family.txt
+++ b/Tests/LibWeb/Layout/expected/non-existing-font-family.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/non-floating-non-replaced-element-percentage-padding-against-indefinite-width.txt b/Tests/LibWeb/Layout/expected/non-floating-non-replaced-element-percentage-padding-against-indefinite-width.txt
index 51215296480..e8bb0a4f723 100644
--- a/Tests/LibWeb/Layout/expected/non-floating-non-replaced-element-percentage-padding-against-indefinite-width.txt
+++ b/Tests/LibWeb/Layout/expected/non-floating-non-replaced-element-percentage-padding-against-indefinite-width.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<DIV>#box1) [8,8 784x0]
         PaintableWithLines (BlockContainer<DIV>) [8,8 0x0]
           PaintableBox (Box<DIV>#box2) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/nowrap-and-no-line-break-opportunity.txt b/Tests/LibWeb/Layout/expected/nowrap-and-no-line-break-opportunity.txt
index c3119d36a62..3b408d8dca9 100644
--- a/Tests/LibWeb/Layout/expected/nowrap-and-no-line-break-opportunity.txt
+++ b/Tests/LibWeb/Layout/expected/nowrap-and-no-line-break-opportunity.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (InlineNode<SPAN>.nowrap) [54.484375,9 33.921875x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/object-fallback.txt b/Tests/LibWeb/Layout/expected/object-fallback.txt
index 0273acd9bc6..edf3fee2ede 100644
--- a/Tests/LibWeb/Layout/expected/object-fallback.txt
+++ b/Tests/LibWeb/Layout/expected/object-fallback.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       PaintableWithLines (InlineNode<OBJECT>) [8,8 181.5x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/ol-render-deep-hybrid-list-item-list.txt b/Tests/LibWeb/Layout/expected/ol-render-deep-hybrid-list-item-list.txt
index 1da863da6e0..dcdf7aafe6e 100644
--- a/Tests/LibWeb/Layout/expected/ol-render-deep-hybrid-list-item-list.txt
+++ b/Tests/LibWeb/Layout/expected/ol-render-deep-hybrid-list-item-list.txt
@@ -185,3 +185,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [48,384 744x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,400 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x400] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/ol-render-item-values.txt b/Tests/LibWeb/Layout/expected/ol-render-item-values.txt
index bc4d56188e2..8f6dd41ea43 100644
--- a/Tests/LibWeb/Layout/expected/ol-render-item-values.txt
+++ b/Tests/LibWeb/Layout/expected/ol-render-item-values.txt
@@ -61,3 +61,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [-0.84375,0 800.
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [48,88 744x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,104 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x104] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/ol-render-style-list-item.txt b/Tests/LibWeb/Layout/expected/ol-render-style-list-item.txt
index 23cb36a720e..017d30a8d49 100644
--- a/Tests/LibWeb/Layout/expected/ol-render-style-list-item.txt
+++ b/Tests/LibWeb/Layout/expected/ol-render-style-list-item.txt
@@ -101,3 +101,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [48,192 744x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x208] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/ordered-list.txt b/Tests/LibWeb/Layout/expected/ordered-list.txt
index 72e1ba66b0b..8ba4f2a1a6c 100644
--- a/Tests/LibWeb/Layout/expected/ordered-list.txt
+++ b/Tests/LibWeb/Layout/expected/ordered-list.txt
@@ -98,3 +98,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [48,158 744x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,174 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x174] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/overflow-with-padding.txt b/Tests/LibWeb/Layout/expected/overflow-with-padding.txt
index 6b221a98143..76263b3e3b7 100644
--- a/Tests/LibWeb/Layout/expected/overflow-with-padding.txt
+++ b/Tests/LibWeb/Layout/expected/overflow-with-padding.txt
@@ -55,3 +55,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>.inner) [34,156 402x102] overflow: [35,157 400x234]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,252 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x260] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/overflow-x-hidden-with-border-radius.txt b/Tests/LibWeb/Layout/expected/overflow-x-hidden-with-border-radius.txt
index 1b7f0f80f02..7ee0a02f7ca 100644
--- a/Tests/LibWeb/Layout/expected/overflow-x-hidden-with-border-radius.txt
+++ b/Tests/LibWeb/Layout/expected/overflow-x-hidden-with-border-radius.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x102]
       PaintableWithLines (BlockContainer<DIV>.box) [8,8 102x102]
       PaintableWithLines (BlockContainer(anonymous)) [8,110 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/percentage-font-size.txt b/Tests/LibWeb/Layout/expected/percentage-font-size.txt
index e9ad87191ef..1e14c2da6ab 100644
--- a/Tests/LibWeb/Layout/expected/percentage-font-size.txt
+++ b/Tests/LibWeb/Layout/expected/percentage-font-size.txt
@@ -53,3 +53,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,53 784x37]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,90 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x98] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/percentage-max-height-when-containing-block-has-indefinite-height.txt b/Tests/LibWeb/Layout/expected/percentage-max-height-when-containing-block-has-indefinite-height.txt
index fb64b6fce55..fad3ef15984 100644
--- a/Tests/LibWeb/Layout/expected/percentage-max-height-when-containing-block-has-indefinite-height.txt
+++ b/Tests/LibWeb/Layout/expected/percentage-max-height-when-containing-block-has-indefinite-height.txt
@@ -66,3 +66,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<DIV>) [11,97 40.625x20]
                 TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,118 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x126] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/picture-source-media-query.txt b/Tests/LibWeb/Layout/expected/picture-source-media-query.txt
index b1bd8bfd0e9..ed5be1994c1 100644
--- a/Tests/LibWeb/Layout/expected/picture-source-media-query.txt
+++ b/Tests/LibWeb/Layout/expected/picture-source-media-query.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (InlineNode<PICTURE>) [8,8 400x400]
         PaintableWithLines (InlineNode<SOURCE>) [8,8 0x18]
         ImagePaintable (ImageBox<IMG>) [8,8 400x400]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x416] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/place-content-shorthand-property.txt b/Tests/LibWeb/Layout/expected/place-content-shorthand-property.txt
index 2f47e571904..22af3c89ed0 100644
--- a/Tests/LibWeb/Layout/expected/place-content-shorthand-property.txt
+++ b/Tests/LibWeb/Layout/expected/place-content-shorthand-property.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 812x600]
       PaintableBox (Box<DIV>.container) [10,10 802x20]
         PaintableWithLines (BlockContainer(anonymous)) [392.203125,11 37.578125x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/popovertarget-button.txt b/Tests/LibWeb/Layout/expected/popovertarget-button.txt
index 78b74bd2c2d..66596a66b08 100644
--- a/Tests/LibWeb/Layout/expected/popovertarget-button.txt
+++ b/Tests/LibWeb/Layout/expected/popovertarget-button.txt
@@ -27,3 +27,8 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<DIV>#pop) [351.84375,284 96.3125x32]
     PaintableWithLines (InlineNode<SPAN>) [358.84375,291 82.3125x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 3] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
+ SC for BlockContainer(anonymous) [0,0 800x600] [children: 0] (z-index: auto)
+ SC for BlockContainer<DIV>#pop [358.84375,291 82.3125x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/position-absolute-from-edges.txt b/Tests/LibWeb/Layout/expected/position-absolute-from-edges.txt
index 4800d32eb01..2cd43bc083b 100644
--- a/Tests/LibWeb/Layout/expected/position-absolute-from-edges.txt
+++ b/Tests/LibWeb/Layout/expected/position-absolute-from-edges.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>#green) [358,98 100x100]
         PaintableWithLines (BlockContainer<DIV>#blue) [48,308 100x100]
         PaintableWithLines (BlockContainer<DIV>#yellow) [408,308 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/position-absolute-ignores-padding-of-position-relative-floating-parent.txt b/Tests/LibWeb/Layout/expected/position-absolute-ignores-padding-of-position-relative-floating-parent.txt
index 99230f5f98d..5c328a41b61 100644
--- a/Tests/LibWeb/Layout/expected/position-absolute-ignores-padding-of-position-relative-floating-parent.txt
+++ b/Tests/LibWeb/Layout/expected/position-absolute-ignores-padding-of-position-relative-floating-parent.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#guide) [8,8 200x200]
         PaintableWithLines (BlockContainer<DIV>#container) [8,8 20x20] overflow: [8,8 100x110]
           PaintableWithLines (BlockContainer<DIV>#box) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/position-absolute-top-left.txt b/Tests/LibWeb/Layout/expected/position-absolute-top-left.txt
index a278b3a35af..142ae1f3de1 100644
--- a/Tests/LibWeb/Layout/expected/position-absolute-top-left.txt
+++ b/Tests/LibWeb/Layout/expected/position-absolute-top-left.txt
@@ -56,3 +56,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x616]
       PaintableWithLines (BlockContainer(anonymous)) [8,208 784x0]
       PaintableWithLines (BlockContainer<DIV>.blue_margin) [408,408 200x200]
       PaintableWithLines (BlockContainer(anonymous)) [8,608 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x616] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/position-empty-pseudo-elements.txt b/Tests/LibWeb/Layout/expected/position-empty-pseudo-elements.txt
index 76ce65dceb8..4eb946e6621 100644
--- a/Tests/LibWeb/Layout/expected/position-empty-pseudo-elements.txt
+++ b/Tests/LibWeb/Layout/expected/position-empty-pseudo-elements.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.content_with_space) [33,100 50x50]
         PaintableWithLines (BlockContainer(anonymous)) [33,100 50x50]
       PaintableWithLines (BlockContainer(anonymous)) [8,175 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x175] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/pre.txt b/Tests/LibWeb/Layout/expected/pre.txt
index 9457f6cd515..682315d72d4 100644
--- a/Tests/LibWeb/Layout/expected/pre.txt
+++ b/Tests/LibWeb/Layout/expected/pre.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       PaintableWithLines (InlineNode<PRE>) [8,9 18.15625x17]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/pseudo-element-with-custom-properties-2.txt b/Tests/LibWeb/Layout/expected/pseudo-element-with-custom-properties-2.txt
index 50f985258f0..7afd25dae40 100644
--- a/Tests/LibWeb/Layout/expected/pseudo-element-with-custom-properties-2.txt
+++ b/Tests/LibWeb/Layout/expected/pseudo-element-with-custom-properties-2.txt
@@ -56,3 +56,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.c) [8,369 784x100]
         PaintableWithLines (BlockContainer(anonymous)) [8,369 200x100]
       PaintableWithLines (BlockContainer(anonymous)) [8,469 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x477] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/pseudo-element-with-custom-properties.txt b/Tests/LibWeb/Layout/expected/pseudo-element-with-custom-properties.txt
index 8c0cb2df1bd..e1fbfad8439 100644
--- a/Tests/LibWeb/Layout/expected/pseudo-element-with-custom-properties.txt
+++ b/Tests/LibWeb/Layout/expected/pseudo-element-with-custom-properties.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>.hello) [8,8 784x0]
         PaintableWithLines (BlockContainer(anonymous)) [8,8 500x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/replaced-box-with-vertical-margins.txt b/Tests/LibWeb/Layout/expected/replaced-box-with-vertical-margins.txt
index a69d47bc783..5201f1498b9 100644
--- a/Tests/LibWeb/Layout/expected/replaced-box-with-vertical-margins.txt
+++ b/Tests/LibWeb/Layout/expected/replaced-box-with-vertical-margins.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       ImagePaintable (ImageBox<IMG>#image) [51.125,33 64x138]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x233] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/replaced-within-max-content.txt b/Tests/LibWeb/Layout/expected/replaced-within-max-content.txt
index c1df451178e..9b76ea345c0 100644
--- a/Tests/LibWeb/Layout/expected/replaced-within-max-content.txt
+++ b/Tests/LibWeb/Layout/expected/replaced-within-max-content.txt
@@ -18,3 +18,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x150]
       PaintableWithLines (BlockContainer<DIV>.container) [8,8 150x150]
         ImagePaintable (ImageBox<IMG>.replaced) [8,8 150x150]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/resolve-cyclic-percentage-against-zero-when-available-size-is-min-content.txt b/Tests/LibWeb/Layout/expected/resolve-cyclic-percentage-against-zero-when-available-size-is-min-content.txt
index 04b8e2bce83..24a7f19d337 100644
--- a/Tests/LibWeb/Layout/expected/resolve-cyclic-percentage-against-zero-when-available-size-is-min-content.txt
+++ b/Tests/LibWeb/Layout/expected/resolve-cyclic-percentage-against-zero-when-available-size-is-min-content.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x1254]
       PaintableWithLines (BlockContainer<DIV>.h.max) [10,840 780x404] overflow: [11,841 778x404]
         ImagePaintable (ImageBox<IMG>) [11,841 404x404]
       PaintableWithLines (BlockContainer(anonymous)) [10,1244 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x1252] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/resolve-height-of-containing-block.txt b/Tests/LibWeb/Layout/expected/resolve-height-of-containing-block.txt
index 091e620a7aa..de2d0740e45 100644
--- a/Tests/LibWeb/Layout/expected/resolve-height-of-containing-block.txt
+++ b/Tests/LibWeb/Layout/expected/resolve-height-of-containing-block.txt
@@ -39,3 +39,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 1288x824]
           PaintableWithLines (BlockContainer(anonymous)) [8,50 1280x0]
