diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/animations/display-interpolation.tentative.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/animations/display-interpolation.tentative.txt
new file mode 100644
index 00000000000..b8cf1bf58a3
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/animations/display-interpolation.tentative.txt
@@ -0,0 +1,24 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 14 tests
+
+14 Pass
+Details
+Result	Test Name	MessagePass	CSS Animations: property <display> from [grid] to [flex] at (-0.3) should be [grid]	
+Pass	CSS Animations: property <display> from [grid] to [flex] at (0) should be [grid]	
+Pass	CSS Animations: property <display> from [grid] to [flex] at (0.3) should be [grid]	
+Pass	CSS Animations: property <display> from [grid] to [flex] at (0.5) should be [flex]	
+Pass	CSS Animations: property <display> from [grid] to [flex] at (0.6) should be [flex]	
+Pass	CSS Animations: property <display> from [grid] to [flex] at (1) should be [flex]	
+Pass	CSS Animations: property <display> from [grid] to [flex] at (1.5) should be [flex]	
+Pass	Web Animations: property <display> from [grid] to [flex] at (-0.3) should be [grid]	
+Pass	Web Animations: property <display> from [grid] to [flex] at (0) should be [grid]	
+Pass	Web Animations: property <display> from [grid] to [flex] at (0.3) should be [grid]	
+Pass	Web Animations: property <display> from [grid] to [flex] at (0.5) should be [flex]	
+Pass	Web Animations: property <display> from [grid] to [flex] at (0.6) should be [flex]	
+Pass	Web Animations: property <display> from [grid] to [flex] at (1) should be [flex]	
+Pass	Web Animations: property <display> from [grid] to [flex] at (1.5) should be [flex]	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/animations/display-interpolation.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/animations/display-interpolation.txt
new file mode 100644
index 00000000000..a077ab0aa85
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/animations/display-interpolation.txt
@@ -0,0 +1,53 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 42 tests
+
+28 Pass
+14 Fail
+Details
+Result	Test Name	MessagePass	CSS Transitions with transition-behavior:allow-discrete: property <display> from [none] to [flex] at (-0.3) should be [flex]	
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <display> from [none] to [flex] at (0) should be [flex]	
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <display> from [none] to [flex] at (0.3) should be [flex]	
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <display> from [none] to [flex] at (0.5) should be [flex]	
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <display> from [none] to [flex] at (0.6) should be [flex]	
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <display> from [none] to [flex] at (1) should be [flex]	
+Pass	CSS Transitions with transition-behavior:allow-discrete: property <display> from [none] to [flex] at (1.5) should be [flex]	
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <display> from [none] to [flex] at (-0.3) should be [flex]	
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <display> from [none] to [flex] at (0) should be [flex]	
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <display> from [none] to [flex] at (0.3) should be [flex]	
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <display> from [none] to [flex] at (0.5) should be [flex]	
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <display> from [none] to [flex] at (0.6) should be [flex]	
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <display> from [none] to [flex] at (1) should be [flex]	
+Pass	CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <display> from [none] to [flex] at (1.5) should be [flex]	
+Pass	CSS Transitions: property <display> from [none] to [flex] at (-0.3) should be [flex]	
+Pass	CSS Transitions: property <display> from [none] to [flex] at (0) should be [flex]	
+Pass	CSS Transitions: property <display> from [none] to [flex] at (0.3) should be [flex]	
+Pass	CSS Transitions: property <display> from [none] to [flex] at (0.5) should be [flex]	
+Pass	CSS Transitions: property <display> from [none] to [flex] at (0.6) should be [flex]	
+Pass	CSS Transitions: property <display> from [none] to [flex] at (1) should be [flex]	
+Pass	CSS Transitions: property <display> from [none] to [flex] at (1.5) should be [flex]	
+Pass	CSS Transitions with transition: all: property <display> from [none] to [flex] at (-0.3) should be [flex]	
+Pass	CSS Transitions with transition: all: property <display> from [none] to [flex] at (0) should be [flex]	
