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.
Author: https://github.com/awesomekling Commit: dab1fd265d Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5369 Reviewed-by: https://github.com/gmta ✅
2025-07-29 04:09:13 +00:00 · 2025-07-06 14:45:04 +02:00 · 2025-07-06 14:45:04 +02:00 · dab1fd265d · 2025-07-09 12:38:27 +00:00
commit dab1fd265d
parent f46bd7f5eb
776 changed files with 2365 additions and 9 deletions
--- 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);
 }

 }
--- 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();

--- 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);
--- 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);
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- 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)
--- a/Show more
+++ b/Show more