         PaintableWithLines (BlockContainer(anonymous)) [8,416 1280x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,816 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x824] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/select-with-option-selected.txt b/Tests/LibWeb/Layout/expected/select-with-option-selected.txt
index ee0eebd251b..d60e9be1b6e 100644
--- a/Tests/LibWeb/Layout/expected/select-with-option-selected.txt
+++ b/Tests/LibWeb/Layout/expected/select-with-option-selected.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableWithLines (BlockContainer<DIV>) [86.109375,11 16x16]
             SVGSVGPaintable (SVGSVGBox<svg>) [86.109375,11 16x16]
               SVGPathPaintable (SVGGeometryBox<path>) [90.109375,16.71875 8x4.953125]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/set-margin-of-floating-box.txt b/Tests/LibWeb/Layout/expected/set-margin-of-floating-box.txt
index 7b3c2cfe01f..0d820f8c909 100644
--- a/Tests/LibWeb/Layout/expected/set-margin-of-floating-box.txt
+++ b/Tests/LibWeb/Layout/expected/set-margin-of-floating-box.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<P>) [8,16 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,50 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/shadow-tree-removed-from-dom-receives-event.txt b/Tests/LibWeb/Layout/expected/shadow-tree-removed-from-dom-receives-event.txt
index a88832c2e38..1033d5a397c 100644
--- a/Tests/LibWeb/Layout/expected/shadow-tree-removed-from-dom-receives-event.txt
+++ b/Tests/LibWeb/Layout/expected/shadow-tree-removed-from-dom-receives-event.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (InlineNode<SPAN>) [8,8 43.421875x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/space-is-soft-line-break-opportunity.txt b/Tests/LibWeb/Layout/expected/space-is-soft-line-break-opportunity.txt
index 03e67535803..e6a489ccb65 100644
--- a/Tests/LibWeb/Layout/expected/space-is-soft-line-break-opportunity.txt
+++ b/Tests/LibWeb/Layout/expected/space-is-soft-line-break-opportunity.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (InlineNode<SPAN>) [9,9 0x18]
         PaintableWithLines (InlineNode<SPAN>.nowrap) [9,27 33.921875x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x54] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/span-with-padding.txt b/Tests/LibWeb/Layout/expected/span-with-padding.txt
index ac8935fe371..3a120eded7c 100644
--- a/Tests/LibWeb/Layout/expected/span-with-padding.txt
+++ b/Tests/LibWeb/Layout/expected/span-with-padding.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x21]
       PaintableWithLines (InlineNode<SPAN>) [8,-20 198.28125x127]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x37] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/srcset-sizes-crash.txt b/Tests/LibWeb/Layout/expected/srcset-sizes-crash.txt
index 9d85a60592e..06a340db4fb 100644
--- a/Tests/LibWeb/Layout/expected/srcset-sizes-crash.txt
+++ b/Tests/LibWeb/Layout/expected/srcset-sizes-crash.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
       ImagePaintable (ImageBox<IMG>) [8,20 1x1]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/style-invalidation-line-height-propagation.txt b/Tests/LibWeb/Layout/expected/style-invalidation-line-height-propagation.txt
index c9ec12915a1..40f5c51271f 100644
--- a/Tests/LibWeb/Layout/expected/style-invalidation-line-height-propagation.txt
+++ b/Tests/LibWeb/Layout/expected/style-invalidation-line-height-propagation.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,18 784x10]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg-preserve-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/svg-preserve-aspect-ratio.txt
index 05a3735b006..e9d297a619f 100644
--- a/Tests/LibWeb/Layout/expected/svg-preserve-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/svg-preserve-aspect-ratio.txt
@@ -142,3 +142,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       SVGSVGPaintable (SVGSVGBox<svg>) [248,200 162x62]
         SVGPathPaintable (SVGGeometryBox<circle>) [249,201 160x60]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x274] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg-text-with-percentage-values.txt b/Tests/LibWeb/Layout/expected/svg-text-with-percentage-values.txt
index 10262b58c9a..175507806ab 100644
--- a/Tests/LibWeb/Layout/expected/svg-text-with-percentage-values.txt
+++ b/Tests/LibWeb/Layout/expected/svg-text-with-percentage-values.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         SVGPathPaintable (SVGTextBox<text>.heavy) [146.25,35.34375 145.90625x65.453125]
         SVGPathPaintable (SVGTextBox<text>.small) [206.6875,119.796875 32.84375x32.671875]
         SVGPathPaintable (SVGTextBox<text>.Rrrrr) [249.828125,56.546875 514.125x106.03125]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x277.328125] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg-text-with-viewbox.txt b/Tests/LibWeb/Layout/expected/svg-text-with-viewbox.txt
index fd11ab9afb8..29c3afb1bc9 100644
--- a/Tests/LibWeb/Layout/expected/svg-text-with-viewbox.txt
+++ b/Tests/LibWeb/Layout/expected/svg-text-with-viewbox.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         SVGPathPaintable (SVGTextBox<text>.heavy) [143.640625,58.21875 145.90625x65.453125]
         SVGPathPaintable (SVGTextBox<text>.small) [190.359375,155.734375 32.84375x32.671875]
         SVGPathPaintable (SVGTextBox<text>.Rrrrr) [226.96875,92.46875 514.125x106.03125]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x277.328125] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg-transforms-and-viewboxes.txt b/Tests/LibWeb/Layout/expected/svg-transforms-and-viewboxes.txt
index 349460dfaa2..46a317d31db 100644
--- a/Tests/LibWeb/Layout/expected/svg-transforms-and-viewboxes.txt
+++ b/Tests/LibWeb/Layout/expected/svg-transforms-and-viewboxes.txt
@@ -127,3 +127,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x700]
         SVGPathPaintable (SVGGeometryBox<rect>) [160,460 80x80]
         SVGPathPaintable (SVGGeometryBox<rect>) [60,560 80x80]
         SVGPathPaintable (SVGGeometryBox<rect>) [160,560 80x80]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x700] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/abspos-svg-polygon.txt b/Tests/LibWeb/Layout/expected/svg/abspos-svg-polygon.txt
index 656b99c953f..7e6c0fc09a7 100644
--- a/Tests/LibWeb/Layout/expected/svg/abspos-svg-polygon.txt
+++ b/Tests/LibWeb/Layout/expected/svg/abspos-svg-polygon.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x200]
         SVGSVGPaintable (SVGSVGBox<svg>) [8,8 200x200]
           SVGPathPaintable (SVGGeometryBox<polygon>) [48,18 120x170]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/dont-stretch-fit-svg-with-indefinite-containing-block-width.txt b/Tests/LibWeb/Layout/expected/svg/dont-stretch-fit-svg-with-indefinite-containing-block-width.txt
index 5045bb10438..7b36448c8d3 100644
--- a/Tests/LibWeb/Layout/expected/svg/dont-stretch-fit-svg-with-indefinite-containing-block-width.txt
+++ b/Tests/LibWeb/Layout/expected/svg/dont-stretch-fit-svg-with-indefinite-containing-block-width.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
     PaintableWithLines (BlockContainer<BODY>) [8,8 0x18]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,21 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/inline-svg-with-zero-intrinsic-size-and-no-viewbox.txt b/Tests/LibWeb/Layout/expected/svg/inline-svg-with-zero-intrinsic-size-and-no-viewbox.txt
index a5cada8e1e2..a9b1d0d9908 100644
--- a/Tests/LibWeb/Layout/expected/svg/inline-svg-with-zero-intrinsic-size-and-no-viewbox.txt
+++ b/Tests/LibWeb/Layout/expected/svg/inline-svg-with-zero-intrinsic-size-and-no-viewbox.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       SVGSVGPaintable (SVGSVGBox<svg>) [16,21 0x0] overflow: [16,21 1x1]
         SVGPathPaintable (SVGGeometryBox<rect>) [16,21 1x1]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/natural-width-from-svg-attributes.txt b/Tests/LibWeb/Layout/expected/svg/natural-width-from-svg-attributes.txt
index db8fa622614..a6e2b8a3283 100644
--- a/Tests/LibWeb/Layout/expected/svg/natural-width-from-svg-attributes.txt
+++ b/Tests/LibWeb/Layout/expected/svg/natural-width-from-svg-attributes.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 64x64]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 64x64]
       PaintableWithLines (BlockContainer(anonymous)) [8,72 128x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x144] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/nested-viewports.txt b/Tests/LibWeb/Layout/expected/svg/nested-viewports.txt
index f841f8141c0..3bd89a60c67 100644
--- a/Tests/LibWeb/Layout/expected/svg/nested-viewports.txt
+++ b/Tests/LibWeb/Layout/expected/svg/nested-viewports.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           SVGSVGPaintable (SVGSVGBox<svg>#c) [8,8 266.671875x266.671875] overflow: [8,8 293.34375x293.34375]
             SVGPathPaintable (SVGGeometryBox<rect>) [34.671875,34.671875 266.671875x266.671875]
             SVGPathPaintable (SVGGeometryBox<rect>) [34.671875,34.671875 133.328125x133.328125]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/objectBoundingBox-mask.txt b/Tests/LibWeb/Layout/expected/svg/objectBoundingBox-mask.txt
index 8a1eaea171c..37c94506e5f 100644
--- a/Tests/LibWeb/Layout/expected/svg/objectBoundingBox-mask.txt
+++ b/Tests/LibWeb/Layout/expected/svg/objectBoundingBox-mask.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 400x400]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 200x200]
         SVGPathPaintable (SVGGeometryBox<rect>) [208,208 200x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x416] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/standalone-h.txt b/Tests/LibWeb/Layout/expected/svg/standalone-h.txt
index 4c1cbf64e89..100a3ae7409 100644
--- a/Tests/LibWeb/Layout/expected/svg/standalone-h.txt
+++ b/Tests/LibWeb/Layout/expected/svg/standalone-h.txt
@@ -16,3 +16,4 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     SVGGraphicsPaintable (SVGGraphicsBox<g>) [0,172 128x256]
       SVGPathPaintable (SVGGeometryBox<path>) [0,172 128x256]
 
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/standalone-vb-h.txt b/Tests/LibWeb/Layout/expected/svg/standalone-vb-h.txt
index fa98bcbc417..028855eede5 100644
--- a/Tests/LibWeb/Layout/expected/svg/standalone-vb-h.txt
+++ b/Tests/LibWeb/Layout/expected/svg/standalone-vb-h.txt
@@ -16,3 +16,4 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     SVGGraphicsPaintable (SVGGraphicsBox<g>) [0,0 32x64]
       SVGPathPaintable (SVGGeometryBox<path>) [0,0 32x64]
 
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/standalone-vb-w.txt b/Tests/LibWeb/Layout/expected/svg/standalone-vb-w.txt
index e5759aadaa5..475ae4efc55 100644
--- a/Tests/LibWeb/Layout/expected/svg/standalone-vb-w.txt
+++ b/Tests/LibWeb/Layout/expected/svg/standalone-vb-w.txt
@@ -16,3 +16,4 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     SVGGraphicsPaintable (SVGGraphicsBox<g>) [0,0 32x64]
       SVGPathPaintable (SVGGeometryBox<path>) [0,0 32x64]
 
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/standalone-vb-wh.txt b/Tests/LibWeb/Layout/expected/svg/standalone-vb-wh.txt
index d1f3acb8717..b8cd5773fd1 100644
--- a/Tests/LibWeb/Layout/expected/svg/standalone-vb-wh.txt
+++ b/Tests/LibWeb/Layout/expected/svg/standalone-vb-wh.txt
@@ -16,3 +16,4 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     SVGGraphicsPaintable (SVGGraphicsBox<g>) [0,0 32x64]
       SVGPathPaintable (SVGGeometryBox<path>) [0,0 32x64]
 
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/standalone-vb.txt b/Tests/LibWeb/Layout/expected/svg/standalone-vb.txt
index 13db94c3ce5..ea2e32fa798 100644
--- a/Tests/LibWeb/Layout/expected/svg/standalone-vb.txt
+++ b/Tests/LibWeb/Layout/expected/svg/standalone-vb.txt
@@ -16,3 +16,4 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     SVGGraphicsPaintable (SVGGraphicsBox<g>) [0,0 32x64]
       SVGPathPaintable (SVGGeometryBox<path>) [0,0 32x64]
 
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/standalone-w.txt b/Tests/LibWeb/Layout/expected/svg/standalone-w.txt
index d131ba6efba..9d426cb0ba9 100644
--- a/Tests/LibWeb/Layout/expected/svg/standalone-w.txt
+++ b/Tests/LibWeb/Layout/expected/svg/standalone-w.txt
@@ -16,3 +16,4 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     SVGGraphicsPaintable (SVGGraphicsBox<g>) [336,0 128x256]
       SVGPathPaintable (SVGGeometryBox<path>) [336,0 128x256]
 
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/standalone-wh.txt b/Tests/LibWeb/Layout/expected/svg/standalone-wh.txt
index 9748db92587..2e2501d55da 100644
--- a/Tests/LibWeb/Layout/expected/svg/standalone-wh.txt
+++ b/Tests/LibWeb/Layout/expected/svg/standalone-wh.txt
@@ -16,3 +16,4 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     SVGGraphicsPaintable (SVGGraphicsBox<g>) [250,0 300x600]
       SVGPathPaintable (SVGGeometryBox<path>) [250,0 300x600]
 
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/standalone.txt b/Tests/LibWeb/Layout/expected/svg/standalone.txt
index a7b14e7bf2b..83204ac770f 100644
--- a/Tests/LibWeb/Layout/expected/svg/standalone.txt
+++ b/Tests/LibWeb/Layout/expected/svg/standalone.txt
@@ -15,3 +15,5 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     SVGPathPaintable (SVGGeometryBox<rect>) [0,0 128x256]
     SVGGraphicsPaintable (SVGGraphicsBox<g>) [0,0 128x256]
       SVGPathPaintable (SVGGeometryBox<path>) [0,0 128x256]
+
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-as-image-implicit-viewbox.txt b/Tests/LibWeb/Layout/expected/svg/svg-as-image-implicit-viewbox.txt
index 11ccda20414..fbcd852ad89 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-as-image-implicit-viewbox.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-as-image-implicit-viewbox.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x116]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       ImagePaintable (ImageBox<IMG>) [8,8 50x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-as-image-invalid.txt b/Tests/LibWeb/Layout/expected/svg/svg-as-image-invalid.txt