+Pass	CSS Transitions with transition: all: property <display> from [none] to [flex] at (0.3) should be [flex]	
+Pass	CSS Transitions with transition: all: property <display> from [none] to [flex] at (0.5) should be [flex]	
+Pass	CSS Transitions with transition: all: property <display> from [none] to [flex] at (0.6) should be [flex]	
+Pass	CSS Transitions with transition: all: property <display> from [none] to [flex] at (1) should be [flex]	
+Pass	CSS Transitions with transition: all: property <display> from [none] to [flex] at (1.5) should be [flex]	
+Fail	CSS Animations: property <display> from [none] to [flex] at (-0.3) should be [block]	
+Fail	CSS Animations: property <display> from [none] to [flex] at (0) should be [block]	
+Fail	CSS Animations: property <display> from [none] to [flex] at (0.3) should be [block]	
+Fail	CSS Animations: property <display> from [none] to [flex] at (0.5) should be [block]	
+Fail	CSS Animations: property <display> from [none] to [flex] at (0.6) should be [block]	
+Fail	CSS Animations: property <display> from [none] to [flex] at (1) should be [block]	
+Fail	CSS Animations: property <display> from [none] to [flex] at (1.5) should be [block]	
+Fail	Web Animations: property <display> from [none] to [flex] at (-0.3) should be [block]	
+Fail	Web Animations: property <display> from [none] to [flex] at (0) should be [block]	
+Fail	Web Animations: property <display> from [none] to [flex] at (0.3) should be [block]	
+Fail	Web Animations: property <display> from [none] to [flex] at (0.5) should be [block]	
+Fail	Web Animations: property <display> from [none] to [flex] at (0.6) should be [block]	
+Fail	Web Animations: property <display> from [none] to [flex] at (1) should be [block]	
+Fail	Web Animations: property <display> from [none] to [flex] at (1.5) should be [block]	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-blockify-dynamic.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-blockify-dynamic.txt
new file mode 100644
index 00000000000..9597126e438
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-blockify-dynamic.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Fail
+Details
+Result	Test Name	MessageFail	Dynamic changes to `display` causing blockification of children are handled correctly	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-computed-style.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-computed-style.txt
new file mode 100644
index 00000000000..edb181db022
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-computed-style.txt
@@ -0,0 +1,15 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 5 tests
+
+5 Pass
+Details
+Result	Test Name	MessagePass	Serialization of computed style value for display:contents	
+Pass	display:contents element as inherit parent - explicit inheritance	
+Pass	display:contents element as inherit parent - implicit inheritance	
+Pass	Resolved value should be computed value, not used value, for display:contents	
+Pass	display:contents is blockified for root elements	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-focusable-001.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-focusable-001.txt
new file mode 100644
index 00000000000..c3f82efb74b
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-focusable-001.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Fail
+Details
+Result	Test Name	MessageFail	element with display:contents is focusable	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-parsing-001.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-parsing-001.txt
new file mode 100644
index 00000000000..a7a52c7c83f
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-parsing-001.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Pass
+Details
+Result	Test Name	MessagePass	Tests that the 'contents' value for the 'display' property is correctly parsed	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-svg-anchor-child.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-svg-anchor-child.txt
new file mode 100644
index 00000000000..56112cb81d0
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-svg-anchor-child.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Pass
+Details
+Result	Test Name	MessagePass	Loading this page should not cause a crash.	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-svg-switch-child.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-svg-switch-child.txt
new file mode 100644
index 00000000000..56112cb81d0
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-contents-svg-switch-child.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Pass
+Details