index 55946ffd777..7ad0d2ade47 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-as-image-invalid.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-as-image-invalid.txt
@@ -7,3 +7,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       ImagePaintable (ImageBox<IMG>) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-as-image.txt b/Tests/LibWeb/Layout/expected/svg/svg-as-image.txt
index 39018f3faa0..8138c7e12e9 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-as-image.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-as-image.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x1584]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x1584]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x1568]
       ImagePaintable (ImageBox<IMG>) [8,8 784x1568]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x1584] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-circle-percentage-attr.txt b/Tests/LibWeb/Layout/expected/svg/svg-circle-percentage-attr.txt
index a360bdc3bc8..b21ef40d59c 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-circle-percentage-attr.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-circle-percentage-attr.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x350]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x350]
         SVGPathPaintable (SVGGeometryBox<circle>) [250,28 300x300]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x366] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-different-types-of-opacity.txt b/Tests/LibWeb/Layout/expected/svg/svg-different-types-of-opacity.txt
index a44594dc80d..d5758c29002 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-different-types-of-opacity.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-different-types-of-opacity.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x800]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x784]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x784]
         SVGPathPaintable (SVGGeometryBox<circle>) [47.203125,47.203125 548.796875x548.796875]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x800] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-fill-with-bogus-url.txt b/Tests/LibWeb/Layout/expected/svg/svg-fill-with-bogus-url.txt
index d3f5942296b..39de8492498 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-fill-with-bogus-url.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-fill-with-bogus-url.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x800]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x784]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x784]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 784x784]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x800] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-foreign-object-with-block-element.txt b/Tests/LibWeb/Layout/expected/svg/svg-foreign-object-with-block-element.txt
index d65a1af20d5..d45657e389b 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-foreign-object-with-block-element.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-foreign-object-with-block-element.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         SVGForeignObjectPaintable (SVGForeignObjectBox<foreignObject>) [8,8 100x100]
           PaintableWithLines (BlockContainer<DIV>) [8,8 100x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-g-inside-g.txt b/Tests/LibWeb/Layout/expected/svg/svg-g-inside-g.txt
index 2e951c974e5..36ac6b70fd1 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-g-inside-g.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-g-inside-g.txt
@@ -22,3 +22,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         SVGGraphicsPaintable (SVGGraphicsBox<g>) [58,58 10x10]
           SVGGraphicsPaintable (SVGGraphicsBox<g>) [58,58 10x10]
             SVGPathPaintable (SVGGeometryBox<rect>) [58,58 10x10]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-g-with-opacity.txt b/Tests/LibWeb/Layout/expected/svg/svg-g-with-opacity.txt
index ab444718aca..be7aeea8fa5 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-g-with-opacity.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-g-with-opacity.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x800]
         SVGGraphicsPaintable (SVGGraphicsBox<g>) [121.671875,121.671875 556.65625x556.65625]
           SVGPathPaintable (SVGGeometryBox<circle>) [121.671875,121.671875 399.84375x399.84375]
           SVGPathPaintable (SVGGeometryBox<circle>) [278.484375,278.484375 399.84375x399.84375]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x800] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-inside-inline-block.txt b/Tests/LibWeb/Layout/expected/svg/svg-inside-inline-block.txt
index 750cb1c19e1..4eac039b7ee 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-inside-inline-block.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-inside-inline-block.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>#a) [8,8 100x50]
         PaintableWithLines (BlockContainer<DIV>#b) [8,8 100x50]
           SVGSVGPaintable (SVGSVGBox<svg>) [8,8 100x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-inside-svg-with-xy.txt b/Tests/LibWeb/Layout/expected/svg/svg-inside-svg-with-xy.txt
index ba51f0a37b5..cfced7f8fa5 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-inside-svg-with-xy.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-inside-svg-with-xy.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           SVGPathPaintable (SVGGeometryBox<rect>) [27.5,17.5 101x101]
         SVGSVGPaintable (SVGSVGBox<svg>) [208,23 300x150]
           SVGPathPaintable (SVGGeometryBox<rect>) [217.5,32.5 101x101]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-inside-svg.txt b/Tests/LibWeb/Layout/expected/svg/svg-inside-svg.txt
index 1e0448583a3..43e2a645636 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-inside-svg.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-inside-svg.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         SVGGraphicsPaintable (SVGGraphicsBox<g>) [8,8 24x24]
           SVGSVGPaintable (SVGSVGBox<svg>) [8,8 24x24]
             SVGPathPaintable (SVGGeometryBox<rect>) [8,8 24x24]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-intrinsic-size-in-one-dimension.txt b/Tests/LibWeb/Layout/expected/svg/svg-intrinsic-size-in-one-dimension.txt
index c0cc06b47ee..7342de12ff9 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-intrinsic-size-in-one-dimension.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-intrinsic-size-in-one-dimension.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         SVGPathPaintable (SVGGeometryBox<rect>) [21.5,21.5 75x25]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,60 202x102]
         SVGPathPaintable (SVGGeometryBox<rect>) [34,86 150x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x170] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-line-with-percentage-values.txt b/Tests/LibWeb/Layout/expected/svg/svg-line-with-percentage-values.txt
index 6f7fad9a060..5397684ff12 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-line-with-percentage-values.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-line-with-percentage-values.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         SVGPathPaintable (SVGGeometryBox<line>) [6.046875,264.765625 787.921875x3.921875]
         SVGPathPaintable (SVGGeometryBox<line>) [264.765625,6.046875 3.921875x395.921875]
         SVGPathPaintable (SVGGeometryBox<line>) [523.484375,6.046875 3.921875x395.921875]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x408] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-negative-elliptical-arg-number.txt b/Tests/LibWeb/Layout/expected/svg/svg-negative-elliptical-arg-number.txt
index 4d6fce5deaf..416004e3e60 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-negative-elliptical-arg-number.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-negative-elliptical-arg-number.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 100x100]
         SVGPathPaintable (SVGGeometryBox<path>) [8,10 100x48]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-path-with-implicit-lineto.txt b/Tests/LibWeb/Layout/expected/svg/svg-path-with-implicit-lineto.txt
index 90898ed8d36..84575e85937 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-path-with-implicit-lineto.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-path-with-implicit-lineto.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 100x100]
         SVGPathPaintable (SVGGeometryBox<path>) [28,28 60x60]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-symbol-with-viewbox.txt b/Tests/LibWeb/Layout/expected/svg/svg-symbol-with-viewbox.txt
index 57fa9eb1f01..32f42c8171f 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-symbol-with-viewbox.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-symbol-with-viewbox.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           SVGGraphicsPaintable (SVGGraphicsBox<use>) [8,8 300x150]
             SVGGraphicsPaintable (SVGGraphicsBox<symbol>#braces) [8,8 300x150]
               SVGPathPaintable (SVGGeometryBox<path>) [92.375,26.75 131.25x112.15625]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-use-element-crashtest.txt b/Tests/LibWeb/Layout/expected/svg/svg-use-element-crashtest.txt
index 61583732175..1440e542326 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-use-element-crashtest.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-use-element-crashtest.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 300x150]
         SVGGraphicsPaintable (SVGGraphicsBox<use>) [8,8 300x150]
           SVGGraphicsPaintable (SVGGraphicsBox<symbol>#myid) [8,8 300x150]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-viewbox-zero-width.txt b/Tests/LibWeb/Layout/expected/svg/svg-viewbox-zero-width.txt
index 9a0e52e9057..101077c95e5 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-viewbox-zero-width.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-viewbox-zero-width.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x166]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x150]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 300x150]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-with-css-variable-in-presentation-hint.txt b/Tests/LibWeb/Layout/expected/svg/svg-with-css-variable-in-presentation-hint.txt
index e6cfc37775e..317cbbbed6a 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-with-css-variable-in-presentation-hint.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-with-css-variable-in-presentation-hint.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x102]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 102x102]
         SVGPathPaintable (SVGGeometryBox<rect>) [29,29 60x60]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-with-display-block.txt b/Tests/LibWeb/Layout/expected/svg/svg-with-display-block.txt
index 7fe6f82d0ca..65e7c6f7182 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-with-display-block.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-with-display-block.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x800]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x784]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x784]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 784x784]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x800] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-with-zero-intrinsic-size-and-no-viewbox.txt b/Tests/LibWeb/Layout/expected/svg/svg-with-zero-intrinsic-size-and-no-viewbox.txt
index cf850ed82fb..6925f5df961 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-with-zero-intrinsic-size-and-no-viewbox.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-with-zero-intrinsic-size-and-no-viewbox.txt
@@ -7,3 +7,5 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<svg>) [0,0 800x0]
     PaintableWithLines (InlineNode<rect>) [0,0 0x18]
+
+SC for Viewport<#document> [0,0 800x600] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/svg-with-zero-sized-viewBox.txt b/Tests/LibWeb/Layout/expected/svg/svg-with-zero-sized-viewBox.txt
index 3d951763749..638125bd0c4 100644
--- a/Tests/LibWeb/Layout/expected/svg/svg-with-zero-sized-viewBox.txt
+++ b/Tests/LibWeb/Layout/expected/svg/svg-with-zero-sized-viewBox.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x116]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/text-fill-none.txt b/Tests/LibWeb/Layout/expected/svg/text-fill-none.txt
index d40c80be15a..b7a599679b1 100644
--- a/Tests/LibWeb/Layout/expected/svg/text-fill-none.txt
+++ b/Tests/LibWeb/Layout/expected/svg/text-fill-none.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x150]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 300x150]
         SVGPathPaintable (SVGTextBox<text>) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/svg/use-honor-outer-viewBox.txt b/Tests/LibWeb/Layout/expected/svg/use-honor-outer-viewBox.txt
index 8aee3828e86..ee64dd76758 100644
--- a/Tests/LibWeb/Layout/expected/svg/use-honor-outer-viewBox.txt
+++ b/Tests/LibWeb/Layout/expected/svg/use-honor-outer-viewBox.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         SVGGraphicsPaintable (SVGGraphicsBox<use>) [9,9 100x100]
           SVGSVGPaintable (SVGSVGBox<svg>#whee) [9,9 100x100]
             SVGPathPaintable (SVGGeometryBox<rect>) [9,9 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/tab-size-chars-should-vertically-align.txt b/Tests/LibWeb/Layout/expected/tab-size-chars-should-vertically-align.txt
index 01260fc9786..0c90a989582 100644
--- a/Tests/LibWeb/Layout/expected/tab-size-chars-should-vertically-align.txt
+++ b/Tests/LibWeb/Layout/expected/tab-size-chars-should-vertically-align.txt
@@ -50,3 +50,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,53 784x15]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,68 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x76] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/tab-size-letter-spacing.txt b/Tests/LibWeb/Layout/expected/tab-size-letter-spacing.txt
index fd70bc95db6..b391645fccb 100644