+Result	Test Name	MessagePass	Loading this page should not cause a crash.	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-first-line-001.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-first-line-001.txt
new file mode 100644
index 00000000000..9d8878d554e
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-first-line-001.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Fail
+Details
+Result	Test Name	MessageFail	display of first-letter and first-line	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-list-item-height-after-dom-change.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-list-item-height-after-dom-change.txt
new file mode 100644
index 00000000000..e7535c04974
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-list-item-height-after-dom-change.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Pass
+Details
+Result	Test Name	MessagePass	List item height after DOM change.	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-math-on-non-mathml-elements.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-math-on-non-mathml-elements.txt
new file mode 100644
index 00000000000..efb3b53bdce
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-math-on-non-mathml-elements.txt
@@ -0,0 +1,21 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 10 tests
+
+8 Pass
+2 Fail
+Details
+Result	Test Name	MessageFail	computed display on <div style="display: math;">	
+Pass	computed display on <div style="display: inline math;">	
+Pass	computed display on <div style="display: math inline;">	
+Pass	computed display on <div style="display: block math;">	
+Pass	computed display on <div style="display: math block;">	
+Fail	computed display on <svg style="display: math;">	
+Pass	computed display on <svg style="display: inline math;">	
+Pass	computed display on <svg style="display: math inline;">	
+Pass	computed display on <svg style="display: block math;">	
+Pass	computed display on <svg style="display: math block;">	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-math-on-pseudo-elements-001.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-math-on-pseudo-elements-001.txt
new file mode 100644
index 00000000000..3a4ebf37bff
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-math-on-pseudo-elements-001.txt
@@ -0,0 +1,17 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 6 tests
+
+1 Pass
+5 Fail
+Details
+Result	Test Name	MessagePass	computed display on ::before and ::after for <div class="block">	
+Fail	computed display on ::before and ::after for <math class="block">	
+Fail	computed display on ::before and ::after for <mrow class="block">	
+Fail	computed display on ::before and ::after for <div class="inline">	
+Fail	computed display on ::before and ::after for <math class="inline">	
+Fail	computed display on ::before and ::after for <mrow class="inline">	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-with-float-dynamic.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-with-float-dynamic.txt
new file mode 100644
index 00000000000..c87f9271230
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-with-float-dynamic.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Pass
+Details
+Result	Test Name	MessagePass	computed style for float	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-with-float.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-with-float.txt
new file mode 100644
index 00000000000..c87f9271230
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/display-with-float.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Pass
+Details
+Result	Test Name	MessagePass	computed style for float	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/inheritance.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/inheritance.txt
new file mode 100644
index 00000000000..2935b629625
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/inheritance.txt
@@ -0,0 +1,12 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 2 tests
+
+2 Pass
+Details
+Result	Test Name	MessagePass	Property display has initial value inline	
+Pass	Property display does not inherit	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-computed.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-computed.txt
new file mode 100644
index 00000000000..0dc89b7d9a9
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-computed.txt
@@ -0,0 +1,123 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 112 tests
+
+88 Pass
+24 Fail
+Details
+Result	Test Name	MessagePass	Property display value 'grid'	
+Pass	Property display value 'inline-grid'	
+Pass	Property display value 'inline'	
+Pass	Property display value 'block'	
+Pass	Property display value 'list-item'	
+Pass	Property display value 'inline-block'	
+Pass	Property display value 'table'	