--- a/Tests/LibWeb/Layout/expected/tab-size-letter-spacing.txt
+++ b/Tests/LibWeb/Layout/expected/tab-size-letter-spacing.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x15]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,23 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x31] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/tab-size-spacing-001.txt b/Tests/LibWeb/Layout/expected/tab-size-spacing-001.txt
index a881a09569c..182e3122998 100644
--- a/Tests/LibWeb/Layout/expected/tab-size-spacing-001.txt
+++ b/Tests/LibWeb/Layout/expected/tab-size-spacing-001.txt
@@ -22,3 +22,7 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<SPAN>) [156,8 20x20]
       PaintableWithLines (BlockContainer(anonymous)) [8,31 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x39] [children: 1] (z-index: auto)
+  SC for BlockContainer<DIV>.ref [186,10 16x16] [children: 0] (z-index: -1)
diff --git a/Tests/LibWeb/Layout/expected/tab-size-text-wrap.txt b/Tests/LibWeb/Layout/expected/tab-size-text-wrap.txt
index 903fab5d5fa..516cae63945 100644
--- a/Tests/LibWeb/Layout/expected/tab-size-text-wrap.txt
+++ b/Tests/LibWeb/Layout/expected/tab-size-text-wrap.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<SPAN>) [8,38 127.5625x15]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,53 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x61] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/tab-size-word-spacing.txt b/Tests/LibWeb/Layout/expected/tab-size-word-spacing.txt
index fd70bc95db6..b391645fccb 100644
--- a/Tests/LibWeb/Layout/expected/tab-size-word-spacing.txt
+++ b/Tests/LibWeb/Layout/expected/tab-size-word-spacing.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x15]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,23 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x31] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table-fixup-with-rowspan.txt b/Tests/LibWeb/Layout/expected/table-fixup-with-rowspan.txt
index c525b037ed8..ddb5886259e 100644
--- a/Tests/LibWeb/Layout/expected/table-fixup-with-rowspan.txt
+++ b/Tests/LibWeb/Layout/expected/table-fixup-with-rowspan.txt
@@ -46,3 +46,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableBox (Box<TR>) [10,54 23.90625x0]
               PaintableWithLines (BlockContainer(anonymous)) [10,54 11.09375x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,56 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x64] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/absolute-positioning-alignment.txt b/Tests/LibWeb/Layout/expected/table/absolute-positioning-alignment.txt
index 5a932641c70..4fe82c34f75 100644
--- a/Tests/LibWeb/Layout/expected/table/absolute-positioning-alignment.txt
+++ b/Tests/LibWeb/Layout/expected/table/absolute-positioning-alignment.txt
@@ -36,3 +36,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (TableWrapper(anonymous)) [196,418 156x106]
           PaintableBox (Box<DIV>.table.bottom) [196,418 156x106]
       PaintableWithLines (BlockContainer(anonymous)) [16,532 768x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [8,8 784x532] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/abspos-pseudo-element-inside-table.txt b/Tests/LibWeb/Layout/expected/table/abspos-pseudo-element-inside-table.txt
index 84115f48cd6..7404eddc324 100644
--- a/Tests/LibWeb/Layout/expected/table/abspos-pseudo-element-inside-table.txt
+++ b/Tests/LibWeb/Layout/expected/table/abspos-pseudo-element-inside-table.txt
@@ -16,3 +16,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box<THEAD>) [10,10 0x0]
             PaintableBox (Box<TR>) [10,10 0x0]
               PaintableWithLines (BlockContainer(anonymous)) [0,590 800x10]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x20] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/acid2-reduction.txt b/Tests/LibWeb/Layout/expected/table/acid2-reduction.txt
index acec1964ca6..ab4864e0f31 100644
--- a/Tests/LibWeb/Layout/expected/table/acid2-reduction.txt
+++ b/Tests/LibWeb/Layout/expected/table/acid2-reduction.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (TableWrapper(anonymous)) [8,8 50x50]
                 PaintableBox (Box<DIV>.second-part) [8,8 50x50]
             PaintableWithLines (BlockContainer<DIV>.third-part) [58,8 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/align-top-and-bottom.txt b/Tests/LibWeb/Layout/expected/table/align-top-and-bottom.txt
index 9efec45d9ec..aa16b158cbf 100644
--- a/Tests/LibWeb/Layout/expected/table/align-top-and-bottom.txt
+++ b/Tests/LibWeb/Layout/expected/table/align-top-and-bottom.txt
@@ -65,3 +65,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [161.0625,59 46.265625x50]
                 PaintableWithLines (BlockContainer(anonymous)) [177.0625,75 14.265625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/auto-height.txt b/Tests/LibWeb/Layout/expected/table/auto-height.txt
index ed6b22bf064..151ac39fec4 100644
--- a/Tests/LibWeb/Layout/expected/table/auto-height.txt
+++ b/Tests/LibWeb/Layout/expected/table/auto-height.txt
@@ -40,3 +40,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [12,34 27.640625x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [10,54 780x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/auto-margins.txt b/Tests/LibWeb/Layout/expected/table/auto-margins.txt
index b73d8260493..630254368ea 100644
--- a/Tests/LibWeb/Layout/expected/table/auto-margins.txt
+++ b/Tests/LibWeb/Layout/expected/table/auto-margins.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<DIV>.cell) [235.265625,8 329.46875x18]
                 PaintableWithLines (BlockContainer(anonymous)) [235.265625,8 329.46875x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/avoid-div-by-zero-in-table-measures.txt b/Tests/LibWeb/Layout/expected/table/avoid-div-by-zero-in-table-measures.txt
index 0f9ac3dd71a..a3d6a6aa943 100644
--- a/Tests/LibWeb/Layout/expected/table/avoid-div-by-zero-in-table-measures.txt
+++ b/Tests/LibWeb/Layout/expected/table/avoid-div-by-zero-in-table-measures.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [10,10 2x20]
                 PaintableWithLines (BlockContainer(anonymous)) [11,11 0x18] overflow: [11,11 14.265625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/basic.txt b/Tests/LibWeb/Layout/expected/table/basic.txt
index c474d052cee..1d8bf1556af 100644
--- a/Tests/LibWeb/Layout/expected/table/basic.txt
+++ b/Tests/LibWeb/Layout/expected/table/basic.txt
@@ -96,3 +96,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [11,75 93.171875x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,114 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x122] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-attribute-overridden-by-css.txt b/Tests/LibWeb/Layout/expected/table/border-attribute-overridden-by-css.txt
index da51d843749..ba968d3ad50 100644
--- a/Tests/LibWeb/Layout/expected/table/border-attribute-overridden-by-css.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-attribute-overridden-by-css.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [20,20 18.265625x22]
                 PaintableWithLines (BlockContainer(anonymous)) [22,22 14.265625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-attribute.txt b/Tests/LibWeb/Layout/expected/table/border-attribute.txt
index 0d34e39f989..88519abec17 100644
--- a/Tests/LibWeb/Layout/expected/table/border-attribute.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-attribute.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [15,15 18.265625x22]
                 PaintableWithLines (BlockContainer(anonymous)) [17,17 14.265625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-collapse-is-inherited.txt b/Tests/LibWeb/Layout/expected/table/border-collapse-is-inherited.txt
index 145ab8b10d0..2b0f2cfd9e4 100644
--- a/Tests/LibWeb/Layout/expected/table/border-collapse-is-inherited.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-collapse-is-inherited.txt
@@ -217,3 +217,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [9,9 0x0]
               PaintableWithLines (BlockContainer(anonymous)) [9,9 0x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,210 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x218] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-cell.txt b/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-cell.txt
index 67f50a2b2db..aa7f78ba6ca 100644
--- a/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-cell.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-cell.txt
@@ -89,3 +89,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>.td-thick-border) [122.125,52 58.546875x44]
                 PaintableWithLines (BlockContainer(anonymous)) [145.125,65 12.546875x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x104] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-col.txt b/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-col.txt
index c688f28fa9d..f54f26fc6ad 100644
--- a/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-col.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-col.txt
@@ -94,3 +94,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [31,141 14.265625x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,172 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x180] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-row.txt b/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-row.txt
index c7f73177199..91d1dcf25b5 100644
--- a/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-row.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-row.txt
@@ -95,3 +95,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [66.265625,96 56.546875x44]
                 PaintableWithLines (BlockContainer(anonymous)) [87.265625,109 12.546875x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x148] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-rowgroup.txt b/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-rowgroup.txt
index e405ebf0cb2..073b405f92a 100644
--- a/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-rowgroup.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-conflict-resolution-with-rowgroup.txt
@@ -97,3 +97,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [66.265625,92 55.140625x42]
                 PaintableWithLines (BlockContainer(anonymous)) [87.265625,103 11.140625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x142] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-conflict-resolutions-with-more-cells-than-cols.txt b/Tests/LibWeb/Layout/expected/table/border-conflict-resolutions-with-more-cells-than-cols.txt
index a0e98105baa..fb59086dcd7 100644
--- a/Tests/LibWeb/Layout/expected/table/border-conflict-resolutions-with-more-cells-than-cols.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-conflict-resolutions-with-more-cells-than-cols.txt
@@ -75,3 +75,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [48.921875,9 11.140625x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,28 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-spacing-and-borders-table-width.txt b/Tests/LibWeb/Layout/expected/table/border-spacing-and-borders-table-width.txt
index d9e8a24408f..68d35b9537a 100644
--- a/Tests/LibWeb/Layout/expected/table/border-spacing-and-borders-table-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-spacing-and-borders-table-width.txt
@@ -39,3 +39,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [87.265625,23 39.34375x48]
                 PaintableWithLines (BlockContainer(anonymous)) [102.265625,38 9.34375x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x94] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-spacing-colspan.txt b/Tests/LibWeb/Layout/expected/table/border-spacing-colspan.txt
index 77d2438a018..df26b6c0539 100644
--- a/Tests/LibWeb/Layout/expected/table/border-spacing-colspan.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-spacing-colspan.txt
@@ -196,3 +196,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [200.8125,230 9.09375x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,270 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x278] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-spacing-rowspan.txt b/Tests/LibWeb/Layout/expected/table/border-spacing-rowspan.txt
index 32ccc3b356c..0add8a802fb 100644
--- a/Tests/LibWeb/Layout/expected/table/border-spacing-rowspan.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-spacing-rowspan.txt
@@ -196,3 +196,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [200.8125,230 9.09375x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,270 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x278] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-spacing-with-percentage-width.txt b/Tests/LibWeb/Layout/expected/table/border-spacing-with-percentage-width.txt
index f0370a20145..632816c878f 100644
--- a/Tests/LibWeb/Layout/expected/table/border-spacing-with-percentage-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-spacing-with-percentage-width.txt
@@ -47,3 +47,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.right) [603.828125,8 188.15625x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x32] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/border-spacing.txt b/Tests/LibWeb/Layout/expected/table/border-spacing.txt
index 6769f6e2362..621b71f988f 100644
--- a/Tests/LibWeb/Layout/expected/table/border-spacing.txt
+++ b/Tests/LibWeb/Layout/expected/table/border-spacing.txt
@@ -206,3 +206,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [200.8125,230 9.09375x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,270 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x278] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/borders.txt b/Tests/LibWeb/Layout/expected/table/borders.txt
index c5fa1ea2c30..0f929191280 100644
--- a/Tests/LibWeb/Layout/expected/table/borders.txt
+++ b/Tests/LibWeb/Layout/expected/table/borders.txt
@@ -360,3 +360,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer(anonymous)) [100.015625,262 76.28125x18]
                 TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,280 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x288] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/bottom-caption.txt b/Tests/LibWeb/Layout/expected/table/bottom-caption.txt