+Pass	Property display value 'inline-table'	
+Pass	Property display value 'table-row-group'	
+Pass	Property display value 'table-header-group'	
+Pass	Property display value 'table-footer-group'	
+Pass	Property display value 'table-row'	
+Pass	Property display value 'table-column-group'	
+Pass	Property display value 'table-column'	
+Pass	Property display value 'table-cell'	
+Pass	Property display value 'table-caption'	
+Pass	Property display value 'none'	
+Pass	Property display value 'flex'	
+Pass	Property display value 'inline-flex'	
+Pass	Property display value 'contents'	
+Pass	Property display value 'run-in'	
+Pass	Property display value 'flow'	
+Pass	Property display value 'flow-root'	
+Pass	Property display value 'ruby'	
+Pass	Property display value 'ruby-base'	
+Pass	Property display value 'ruby-text'	
+Pass	Property display value 'flow list-item'	
+Pass	Property display value 'list-item flow'	
+Fail	Property display value 'flow-root list-item'	
+Fail	Property display value 'list-item flow-root'	
+Pass	Property display value 'block flow'	
+Pass	Property display value 'flow block'	
+Pass	Property display value 'flow-root block'	
+Pass	Property display value 'block flow-root'	
+Pass	Property display value 'flex block'	
+Pass	Property display value 'block flex'	
+Pass	Property display value 'grid block'	
+Pass	Property display value 'block grid'	
+Pass	Property display value 'table block'	
+Pass	Property display value 'block table'	
+Pass	Property display value 'block ruby'	
+Pass	Property display value 'ruby block'	
+Pass	Property display value 'block list-item'	
+Pass	Property display value 'list-item block'	
+Pass	Property display value 'flow block list-item'	
+Pass	Property display value 'block flow list-item'	
+Pass	Property display value 'flow list-item block'	
+Pass	Property display value 'block list-item flow'	
+Pass	Property display value 'list-item block flow'	
+Pass	Property display value 'list-item flow block'	
+Fail	Property display value 'flow-root block list-item'	
+Fail	Property display value 'block flow-root list-item'	
+Fail	Property display value 'flow-root list-item block'	
+Fail	Property display value 'block list-item flow-root'	
+Fail	Property display value 'list-item block flow-root'	
+Fail	Property display value 'list-item flow-root block'	
+Pass	Property display value 'inline flow'	
+Pass	Property display value 'flow inline'	
+Pass	Property display value 'flow-root inline'	
+Pass	Property display value 'inline flow-root'	
+Pass	Property display value 'flex inline'	
+Pass	Property display value 'inline flex'	
+Pass	Property display value 'grid inline'	
+Pass	Property display value 'inline grid'	
+Pass	Property display value 'table inline'	
+Pass	Property display value 'inline table'	
+Pass	Property display value 'inline ruby'	
+Pass	Property display value 'ruby inline'	
+Fail	Property display value 'inline list-item'	
+Fail	Property display value 'list-item inline'	
+Fail	Property display value 'flow inline list-item'	
+Fail	Property display value 'inline flow list-item'	
+Fail	Property display value 'flow list-item inline'	
+Fail	Property display value 'inline list-item flow'	
+Fail	Property display value 'list-item inline flow'	
+Fail	Property display value 'list-item flow inline'	
+Pass	Property display value 'flow-root inline list-item'	
+Pass	Property display value 'inline flow-root list-item'	
+Pass	Property display value 'flow-root list-item inline'	
+Pass	Property display value 'inline list-item flow-root'	
+Pass	Property display value 'list-item inline flow-root'	
+Pass	Property display value 'list-item flow-root inline'	
+Pass	Property display value 'run-in flow'	
+Pass	Property display value 'flow run-in'	
+Pass	Property display value 'flow-root run-in'	
+Pass	Property display value 'run-in flow-root'	
+Pass	Property display value 'flex run-in'	
+Pass	Property display value 'run-in flex'	
+Pass	Property display value 'grid run-in'	
+Pass	Property display value 'run-in grid'	
+Pass	Property display value 'table run-in'	
+Pass	Property display value 'run-in table'	
+Pass	Property display value 'run-in ruby'	
+Pass	Property display value 'ruby run-in'	
+Fail	Property display value 'run-in list-item'	
+Fail	Property display value 'list-item run-in'	
+Fail	Property display value 'flow run-in list-item'	
+Fail	Property display value 'run-in flow list-item'	
+Fail	Property display value 'flow list-item run-in'	
+Fail	Property display value 'run-in list-item flow'	
+Fail	Property display value 'list-item run-in flow'	
+Fail	Property display value 'list-item flow run-in'	
+Pass	Property display value 'flow-root run-in list-item'	