index d7a24857791..f177c010421 100644
--- a/Tests/LibWeb/Layout/expected/table/bottom-caption.txt
+++ b/Tests/LibWeb/Layout/expected/table/bottom-caption.txt
@@ -91,3 +91,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [11,55 93.171875x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,94 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x102] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/cell-auto-max-width-table-percentage-width.txt b/Tests/LibWeb/Layout/expected/table/cell-auto-max-width-table-percentage-width.txt
index b37426eb926..c535c221771 100644
--- a/Tests/LibWeb/Layout/expected/table/cell-auto-max-width-table-percentage-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/cell-auto-max-width-table-percentage-width.txt
@@ -61,3 +61,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                   PaintableWithLines (BlockContainer(anonymous)) [48.65625,11 36.34375x18]
                     TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [8,32 80x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/cell-px-height.txt b/Tests/LibWeb/Layout/expected/table/cell-px-height.txt
index 5b2fa2ffbb4..b2a62636e41 100644
--- a/Tests/LibWeb/Layout/expected/table/cell-px-height.txt
+++ b/Tests/LibWeb/Layout/expected/table/cell-px-height.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<BODY>) [8,8 102x100]
         PaintableBox (Box<DIV>.row) [8,8 102x100]
           PaintableWithLines (BlockContainer<DIV>.cell) [8,8 102x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/cell-relative-to-specified-table-width.txt b/Tests/LibWeb/Layout/expected/table/cell-relative-to-specified-table-width.txt
index 5a9328e6803..3a8ec65079b 100644
--- a/Tests/LibWeb/Layout/expected/table/cell-relative-to-specified-table-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/cell-relative-to-specified-table-width.txt
@@ -89,3 +89,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [487.359375,32 302.640625x20]
                 PaintableWithLines (BlockContainer(anonymous)) [488.359375,33 300.640625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/cell-with-max-width.txt b/Tests/LibWeb/Layout/expected/table/cell-with-max-width.txt
index 369e13b03f8..5b05a8f266a 100644
--- a/Tests/LibWeb/Layout/expected/table/cell-with-max-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/cell-with-max-width.txt
@@ -35,3 +35,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                   PaintableWithLines (BlockContainer(anonymous)) [11,11 270x108]
                     TextPaintable (TextNode<#text>)
                   PaintableWithLines (BlockContainer<DIV>) [11,119 270x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x130] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/clip-spans-to-table-end.txt b/Tests/LibWeb/Layout/expected/table/clip-spans-to-table-end.txt
index 7c1b6c42491..a03dabb382a 100644
--- a/Tests/LibWeb/Layout/expected/table/clip-spans-to-table-end.txt
+++ b/Tests/LibWeb/Layout/expected/table/clip-spans-to-table-end.txt
@@ -93,3 +93,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [8,88 30.453125x40]
                 PaintableWithLines (BlockContainer(anonymous)) [19,99 8.453125x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/col-span-crash.txt b/Tests/LibWeb/Layout/expected/table/col-span-crash.txt
index 9ceeb0dff7a..eb337f0abb4 100644
--- a/Tests/LibWeb/Layout/expected/table/col-span-crash.txt
+++ b/Tests/LibWeb/Layout/expected/table/col-span-crash.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<TABLE>) [8,8 4x2]
       PaintableWithLines (BlockContainer(anonymous)) [8,10 784x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x36] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/colgroup-with-two-cols.txt b/Tests/LibWeb/Layout/expected/table/colgroup-with-two-cols.txt
index a610e93bfd8..0e82f3508d0 100644
--- a/Tests/LibWeb/Layout/expected/table/colgroup-with-two-cols.txt
+++ b/Tests/LibWeb/Layout/expected/table/colgroup-with-two-cols.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (TableWrapper(anonymous)) [8,8 46x2]
         PaintableBox (Box<TABLE>) [8,8 46x2]
           PaintableBox (Box<TBODY>) [10,10 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x18] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/colspan-overflow-crash.txt b/Tests/LibWeb/Layout/expected/table/colspan-overflow-crash.txt
index c6c558bcb47..886b7f6c806 100644
--- a/Tests/LibWeb/Layout/expected/table/colspan-overflow-crash.txt
+++ b/Tests/LibWeb/Layout/expected/table/colspan-overflow-crash.txt
@@ -65,3 +65,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,54 784x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x80] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/colspan-percentage-width.txt b/Tests/LibWeb/Layout/expected/table/colspan-percentage-width.txt
index a9dfe2cdf3b..ffa0afb9378 100644
--- a/Tests/LibWeb/Layout/expected/table/colspan-percentage-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/colspan-percentage-width.txt
@@ -75,3 +75,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [92.59375,31 334.40625x22]
                 PaintableWithLines (BlockContainer(anonymous)) [94.59375,33 330.40625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/colspan-weighted-width-distribution.txt b/Tests/LibWeb/Layout/expected/table/colspan-weighted-width-distribution.txt
index dd83ee7d166..7b40435667e 100644
--- a/Tests/LibWeb/Layout/expected/table/colspan-weighted-width-distribution.txt
+++ b/Tests/LibWeb/Layout/expected/table/colspan-weighted-width-distribution.txt
@@ -55,3 +55,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [9,31 208x22]
                 PaintableWithLines (BlockContainer(anonymous)) [11,33 204x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/colspan-width-distribution.txt b/Tests/LibWeb/Layout/expected/table/colspan-width-distribution.txt
index 33864ff52ee..6790e08eef5 100644
--- a/Tests/LibWeb/Layout/expected/table/colspan-width-distribution.txt
+++ b/Tests/LibWeb/Layout/expected/table/colspan-width-distribution.txt
@@ -64,3 +64,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [11,33 33.3125x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,54 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/colspan-with-trailing-characters.txt b/Tests/LibWeb/Layout/expected/table/colspan-with-trailing-characters.txt
index a954944019b..8da2ac258ab 100644
--- a/Tests/LibWeb/Layout/expected/table/colspan-with-trailing-characters.txt
+++ b/Tests/LibWeb/Layout/expected/table/colspan-with-trailing-characters.txt
@@ -126,3 +126,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [161.5625,77 72.796875x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,98 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x106] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/columns-width-distribution-1.txt b/Tests/LibWeb/Layout/expected/table/columns-width-distribution-1.txt
index 05f339d8f0b..270c11bce09 100644
--- a/Tests/LibWeb/Layout/expected/table/columns-width-distribution-1.txt
+++ b/Tests/LibWeb/Layout/expected/table/columns-width-distribution-1.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>.mbox-text) [65,11 724x110]
                 PaintableWithLines (BlockContainer(anonymous)) [66,12 722x108]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x132] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/display-table-size.txt b/Tests/LibWeb/Layout/expected/table/display-table-size.txt
index 0986c044b64..754fe45cf94 100644
--- a/Tests/LibWeb/Layout/expected/table/display-table-size.txt
+++ b/Tests/LibWeb/Layout/expected/table/display-table-size.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x50]
       PaintableWithLines (TableWrapper(anonymous)) [8,8 50x50]
         PaintableBox (Box<DIV>) [8,8 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/fixed-layout-percentage-width-all-columns.txt b/Tests/LibWeb/Layout/expected/table/fixed-layout-percentage-width-all-columns.txt
index 16d60c26959..f0232e8e67e 100644
--- a/Tests/LibWeb/Layout/expected/table/fixed-layout-percentage-width-all-columns.txt
+++ b/Tests/LibWeb/Layout/expected/table/fixed-layout-percentage-width-all-columns.txt
@@ -105,3 +105,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [274.765625,31 332.234375x22]
                 PaintableWithLines (BlockContainer(anonymous)) [276.765625,33 328.234375x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/fixed-layout-percentage-width.txt b/Tests/LibWeb/Layout/expected/table/fixed-layout-percentage-width.txt
index d959a66436f..387edad1d4c 100644
--- a/Tests/LibWeb/Layout/expected/table/fixed-layout-percentage-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/fixed-layout-percentage-width.txt
@@ -105,3 +105,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [307.96875,31 299x22]
                 PaintableWithLines (BlockContainer(anonymous)) [309.96875,33 295x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/fixed-layout-pixel-width-all-columns.txt b/Tests/LibWeb/Layout/expected/table/fixed-layout-pixel-width-all-columns.txt
index 75a823bdf8a..b5df85d71b1 100644
--- a/Tests/LibWeb/Layout/expected/table/fixed-layout-pixel-width-all-columns.txt
+++ b/Tests/LibWeb/Layout/expected/table/fixed-layout-pixel-width-all-columns.txt
@@ -105,3 +105,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [254.6875,31 352.3125x22]
                 PaintableWithLines (BlockContainer(anonymous)) [256.6875,33 348.3125x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/fixed-layout-pixel-width.txt b/Tests/LibWeb/Layout/expected/table/fixed-layout-pixel-width.txt
index d51ab0e1c77..ea38df469ca 100644
--- a/Tests/LibWeb/Layout/expected/table/fixed-layout-pixel-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/fixed-layout-pixel-width.txt
@@ -109,3 +109,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [303,49 304x40]
                 PaintableWithLines (BlockContainer(anonymous)) [305,60 300x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x98] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/fixed-layout.txt b/Tests/LibWeb/Layout/expected/table/fixed-layout.txt
index 2111ef332fc..72a7937c673 100644
--- a/Tests/LibWeb/Layout/expected/table/fixed-layout.txt
+++ b/Tests/LibWeb/Layout/expected/table/fixed-layout.txt
@@ -105,3 +105,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [457.5,31 149.5x22]
                 PaintableWithLines (BlockContainer(anonymous)) [459.5,33 145.5x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x62] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/fixed-margins.txt b/Tests/LibWeb/Layout/expected/table/fixed-margins.txt
index 6fe14d3f1a0..fa119f62e4c 100644
--- a/Tests/LibWeb/Layout/expected/table/fixed-margins.txt
+++ b/Tests/LibWeb/Layout/expected/table/fixed-margins.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<DIV>.cell) [108,8 584x36]
                 PaintableWithLines (BlockContainer(anonymous)) [108,8 584x36]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/in-auto-height-flex-item.txt b/Tests/LibWeb/Layout/expected/table/in-auto-height-flex-item.txt
index 8ff0d61b93d..db88d494e37 100644
--- a/Tests/LibWeb/Layout/expected/table/in-auto-height-flex-item.txt
+++ b/Tests/LibWeb/Layout/expected/table/in-auto-height-flex-item.txt
@@ -21,3 +21,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<DIV>.cell) [11,11 41.78125x20]
                 PaintableWithLines (BlockContainer(anonymous)) [12,12 39.78125x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/infinite-padding.txt b/Tests/LibWeb/Layout/expected/table/infinite-padding.txt
index 0c6c2325260..d429276dbf4 100644
--- a/Tests/LibWeb/Layout/expected/table/infinite-padding.txt
+++ b/Tests/LibWeb/Layout/expected/table/infinite-padding.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<DIV>) [8,8 0x0]
                 PaintableWithLines (TableWrapper(anonymous)) [8,8 0x0]
                   PaintableBox (Box<DIV>#box2) [8,8 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/inline-table-width.txt b/Tests/LibWeb/Layout/expected/table/inline-table-width.txt
index 53b92e676de..40c4d1a0edf 100644
--- a/Tests/LibWeb/Layout/expected/table/inline-table-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/inline-table-width.txt
@@ -50,3 +50,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer<TD>) [102.90625,33 40.078125x20]
                   PaintableWithLines (BlockContainer(anonymous)) [103.90625,34 38.078125x18]
                     TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x64] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/internal-alignment.txt b/Tests/LibWeb/Layout/expected/table/internal-alignment.txt
index 1a9179dd432..21b943f43b4 100644
--- a/Tests/LibWeb/Layout/expected/table/internal-alignment.txt
+++ b/Tests/LibWeb/Layout/expected/table/internal-alignment.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer<TD>) [303,11 194x198]
                   PaintableWithLines (BlockContainer<P>) [304,101 192x18]
                     TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/keyword-value-does-not-constrain-column.txt b/Tests/LibWeb/Layout/expected/table/keyword-value-does-not-constrain-column.txt
index 161362a6958..c3e369878ef 100644
--- a/Tests/LibWeb/Layout/expected/table/keyword-value-does-not-constrain-column.txt
+++ b/Tests/LibWeb/Layout/expected/table/keyword-value-does-not-constrain-column.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [11,11 31.609375x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,32 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/line-breaking-in-cells.txt b/Tests/LibWeb/Layout/expected/table/line-breaking-in-cells.txt
index a3ed0384839..395dd2a9f80 100644
--- a/Tests/LibWeb/Layout/expected/table/line-breaking-in-cells.txt
+++ b/Tests/LibWeb/Layout/expected/table/line-breaking-in-cells.txt
@@ -58,3 +58,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [50.703125,8 18.296875x40]