+Pass	Property display value 'run-in flow-root list-item'	
+Pass	Property display value 'flow-root list-item run-in'	
+Pass	Property display value 'run-in list-item flow-root'	
+Pass	Property display value 'list-item run-in flow-root'	
+Pass	Property display value 'list-item flow-root run-in'	
+Pass	position absolute affects computed display	
+Pass	position fixed affects computed display	
+Pass	float left affects computed display	
+Pass	float right affects computed display	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-invalid.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-invalid.txt
new file mode 100644
index 00000000000..27c947199b5
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-invalid.txt
@@ -0,0 +1,65 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 55 tests
+
+55 Pass
+Details
+Result	Test Name	MessagePass	e.style['display'] = "grid inline-grid" should not set the property value	
+Pass	e.style['display'] = "none grid" should not set the property value	
+Pass	e.style['display'] = "none flow" should not set the property value	
+Pass	e.style['display'] = "none ruby" should not set the property value	
+Pass	e.style['display'] = "none flow-root" should not set the property value	
+Pass	e.style['display'] = "none list-item" should not set the property value	
+Pass	e.style['display'] = "contents list-item" should not set the property value	
+Pass	e.style['display'] = "list-item contents" should not set the property value	
+Pass	e.style['display'] = "flow flow" should not set the property value	
+Pass	e.style['display'] = "block block" should not set the property value	
+Pass	e.style['display'] = "flow flow-root" should not set the property value	
+Pass	e.style['display'] = "flow-root flow-root" should not set the property value	
+Pass	e.style['display'] = "block inline" should not set the property value	
+Pass	e.style['display'] = "flex ruby" should not set the property value	
+Pass	e.style['display'] = "ruby flex" should not set the property value	
+Pass	e.style['display'] = "inline inline" should not set the property value	
+Pass	e.style['display'] = "flex flex" should not set the property value	
+Pass	e.style['display'] = "grid flex" should not set the property value	
+Pass	e.style['display'] = "ruby grid" should not set the property value	
+Pass	e.style['display'] = "flex grid" should not set the property value	
+Pass	e.style['display'] = "grid table" should not set the property value	
+Pass	e.style['display'] = "table flex" should not set the property value	
+Pass	e.style['display'] = "flex table" should not set the property value	
+Pass	e.style['display'] = "ruby table" should not set the property value	
+Pass	e.style['display'] = "table table" should not set the property value	
+Pass	e.style['display'] = "table flow-root" should not set the property value	
+Pass	e.style['display'] = "flow-root ruby" should not set the property value	
+Pass	e.style['display'] = "list-item list-item" should not set the property value	
+Pass	e.style['display'] = "list-item table" should not set the property value	
+Pass	e.style['display'] = "flex list-item" should not set the property value	
+Pass	e.style['display'] = "list-item grid" should not set the property value	
+Pass	e.style['display'] = "flow flow list-item" should not set the property value	
+Pass	e.style['display'] = "grid flow list-item" should not set the property value	
+Pass	e.style['display'] = "flow list-item flow" should not set the property value	
+Pass	e.style['display'] = "block list-item block" should not set the property value	
+Pass	e.style['display'] = "list-item flow-root flow" should not set the property value	
+Pass	e.style['display'] = "list-item block block" should not set the property value	
+Pass	e.style['display'] = "list-item block list-item" should not set the property value	
+Pass	e.style['display'] = "list-item flow-root list-item" should not set the property value	
+Pass	e.style['display'] = "list-item flow-root block list-item" should not set the property value	
+Pass	e.style['display'] = "list-item block flow-root list-item" should not set the property value	
+Pass	e.style['display'] = "block list-item flow-root list-item" should not set the property value	
+Pass	e.style['display'] = "flow-root list-item block list-item" should not set the property value	
+Pass	e.style['display'] = "list-item ruby" should not set the property value	
+Pass	e.style['display'] = "ruby list-item" should not set the property value	
+Pass	e.style['display'] = "ruby ruby" should not set the property value	
+Pass	e.style['display'] = "ruby flow" should not set the property value	
+Pass	e.style['display'] = "flow ruby" should not set the property value	
+Pass	e.style['display'] = "ruby flow-root" should not set the property value	
+Pass	e.style['display'] = "grid ruby" should not set the property value	
+Pass	e.style['display'] = "table ruby" should not set the property value	
+Pass	e.style['display'] = "table-row flow" should not set the property value	
+Pass	e.style['display'] = "flow table-row" should not set the property value	
+Pass	e.style['display'] = "table-row-group flow-root" should not set the property value	
+Pass	e.style['display'] = "flex table-row-group" should not set the property value	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-valid.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-valid.txt
new file mode 100644
index 00000000000..9fccb0333fb
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/parsing/display-valid.txt
@@ -0,0 +1,119 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 108 tests
+
+84 Pass
+24 Fail
+Details
+Result	Test Name	MessagePass	e.style['display'] = "grid" should set the property value	
+Pass	e.style['display'] = "inline-grid" should set the property value	
+Pass	e.style['display'] = "inline" should set the property value	
+Pass	e.style['display'] = "block" should set the property value	
+Pass	e.style['display'] = "list-item" should set the property value	
+Pass	e.style['display'] = "inline-block" should set the property value	
+Pass	e.style['display'] = "table" should set the property value	
+Pass	e.style['display'] = "inline-table" should set the property value	
+Pass	e.style['display'] = "table-row-group" should set the property value	
+Pass	e.style['display'] = "table-header-group" should set the property value	
+Pass	e.style['display'] = "table-footer-group" should set the property value	
+Pass	e.style['display'] = "table-row" should set the property value	
+Pass	e.style['display'] = "table-column-group" should set the property value	
+Pass	e.style['display'] = "table-column" should set the property value	
+Pass	e.style['display'] = "table-cell" should set the property value	
+Pass	e.style['display'] = "table-caption" should set the property value	
+Pass	e.style['display'] = "none" should set the property value	
+Pass	e.style['display'] = "flex" should set the property value	
+Pass	e.style['display'] = "inline-flex" should set the property value	
+Pass	e.style['display'] = "contents" should set the property value	
+Pass	e.style['display'] = "run-in" should set the property value	
+Pass	e.style['display'] = "flow" should set the property value	
+Pass	e.style['display'] = "flow-root" should set the property value	
+Pass	e.style['display'] = "ruby" should set the property value	
+Pass	e.style['display'] = "ruby-base" should set the property value	
+Pass	e.style['display'] = "ruby-text" should set the property value	
+Pass	e.style['display'] = "flow list-item" should set the property value	
+Pass	e.style['display'] = "list-item flow" should set the property value	
+Fail	e.style['display'] = "flow-root list-item" should set the property value	
+Fail	e.style['display'] = "list-item flow-root" should set the property value	
+Pass	e.style['display'] = "block flow" should set the property value	
+Pass	e.style['display'] = "flow block" should set the property value	
+Pass	e.style['display'] = "flow-root block" should set the property value	
+Pass	e.style['display'] = "block flow-root" should set the property value	
+Pass	e.style['display'] = "flex block" should set the property value	
+Pass	e.style['display'] = "block flex" should set the property value	
+Pass	e.style['display'] = "grid block" should set the property value	
+Pass	e.style['display'] = "block grid" should set the property value	
+Pass	e.style['display'] = "table block" should set the property value	
+Pass	e.style['display'] = "block table" should set the property value	
+Pass	e.style['display'] = "block ruby" should set the property value	
+Pass	e.style['display'] = "ruby block" should set the property value	
+Pass	e.style['display'] = "block list-item" should set the property value	
+Pass	e.style['display'] = "list-item block" should set the property value	
+Pass	e.style['display'] = "flow block list-item" should set the property value	
+Pass	e.style['display'] = "block flow list-item" should set the property value	
+Pass	e.style['display'] = "flow list-item block" should set the property value	
+Pass	e.style['display'] = "block list-item flow" should set the property value	
+Pass	e.style['display'] = "list-item block flow" should set the property value	
+Pass	e.style['display'] = "list-item flow block" should set the property value	