                 PaintableWithLines (BlockContainer(anonymous)) [52.703125,19 14.296875x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x56] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/long-caption-increases-width.txt b/Tests/LibWeb/Layout/expected/table/long-caption-increases-width.txt
index 84c0935d0d3..a08e20c25a9 100644
--- a/Tests/LibWeb/Layout/expected/table/long-caption-increases-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/long-caption-increases-width.txt
@@ -123,3 +123,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [41.25,96 23.796875x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,156 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x164] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/missing-cells-with-span.txt b/Tests/LibWeb/Layout/expected/table/missing-cells-with-span.txt
index 877969e5481..b3c6bd3bbf4 100644
--- a/Tests/LibWeb/Layout/expected/table/missing-cells-with-span.txt
+++ b/Tests/LibWeb/Layout/expected/table/missing-cells-with-span.txt
@@ -59,3 +59,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                     TextPaintable (TextNode<#text>)
                 PaintableWithLines (BlockContainer(anonymous)) [61.5625,89 22.71875x40]
                 PaintableWithLines (BlockContainer(anonymous)) [84.28125,89 22.71875x40]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x138] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/missing-cells.txt b/Tests/LibWeb/Layout/expected/table/missing-cells.txt
index 61029ee72f4..4963ed0f824 100644
--- a/Tests/LibWeb/Layout/expected/table/missing-cells.txt
+++ b/Tests/LibWeb/Layout/expected/table/missing-cells.txt
@@ -55,3 +55,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                   PaintableWithLines (BlockContainer(anonymous)) [20,100 30.5625x18]
                     TextPaintable (TextNode<#text>)
                 PaintableWithLines (BlockContainer(anonymous)) [61.5625,89 45.4375x40]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x138] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/multi-line-cell.txt b/Tests/LibWeb/Layout/expected/table/multi-line-cell.txt
index f736f20a7ba..4fb0a313408 100644
--- a/Tests/LibWeb/Layout/expected/table/multi-line-cell.txt
+++ b/Tests/LibWeb/Layout/expected/table/multi-line-cell.txt
@@ -42,3 +42,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [13,37 71.4375x36]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,78 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x86] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/nested-table-alignment.txt b/Tests/LibWeb/Layout/expected/table/nested-table-alignment.txt
index 1d7577379ac..57afe6a9d84 100644
--- a/Tests/LibWeb/Layout/expected/table/nested-table-alignment.txt
+++ b/Tests/LibWeb/Layout/expected/table/nested-table-alignment.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                         PaintableWithLines (BlockContainer<TD>) [161.890625,15 39.109375x198]
                           PaintableWithLines (BlockContainer(anonymous)) [162.890625,105 37.109375x18]
                             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x228] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/nested-table-box-width.txt b/Tests/LibWeb/Layout/expected/table/nested-table-box-width.txt
index 8823a7b78eb..a59bb329334 100644
--- a/Tests/LibWeb/Layout/expected/table/nested-table-box-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/nested-table-box-width.txt
@@ -112,3 +112,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [25,90.5 11.5625x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,134 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x142] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/percentage-width-columns.txt b/Tests/LibWeb/Layout/expected/table/percentage-width-columns.txt
index 24209411174..b4051873b85 100644
--- a/Tests/LibWeb/Layout/expected/table/percentage-width-columns.txt
+++ b/Tests/LibWeb/Layout/expected/table/percentage-width-columns.txt
@@ -53,3 +53,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [82.59375,9 18.40625x22]
                 PaintableWithLines (BlockContainer(anonymous)) [84.59375,11 14.40625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x40] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/percentage-width-for-nested-table-is-like-auto.txt b/Tests/LibWeb/Layout/expected/table/percentage-width-for-nested-table-is-like-auto.txt
index abda71f4e16..8349a917a5b 100644
--- a/Tests/LibWeb/Layout/expected/table/percentage-width-for-nested-table-is-like-auto.txt
+++ b/Tests/LibWeb/Layout/expected/table/percentage-width-for-nested-table-is-like-auto.txt
@@ -35,3 +35,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                             PaintableWithLines (BlockContainer<TD>) [14,14 188x20]
                               PaintableWithLines (BlockContainer(anonymous)) [15,15 186x18]
                                 TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x48] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/percentage-width-max-width-columns.txt b/Tests/LibWeb/Layout/expected/table/percentage-width-max-width-columns.txt
index 64efc177501..6eba42502ad 100644
--- a/Tests/LibWeb/Layout/expected/table/percentage-width-max-width-columns.txt
+++ b/Tests/LibWeb/Layout/expected/table/percentage-width-max-width-columns.txt
@@ -49,3 +49,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [91.296875,8 35.703125x22]
                 PaintableWithLines (BlockContainer(anonymous)) [93.296875,10 31.703125x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/propagate-style-update-to-wrapper.txt b/Tests/LibWeb/Layout/expected/table/propagate-style-update-to-wrapper.txt
index ae4a0916cee..a442a665a33 100644
--- a/Tests/LibWeb/Layout/expected/table/propagate-style-update-to-wrapper.txt
+++ b/Tests/LibWeb/Layout/expected/table/propagate-style-update-to-wrapper.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box<TBODY>) [10,10 2x2]
             PaintableBox (Box<TR>) [10,10 2x2]
               PaintableWithLines (BlockContainer<TD>) [10,10 2x2]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/row-outer-size-with-computed-size.txt b/Tests/LibWeb/Layout/expected/table/row-outer-size-with-computed-size.txt
index 9026827aca1..2446f8c3063 100644
--- a/Tests/LibWeb/Layout/expected/table/row-outer-size-with-computed-size.txt
+++ b/Tests/LibWeb/Layout/expected/table/row-outer-size-with-computed-size.txt
@@ -47,3 +47,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                     TextPaintable (TextNode<#text>)
             PaintableBox (Box<TR>) [10,22 45.21875x10]
               PaintableWithLines (BlockContainer<TD>) [10,22 2x10]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x42] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/row-px-height.txt b/Tests/LibWeb/Layout/expected/table/row-px-height.txt
index 5b2fa2ffbb4..b2a62636e41 100644
--- a/Tests/LibWeb/Layout/expected/table/row-px-height.txt
+++ b/Tests/LibWeb/Layout/expected/table/row-px-height.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableBox (Box<BODY>) [8,8 102x100]
         PaintableBox (Box<DIV>.row) [8,8 102x100]
           PaintableWithLines (BlockContainer<DIV>.cell) [8,8 102x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/row-span-and-nested-tables.txt b/Tests/LibWeb/Layout/expected/table/row-span-and-nested-tables.txt
index 92f36a269d4..de3c5fd2f0c 100644
--- a/Tests/LibWeb/Layout/expected/table/row-span-and-nested-tables.txt
+++ b/Tests/LibWeb/Layout/expected/table/row-span-and-nested-tables.txt
@@ -128,3 +128,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [17,86.5 11.5625x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,126 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x134] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/rows-height-distribution-1.txt b/Tests/LibWeb/Layout/expected/table/rows-height-distribution-1.txt
index cebc40abeba..5a517d0781c 100644
--- a/Tests/LibWeb/Layout/expected/table/rows-height-distribution-1.txt
+++ b/Tests/LibWeb/Layout/expected/table/rows-height-distribution-1.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<DIV>.cell) [8,8 200x50]
           PaintableBox (Box<DIV>.row.b) [8,58 200x100]
             PaintableWithLines (BlockContainer<DIV>.cell) [8,58 200x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/rows-height-distribution-2.txt b/Tests/LibWeb/Layout/expected/table/rows-height-distribution-2.txt
index 75e27faa9c0..c537e355041 100644
--- a/Tests/LibWeb/Layout/expected/table/rows-height-distribution-2.txt
+++ b/Tests/LibWeb/Layout/expected/table/rows-height-distribution-2.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<DIV>.cell) [8,8 200x150]
           PaintableBox (Box<DIV>.row.b) [8,158 200x150]
             PaintableWithLines (BlockContainer<DIV>.cell) [8,158 200x150]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x316] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/rows-height-distribution-3.txt b/Tests/LibWeb/Layout/expected/table/rows-height-distribution-3.txt
index f0c32b7b308..cc3b5b8f8fd 100644
--- a/Tests/LibWeb/Layout/expected/table/rows-height-distribution-3.txt
+++ b/Tests/LibWeb/Layout/expected/table/rows-height-distribution-3.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<DIV>.cell) [8,158 200x150]
               PaintableWithLines (BlockContainer(anonymous)) [8,158 200x18]
                 TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x316] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/rows-height-distribution-4.txt b/Tests/LibWeb/Layout/expected/table/rows-height-distribution-4.txt
index ad69e6802cc..0360dfe5ec6 100644
--- a/Tests/LibWeb/Layout/expected/table/rows-height-distribution-4.txt
+++ b/Tests/LibWeb/Layout/expected/table/rows-height-distribution-4.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<DIV>.cell) [8,108 200x200]
               PaintableWithLines (BlockContainer(anonymous)) [8,108 200x18]
                 TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x316] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/rowspan-with-trailing-characters.txt b/Tests/LibWeb/Layout/expected/table/rowspan-with-trailing-characters.txt
index d9736f0d4ca..e5cb957d289 100644
--- a/Tests/LibWeb/Layout/expected/table/rowspan-with-trailing-characters.txt
+++ b/Tests/LibWeb/Layout/expected/table/rowspan-with-trailing-characters.txt
@@ -218,3 +218,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [85.046875,121 72.515625x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,142 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x150] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/rowspan.txt b/Tests/LibWeb/Layout/expected/table/rowspan.txt
index e98925fe8bd..2b43463b8cc 100644
--- a/Tests/LibWeb/Layout/expected/table/rowspan.txt
+++ b/Tests/LibWeb/Layout/expected/table/rowspan.txt
@@ -156,3 +156,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [161.5625,77 72.796875x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,98 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x106] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/size.txt b/Tests/LibWeb/Layout/expected/table/size.txt
index b86daf930d9..139d7067f1e 100644
--- a/Tests/LibWeb/Layout/expected/table/size.txt
+++ b/Tests/LibWeb/Layout/expected/table/size.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 2350x600]
               PaintableWithLines (BlockContainer<DIV>) [350,8 2000x18]
                 TextPaintable (TextNode<#text>)
               PaintableWithLines (BlockContainer(anonymous)) [350,26 100x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/stretch-to-fixed-height.txt b/Tests/LibWeb/Layout/expected/table/stretch-to-fixed-height.txt
index 542ff31fe6b..654b5014ae7 100644
--- a/Tests/LibWeb/Layout/expected/table/stretch-to-fixed-height.txt
+++ b/Tests/LibWeb/Layout/expected/table/stretch-to-fixed-height.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<TABLE>) [8,8 24x100]
           PaintableBox (Box<TBODY>) [21,21 0x0]
             PaintableBox (Box<TR>) [21,21 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/style-invalidation-propagation-to-table-wrapper.txt b/Tests/LibWeb/Layout/expected/table/style-invalidation-propagation-to-table-wrapper.txt
index f7af1b80e80..c8d5fec438f 100644
--- a/Tests/LibWeb/Layout/expected/table/style-invalidation-propagation-to-table-wrapper.txt
+++ b/Tests/LibWeb/Layout/expected/table/style-invalidation-propagation-to-table-wrapper.txt
@@ -20,3 +20,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableBox (Box<TR>) [202,10 388x100]
                 PaintableWithLines (BlockContainer<TD>) [202,10 388x100]
                   PaintableWithLines (BlockContainer(anonymous)) [203,60 386x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/sum-of-percentage-column-widths-less-than-100.txt b/Tests/LibWeb/Layout/expected/table/sum-of-percentage-column-widths-less-than-100.txt
index c16f5353145..36e4371e4d9 100644
--- a/Tests/LibWeb/Layout/expected/table/sum-of-percentage-column-widths-less-than-100.txt
+++ b/Tests/LibWeb/Layout/expected/table/sum-of-percentage-column-widths-less-than-100.txt
@@ -49,3 +49,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [83.984375,11 23x22]
                 PaintableWithLines (BlockContainer(anonymous)) [85.984375,13 19x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x44] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-align-center-with-margin.txt b/Tests/LibWeb/Layout/expected/table/table-align-center-with-margin.txt
index fb5d7fe0c7b..9c54b32e7ee 100644
--- a/Tests/LibWeb/Layout/expected/table/table-align-center-with-margin.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-align-center-with-margin.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [111,103 83.34375x198]
                 PaintableWithLines (BlockContainer(anonymous)) [112,193 81.34375x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x404] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-align-center.txt b/Tests/LibWeb/Layout/expected/table/table-align-center.txt
index a7e4d591a41..fe4fe457432 100644
--- a/Tests/LibWeb/Layout/expected/table/table-align-center.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-align-center.txt