+Fail	e.style['display'] = "flow-root block list-item" should set the property value	
+Fail	e.style['display'] = "block flow-root list-item" should set the property value	
+Fail	e.style['display'] = "flow-root list-item block" should set the property value	
+Fail	e.style['display'] = "block list-item flow-root" should set the property value	
+Fail	e.style['display'] = "list-item block flow-root" should set the property value	
+Fail	e.style['display'] = "list-item flow-root block" should set the property value	
+Pass	e.style['display'] = "inline flow" should set the property value	
+Pass	e.style['display'] = "flow inline" should set the property value	
+Pass	e.style['display'] = "flow-root inline" should set the property value	
+Pass	e.style['display'] = "inline flow-root" should set the property value	
+Pass	e.style['display'] = "flex inline" should set the property value	
+Pass	e.style['display'] = "inline flex" should set the property value	
+Pass	e.style['display'] = "grid inline" should set the property value	
+Pass	e.style['display'] = "inline grid" should set the property value	
+Pass	e.style['display'] = "table inline" should set the property value	
+Pass	e.style['display'] = "inline table" should set the property value	
+Pass	e.style['display'] = "inline ruby" should set the property value	
+Pass	e.style['display'] = "ruby inline" should set the property value	
+Fail	e.style['display'] = "inline list-item" should set the property value	
+Fail	e.style['display'] = "list-item inline" should set the property value	
+Fail	e.style['display'] = "flow inline list-item" should set the property value	
+Fail	e.style['display'] = "inline flow list-item" should set the property value	
+Fail	e.style['display'] = "flow list-item inline" should set the property value	
+Fail	e.style['display'] = "inline list-item flow" should set the property value	
+Fail	e.style['display'] = "list-item inline flow" should set the property value	
+Fail	e.style['display'] = "list-item flow inline" should set the property value	
+Pass	e.style['display'] = "flow-root inline list-item" should set the property value	
+Pass	e.style['display'] = "inline flow-root list-item" should set the property value	
+Pass	e.style['display'] = "flow-root list-item inline" should set the property value	
+Pass	e.style['display'] = "inline list-item flow-root" should set the property value	
+Pass	e.style['display'] = "list-item inline flow-root" should set the property value	
+Pass	e.style['display'] = "list-item flow-root inline" should set the property value	
+Pass	e.style['display'] = "run-in flow" should set the property value	
+Pass	e.style['display'] = "flow run-in" should set the property value	
+Pass	e.style['display'] = "flow-root run-in" should set the property value	
+Pass	e.style['display'] = "run-in flow-root" should set the property value	
+Pass	e.style['display'] = "flex run-in" should set the property value	
+Pass	e.style['display'] = "run-in flex" should set the property value	
+Pass	e.style['display'] = "grid run-in" should set the property value	
+Pass	e.style['display'] = "run-in grid" should set the property value	
+Pass	e.style['display'] = "table run-in" should set the property value	
+Pass	e.style['display'] = "run-in table" should set the property value	
+Pass	e.style['display'] = "run-in ruby" should set the property value	
+Pass	e.style['display'] = "ruby run-in" should set the property value	
+Fail	e.style['display'] = "run-in list-item" should set the property value	
+Fail	e.style['display'] = "list-item run-in" should set the property value	
+Fail	e.style['display'] = "flow run-in list-item" should set the property value	
+Fail	e.style['display'] = "run-in flow list-item" should set the property value	
+Fail	e.style['display'] = "flow list-item run-in" should set the property value	
+Fail	e.style['display'] = "run-in list-item flow" should set the property value	
+Fail	e.style['display'] = "list-item run-in flow" should set the property value	
+Fail	e.style['display'] = "list-item flow run-in" should set the property value	
+Pass	e.style['display'] = "flow-root run-in list-item" should set the property value	
+Pass	e.style['display'] = "run-in flow-root list-item" should set the property value	
+Pass	e.style['display'] = "flow-root list-item run-in" should set the property value	
+Pass	e.style['display'] = "run-in list-item flow-root" should set the property value	
+Pass	e.style['display'] = "list-item run-in flow-root" should set the property value	
+Pass	e.style['display'] = "list-item flow-root run-in" should set the property value	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-display/textarea-display.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/textarea-display.txt