@@ -23,3 +23,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [373.1875,11 53.625x198]
                 PaintableWithLines (BlockContainer(anonymous)) [374.1875,101 51.625x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-cell-not-paintable.txt b/Tests/LibWeb/Layout/expected/table/table-cell-not-paintable.txt
index 6a9090582d8..7a4b9ebca64 100644
--- a/Tests/LibWeb/Layout/expected/table/table-cell-not-paintable.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-cell-not-paintable.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<BUTTON>) [8,17 10x4]
         PaintableWithLines (BlockContainer(anonymous)) [13,19 0x0]
           PaintableWithLines (BlockContainer(anonymous)) [13,19 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-cellpadding.txt b/Tests/LibWeb/Layout/expected/table/table-cellpadding.txt
index 5e14dfb96ed..c7f3d8f9f4f 100644
--- a/Tests/LibWeb/Layout/expected/table/table-cellpadding.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-cellpadding.txt
@@ -39,3 +39,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [327.078125,11 176.109375x198]
                 PaintableWithLines (BlockContainer(anonymous)) [387.078125,131 56.109375x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-fixup-font-size-and-line-height.txt b/Tests/LibWeb/Layout/expected/table/table-fixup-font-size-and-line-height.txt
index d06abccd5f4..956ac2802aa 100644
--- a/Tests/LibWeb/Layout/expected/table/table-fixup-font-size-and-line-height.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-fixup-font-size-and-line-height.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box(anonymous)) [8,8 69.078125x100]
             PaintableWithLines (BlockContainer(anonymous)) [8,8 69.078125x100]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x116] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-formation-with-rowspan-in-the-middle.txt b/Tests/LibWeb/Layout/expected/table/table-formation-with-rowspan-in-the-middle.txt
index c5e3c1fe7d5..70e883a8b73 100644
--- a/Tests/LibWeb/Layout/expected/table/table-formation-with-rowspan-in-the-middle.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-formation-with-rowspan-in-the-middle.txt
@@ -120,3 +120,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [87.859375,140 11.5625x18]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,170 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x178] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-header-and-footer-groups.txt b/Tests/LibWeb/Layout/expected/table/table-header-and-footer-groups.txt
index ed18db5b62b..1cd9d4c5c59 100644
--- a/Tests/LibWeb/Layout/expected/table/table-header-and-footer-groups.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-header-and-footer-groups.txt
@@ -27,3 +27,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box(anonymous)) [10,110 300x100]
             PaintableWithLines (BlockContainer(anonymous)) [10,110 300x100]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x218] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-max-content-width.txt b/Tests/LibWeb/Layout/expected/table/table-max-content-width.txt
index 72f7b316146..2395d359d49 100644
--- a/Tests/LibWeb/Layout/expected/table/table-max-content-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-max-content-width.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box<TBODY>) [20,20 102x100]
             PaintableBox (Box<TR>) [20,20 102x100]
               PaintableWithLines (BlockContainer<TD>) [20,20 102x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x140] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-width-max-content-containing-block.txt b/Tests/LibWeb/Layout/expected/table/table-width-max-content-containing-block.txt
index b5e040a0eab..246f78afba6 100644
--- a/Tests/LibWeb/Layout/expected/table/table-width-max-content-containing-block.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-width-max-content-containing-block.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box(anonymous)) [8,8 425.828125x18]
             PaintableWithLines (BlockContainer(anonymous)) [8,8 425.828125x18]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-width-max-content.txt b/Tests/LibWeb/Layout/expected/table/table-width-max-content.txt
index b5e040a0eab..246f78afba6 100644
--- a/Tests/LibWeb/Layout/expected/table/table-width-max-content.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-width-max-content.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box(anonymous)) [8,8 425.828125x18]
             PaintableWithLines (BlockContainer(anonymous)) [8,8 425.828125x18]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-width-min-content-containing-block.txt b/Tests/LibWeb/Layout/expected/table/table-width-min-content-containing-block.txt
index 03b05b7fca4..b304e5f92b7 100644
--- a/Tests/LibWeb/Layout/expected/table/table-width-min-content-containing-block.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-width-min-content-containing-block.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box(anonymous)) [8,8 55.359375x162]
             PaintableWithLines (BlockContainer(anonymous)) [8,8 55.359375x162]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x178] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-width-min-content.txt b/Tests/LibWeb/Layout/expected/table/table-width-min-content.txt
index 03b05b7fca4..b304e5f92b7 100644
--- a/Tests/LibWeb/Layout/expected/table/table-width-min-content.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-width-min-content.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box(anonymous)) [8,8 55.359375x162]
             PaintableWithLines (BlockContainer(anonymous)) [8,8 55.359375x162]
               TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x178] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/table-width.txt b/Tests/LibWeb/Layout/expected/table/table-width.txt
index 2e5cd2ed4d4..5be87bbbc93 100644
--- a/Tests/LibWeb/Layout/expected/table/table-width.txt
+++ b/Tests/LibWeb/Layout/expected/table/table-width.txt
@@ -15,3 +15,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           PaintableBox (Box<TBODY>) [110,110 580x10]
             PaintableBox (Box<TR>) [110,110 580x10]
               PaintableWithLines (BlockContainer<TD>.cell) [110,110 580x10]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x230] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/td-valign.txt b/Tests/LibWeb/Layout/expected/table/td-valign.txt
index 4041a3451ea..cc32dfe4fd8 100644
--- a/Tests/LibWeb/Layout/expected/table/td-valign.txt
+++ b/Tests/LibWeb/Layout/expected/table/td-valign.txt
@@ -39,3 +39,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [91.078125,11 58.109375x198]
                 PaintableWithLines (BlockContainer(anonymous)) [92.078125,190 56.109375x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/top-caption-with-padding.txt b/Tests/LibWeb/Layout/expected/table/top-caption-with-padding.txt
index de3dadd88af..c06f06ef6ef 100644
--- a/Tests/LibWeb/Layout/expected/table/top-caption-with-padding.txt
+++ b/Tests/LibWeb/Layout/expected/table/top-caption-with-padding.txt
@@ -37,3 +37,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,-2 800x602]
               PaintableWithLines (BlockContainer<TD>) [10,38 56.46875x20]
                 PaintableWithLines (BlockContainer(anonymous)) [11,39 54.46875x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x106] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/tr-valign.txt b/Tests/LibWeb/Layout/expected/table/tr-valign.txt
index b9803872d22..cd30e7d3476 100644
--- a/Tests/LibWeb/Layout/expected/table/tr-valign.txt
+++ b/Tests/LibWeb/Layout/expected/table/tr-valign.txt
@@ -22,3 +22,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer<DIV>) [12,12 102x502]
               PaintableWithLines (BlockContainer<TD>) [117,11 104x504]
                 PaintableWithLines (BlockContainer<DIV>) [118,12 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x526] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/vertical-align-baseline.txt b/Tests/LibWeb/Layout/expected/table/vertical-align-baseline.txt
index 83d0549ba6b..4f71cf020d5 100644
--- a/Tests/LibWeb/Layout/expected/table/vertical-align-baseline.txt
+++ b/Tests/LibWeb/Layout/expected/table/vertical-align-baseline.txt
@@ -56,3 +56,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                 PaintableWithLines (BlockContainer(anonymous)) [364.90625,61 255.75x46]
                   TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,110 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/vertical-align-middle-td-vs-div.txt b/Tests/LibWeb/Layout/expected/table/vertical-align-middle-td-vs-div.txt
index ac1a197083f..24bc6376d9c 100644
--- a/Tests/LibWeb/Layout/expected/table/vertical-align-middle-td-vs-div.txt
+++ b/Tests/LibWeb/Layout/expected/table/vertical-align-middle-td-vs-div.txt
@@ -33,3 +33,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,112 784x100]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,212 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x220] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/vertical-align-middle-vs-top.txt b/Tests/LibWeb/Layout/expected/table/vertical-align-middle-vs-top.txt
index 04a5a66dbe0..6f71c022649 100644
--- a/Tests/LibWeb/Layout/expected/table/vertical-align-middle-vs-top.txt
+++ b/Tests/LibWeb/Layout/expected/table/vertical-align-middle-vs-top.txt
@@ -29,3 +29,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                     TextPaintable (TextNode<#text>)
                     PaintableWithLines (InlineNode<SPAN>) [179.734375,10 172.765625x115]
                       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x135] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns-increased-size-on-col.txt b/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns-increased-size-on-col.txt
index a9815effb85..2f1510ee421 100644
--- a/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns-increased-size-on-col.txt
+++ b/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns-increased-size-on-col.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [63,11 362x22]
                 PaintableWithLines (BlockContainer(anonymous)) [65,13 358x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x44] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns-size-on-col.txt b/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns-size-on-col.txt
index e119199b977..0adbaf40dda 100644
--- a/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns-size-on-col.txt
+++ b/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns-size-on-col.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [31.265625,11 393.734375x22]
                 PaintableWithLines (BlockContainer(anonymous)) [33.265625,13 389.734375x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x44] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns.txt b/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns.txt
index 4dcf45599bd..7d634e50afb 100644
--- a/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns.txt
+++ b/Tests/LibWeb/Layout/expected/table/width-distribution-and-constrained-columns.txt
@@ -39,3 +39,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [31.265625,11 393.734375x22]
                 PaintableWithLines (BlockContainer(anonymous)) [33.265625,13 389.734375x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x44] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/width-distribution-of-max-width-increment.txt b/Tests/LibWeb/Layout/expected/table/width-distribution-of-max-width-increment.txt
index aec85e06594..b5acdc00a9b 100644
--- a/Tests/LibWeb/Layout/expected/table/width-distribution-of-max-width-increment.txt
+++ b/Tests/LibWeb/Layout/expected/table/width-distribution-of-max-width-increment.txt
@@ -53,3 +53,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
               PaintableWithLines (BlockContainer<TD>) [388.890625,8 403.109375x22]
                 PaintableWithLines (BlockContainer(anonymous)) [390.890625,10 399.109375x18]
                   TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/table/zero-columns-gridmax.txt b/Tests/LibWeb/Layout/expected/table/zero-columns-gridmax.txt
index 349bcb2af3e..8cec371320d 100644
--- a/Tests/LibWeb/Layout/expected/table/zero-columns-gridmax.txt
+++ b/Tests/LibWeb/Layout/expected/table/zero-columns-gridmax.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>.table) [8,8 200x0]
           PaintableBox (Box<DIV>.row) [8,8 200x0]
             PaintableWithLines (BlockContainer<DIV>.cell) [8,8 200x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/text-align-justify-with-forced-break.txt b/Tests/LibWeb/Layout/expected/text-align-justify-with-forced-break.txt
index eadd529eedd..2e79270d986 100644
--- a/Tests/LibWeb/Layout/expected/text-align-justify-with-forced-break.txt
+++ b/Tests/LibWeb/Layout/expected/text-align-justify-with-forced-break.txt
@@ -75,3 +75,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         TextPaintable (TextNode<#text>)
         TextPaintable (TextNode<#text>)
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/text-align-overflow.txt b/Tests/LibWeb/Layout/expected/text-align-overflow.txt
index df692daabb6..ae579e71c8a 100644
--- a/Tests/LibWeb/Layout/expected/text-align-overflow.txt
+++ b/Tests/LibWeb/Layout/expected/text-align-overflow.txt
@@ -13,3 +13,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.outer) [18,8 80x18]
         PaintableWithLines (BlockContainer<SPAN>.text) [18,8 80x18] overflow: [18,8 189.875x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/text-collapse-inside-contenteditable.txt b/Tests/LibWeb/Layout/expected/text-collapse-inside-contenteditable.txt
index a9429513bf9..bdc3c9b94f2 100644
--- a/Tests/LibWeb/Layout/expected/text-collapse-inside-contenteditable.txt
+++ b/Tests/LibWeb/Layout/expected/text-collapse-inside-contenteditable.txt
@@ -14,3 +14,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>) [8,8 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,26 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/text-indent.txt b/Tests/LibWeb/Layout/expected/text-indent.txt
index aa507f20352..c7e4cf72704 100644
--- a/Tests/LibWeb/Layout/expected/text-indent.txt
+++ b/Tests/LibWeb/Layout/expected/text-indent.txt
@@ -31,3 +31,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer<DIV>.pct-indent) [10,82 102x74]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x164] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/textarea-content.txt b/Tests/LibWeb/Layout/expected/textarea-content.txt
index 84260377ba7..b53f864145c 100644
--- a/Tests/LibWeb/Layout/expected/textarea-content.txt
+++ b/Tests/LibWeb/Layout/expected/textarea-content.txt
@@ -44,3 +44,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [513,11 240x23]
           PaintableWithLines (BlockContainer<DIV>) [513,11 240x23]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/textarea-reset.txt b/Tests/LibWeb/Layout/expected/textarea-reset.txt
index 0e3763d2287..172b5c9736c 100644
--- a/Tests/LibWeb/Layout/expected/textarea-reset.txt
+++ b/Tests/LibWeb/Layout/expected/textarea-reset.txt
@@ -24,3 +24,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
             PaintableWithLines (BlockContainer<DIV>) [11,11 160x15]
               TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,42 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x50] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/tolerate-css-percentage-overshoot.txt b/Tests/LibWeb/Layout/expected/tolerate-css-percentage-overshoot.txt
index c22bcd07c10..86aafa01044 100644
--- a/Tests/LibWeb/Layout/expected/tolerate-css-percentage-overshoot.txt
+++ b/Tests/LibWeb/Layout/expected/tolerate-css-percentage-overshoot.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<DIV>.larg.red) [8,8 208.328125x100]
       PaintableWithLines (BlockContainer<DIV>.larg.green) [216.328125,8 208.328125x100]
       PaintableWithLines (BlockContainer<DIV>.smol.blue) [424.65625,8 83.328125x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x108] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/top-layer.txt b/Tests/LibWeb/Layout/expected/top-layer.txt
index a222e99dabb..385da689a91 100644
--- a/Tests/LibWeb/Layout/expected/top-layer.txt
+++ b/Tests/LibWeb/Layout/expected/top-layer.txt
@@ -16,3 +16,8 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<DIALOG>#dialog) [177.671875,256 444.65625x88]
     PaintableWithLines (BlockContainer<P>) [196.671875,291 406.65625x18]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 3] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
+ SC for BlockContainer(anonymous) [0,0 800x600] [children: 0] (z-index: auto)
+ SC for BlockContainer<DIALOG>#dialog [196.671875,275 406.65625x50] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/transform-calc-length-values.txt b/Tests/LibWeb/Layout/expected/transform-calc-length-values.txt
index 3942bb9b28f..5738cd37ab9 100644
--- a/Tests/LibWeb/Layout/expected/transform-calc-length-values.txt
+++ b/Tests/LibWeb/Layout/expected/transform-calc-length-values.txt
@@ -5,3 +5,7 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
 ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x118]
     PaintableWithLines (BlockContainer<BODY>) [8,8 102x102]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x118] [children: 1] (z-index: auto)
+  SC for BlockContainer<BODY> [9,9 100x100] [children: 0] (z-index: auto), transform: [1 0 0 1 50 100]
diff --git a/Tests/LibWeb/Layout/expected/treat-intrinsic-sizing-keywords-as-auto-when-aspect-ratio-cant-be-resolved.txt b/Tests/LibWeb/Layout/expected/treat-intrinsic-sizing-keywords-as-auto-when-aspect-ratio-cant-be-resolved.txt
index 6e3cfe20cd1..7fe63d28cc3 100644
--- a/Tests/LibWeb/Layout/expected/treat-intrinsic-sizing-keywords-as-auto-when-aspect-ratio-cant-be-resolved.txt
+++ b/Tests/LibWeb/Layout/expected/treat-intrinsic-sizing-keywords-as-auto-when-aspect-ratio-cant-be-resolved.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x800]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x784]
       SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x784]
         SVGPathPaintable (SVGGeometryBox<rect>) [8,8 392x392]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x800] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/ul-render.txt b/Tests/LibWeb/Layout/expected/ul-render.txt
index 3aceb655a19..3cbf95f6e6c 100644
--- a/Tests/LibWeb/Layout/expected/ul-render.txt
+++ b/Tests/LibWeb/Layout/expected/ul-render.txt
@@ -71,3 +71,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [48,104 744x0]
       PaintableWithLines (BlockContainer(anonymous)) [8,120 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x120] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/unicode-password-input.txt b/Tests/LibWeb/Layout/expected/unicode-password-input.txt
index b5af2ae8dbb..782042ca15a 100644
--- a/Tests/LibWeb/Layout/expected/unicode-password-input.txt
+++ b/Tests/LibWeb/Layout/expected/unicode-password-input.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableBox (Box<DIV>) [9,9 200x20]
           PaintableWithLines (BlockContainer<DIV>) [11,10 196x18]
             TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x38] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/utf-16-be-xhtml-file-should-decode-correctly.txt b/Tests/LibWeb/Layout/expected/utf-16-be-xhtml-file-should-decode-correctly.txt
index 674a1870a21..1479c964235 100644
--- a/Tests/LibWeb/Layout/expected/utf-16-be-xhtml-file-should-decode-correctly.txt
+++ b/Tests/LibWeb/Layout/expected/utf-16-be-xhtml-file-should-decode-correctly.txt
@@ -17,3 +17,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (BlockContainer<P>) [8,16 784x18]
         TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,50 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x50] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/vertical-align-middle.txt b/Tests/LibWeb/Layout/expected/vertical-align-middle.txt
index 49628e4d127..941e5904d3b 100644
--- a/Tests/LibWeb/Layout/expected/vertical-align-middle.txt
+++ b/Tests/LibWeb/Layout/expected/vertical-align-middle.txt
@@ -19,3 +19,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       PaintableWithLines (InlineNode<A>) [8,23 91.296875x50]
         TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer<DIV>.test) [49.296875,8 50x50]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x66] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/vertical-padding-relative-to-cb-width.txt b/Tests/LibWeb/Layout/expected/vertical-padding-relative-to-cb-width.txt
index c3c95ffe70b..59b51d9e76d 100644
--- a/Tests/LibWeb/Layout/expected/vertical-padding-relative-to-cb-width.txt
+++ b/Tests/LibWeb/Layout/expected/vertical-padding-relative-to-cb-width.txt
@@ -25,3 +25,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
           TextPaintable (TextNode<#text>)
         PaintableWithLines (BlockContainer(anonymous)) [11,211 600x18]
           TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [1,1 798x30] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/viewport-overflow-propagation-1.txt b/Tests/LibWeb/Layout/expected/viewport-overflow-propagation-1.txt
index ec71322adb3..6694d6be670 100644
--- a/Tests/LibWeb/Layout/expected/viewport-overflow-propagation-1.txt
+++ b/Tests/LibWeb/Layout/expected/viewport-overflow-propagation-1.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x2016]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x2016]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x2000]
       PaintableWithLines (BlockContainer<DIV>) [8,8 100x2000]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x2016] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/viewport-overflow-propagation-2.txt b/Tests/LibWeb/Layout/expected/viewport-overflow-propagation-2.txt
index 6729183f1cb..d409ba2f7b0 100644
--- a/Tests/LibWeb/Layout/expected/viewport-overflow-propagation-2.txt
+++ b/Tests/LibWeb/Layout/expected/viewport-overflow-propagation-2.txt
@@ -8,3 +8,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x2016]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x2016]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x2000]
       PaintableWithLines (BlockContainer<DIV>.long) [8,8 784x2000]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x2016] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/writing-modes-direction-flex.txt b/Tests/LibWeb/Layout/expected/writing-modes-direction-flex.txt
index ea434b31296..92c7ec98f9b 100644
--- a/Tests/LibWeb/Layout/expected/writing-modes-direction-flex.txt
+++ b/Tests/LibWeb/Layout/expected/writing-modes-direction-flex.txt
@@ -51,3 +51,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
         PaintableWithLines (BlockContainer<DIV>) [64.4375,26 26.671875x18]
           TextPaintable (TextNode<#text>)
       PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x52] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/writing-modes-direction-inline.txt b/Tests/LibWeb/Layout/expected/writing-modes-direction-inline.txt
index e1cc7ece7d9..b65719af883 100644
--- a/Tests/LibWeb/Layout/expected/writing-modes-direction-inline.txt
+++ b/Tests/LibWeb/Layout/expected/writing-modes-direction-inline.txt
@@ -22,3 +22,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
       TextPaintable (TextNode<#text>)
       PaintableWithLines (InlineNode<SPAN>) [744.65625,8 47.34375x18]
         TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/writing-modes-vertical-rl.txt b/Tests/LibWeb/Layout/expected/writing-modes-vertical-rl.txt
index 0ed43171d59..d14b8139b61 100644
--- a/Tests/LibWeb/Layout/expected/writing-modes-vertical-rl.txt
+++ b/Tests/LibWeb/Layout/expected/writing-modes-vertical-rl.txt
@@ -9,3 +9,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x186.265625]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x170.265625]
       TextPaintable (TextNode<#text>)
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x186.265625] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/zero-height-replaced-box-with-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/zero-height-replaced-box-with-aspect-ratio.txt
index 435a276f919..9d6e939187d 100644
--- a/Tests/LibWeb/Layout/expected/zero-height-replaced-box-with-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/zero-height-replaced-box-with-aspect-ratio.txt
@@ -10,3 +10,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 10x0] overflow: [8,8 100x100]
         SVGSVGPaintable (SVGSVGBox<svg>) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/zero-height-viewport-svg-image.txt b/Tests/LibWeb/Layout/expected/zero-height-viewport-svg-image.txt
index fde938e8f3e..010087dc578 100644
--- a/Tests/LibWeb/Layout/expected/zero-height-viewport-svg-image.txt
+++ b/Tests/LibWeb/Layout/expected/zero-height-viewport-svg-image.txt
@@ -12,3 +12,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x166]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x150]
       ImagePaintable (ImageBox<IMG>) [8,8 300x150]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/zero-size-replaced-box-with-aspect-ratio.txt b/Tests/LibWeb/Layout/expected/zero-size-replaced-box-with-aspect-ratio.txt
index 8e1a95df733..e22deaf540d 100644
--- a/Tests/LibWeb/Layout/expected/zero-size-replaced-box-with-aspect-ratio.txt
+++ b/Tests/LibWeb/Layout/expected/zero-size-replaced-box-with-aspect-ratio.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
       PaintableWithLines (BlockContainer<DIV>) [8,8 0x0] overflow: [8,8 100x100]
         SVGSVGPaintable (SVGSVGBox<svg>) [8,8 100x100]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x16] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/zero-width-viewport-svg-image.txt b/Tests/LibWeb/Layout/expected/zero-width-viewport-svg-image.txt
index ecb19b12305..8dba44d82bb 100644
--- a/Tests/LibWeb/Layout/expected/zero-width-viewport-svg-image.txt
+++ b/Tests/LibWeb/Layout/expected/zero-width-viewport-svg-image.txt
@@ -11,3 +11,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
   PaintableWithLines (BlockContainer<HTML>) [0,0 800x166]
     PaintableWithLines (BlockContainer<BODY>) [8,8 784x150]
       ImagePaintable (ImageBox<IMG>) [8,8 300x150]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x166] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/Layout/expected/zero_percent_width_nested_table.txt b/Tests/LibWeb/Layout/expected/zero_percent_width_nested_table.txt
index bdb6473e79b..295958e0077 100644
--- a/Tests/LibWeb/Layout/expected/zero_percent_width_nested_table.txt
+++ b/Tests/LibWeb/Layout/expected/zero_percent_width_nested_table.txt
@@ -28,3 +28,6 @@ ViewportPaintable (Viewport<#document>) [0,0 800x600]
                       PaintableBox (Box<TR>) [13,13 2x2]
                         PaintableWithLines (BlockContainer<TD>) [13,13 2x2]
                           PaintableWithLines (BlockContainer(anonymous)) [14,14 0x0]
+
+SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
+ SC for BlockContainer<HTML> [0,0 800x28] [children: 0] (z-index: auto)
diff --git a/Tests/LibWeb/test-web/main.cpp b/Tests/LibWeb/test-web/main.cpp
index 3bfeb1bcff7..e43c2d5a356 100644
--- a/Tests/LibWeb/test-web/main.cpp
+++ b/Tests/LibWeb/test-web/main.cpp
@@ -249,7 +249,7 @@ static void run_dump_test(TestWebView& view, Test& test, URL::URL const& url, in
             // NOTE: We take a screenshot here to force the lazy layout of SVG-as-image documents to happen.
             //       It also causes a lot more code to run, which is good for finding bugs. :^)
             view.take_screenshot()->when_resolved([&view, &test, on_test_complete = move(on_test_complete)](auto) {
-                auto promise = view.request_internal_page_info(WebView::PageInfoType::LayoutTree | WebView::PageInfoType::PaintTree);
+                auto promise = view.request_internal_page_info(WebView::PageInfoType::LayoutTree | WebView::PageInfoType::PaintTree | WebView::PageInfoType::StackingContextTree);
 
                 promise->when_resolved([&test, on_test_complete = move(on_test_complete)](auto const& text) {
                     test.text = text;