new file mode 100644
index 00000000000..5ee48d1d2e5
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-display/textarea-display.txt
@@ -0,0 +1,11 @@
+Summary
+
+Harness status: OK
+
+Rerun
+
+Found 1 tests
+
+1 Pass
+Details
+Result	Test Name	MessagePass	textarea has inline block display	
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/animations/display-interpolation.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/animations/display-interpolation.html
new file mode 100644
index 00000000000..f6c4005f338
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/animations/display-interpolation.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>display interpolation</title>
+<link rel="help" href="https://www.w3.org/TR/CSS2/visuren.html#display-prop">
+<meta name="assert" content="display supports animation">
+
+<script src="../../../resources/testharness.js"></script>
+<script src="../../../resources/testharnessreport.js"></script>
+<script src="../../support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+test_not_animatable({
+  property: 'display',
+  from: 'none',
+  to: 'flex',
+  underlying: 'block'
+});
+</script>
+</body>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/animations/display-interpolation.tentative.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/animations/display-interpolation.tentative.html
new file mode 100644
index 00000000000..4fc1bd58953
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/animations/display-interpolation.tentative.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>display interpolation</title>
+<link rel="help" href="https://www.w3.org/TR/CSS2/visuren.html#display-prop">
+<meta name="assert" content="display supports animation">
+
+<script src="../../../resources/testharness.js"></script>
+<script src="../../../resources/testharnessreport.js"></script>
+<script src="../../support/interpolation-testcommon.js"></script>
+
+<body>
+  <script>
+    test_no_interpolation({
+      property: 'display',
+      from: 'grid',
+      to: 'flex',
+      underlying: 'block',
+      target_names: ['CSS Animations', 'Web Animations']
+    });
+  </script>
+</body>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-blockify-dynamic.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-blockify-dynamic.html
new file mode 100644
index 00000000000..7c5ba6870f5
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-blockify-dynamic.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1561283">
+<link rel="help" href="https://drafts.csswg.org/css-display/#valdef-display-contents">
+<link rel="help" href="https://drafts.csswg.org/css-grid/#grid-item-display">
+<link rel="author" href="https://mozilla.org" title="Mozilla">
+<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
+<link rel="author" href="mailto:obrufau@igalia.com" title="Oriol Brufau">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<style>
+  .grid { display: grid }
+</style>
+<div style="display: grid">
+  <span id="grid-child">
+    <span></span>
+  </div>
+</div>
+<script>
+function display(el) {
+  return getComputedStyle(el).display;
+}
+test(function() {
+  let child = document.getElementById("grid-child");
+  let grandChild = child.firstElementChild;
+  assert_equals(display(child), "block", "Grid child should get blockified");
+  assert_equals(display(grandChild), "inline", "Grid grand-child should not get initially blockified");
+  child.style.display = "contents";
+  assert_equals(display(child), "contents", "No reason for it not to become display: contents");
+  assert_equals(display(grandChild), "block", "Grid grand-child with display: contents parent should get blockified");
+  child.style.display = "";
+  assert_equals(display(child), "block", "Grid child should get blockified");
+  assert_equals(display(grandChild), "inline", "Grid grand-child should get un-blockified when its parent's display stops being `contents`");
+}, "Dynamic changes to `display` causing blockification of children are handled correctly");
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-computed-style.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-computed-style.html
new file mode 100644
index 00000000000..917bd417221
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-computed-style.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Display: Computed style for display:contents</title>
+<link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
+<link rel="help" href="https://drafts.csswg.org/css-display-3/#valdef-display-contents">
+<link rel="help" href="https://drafts.csswg.org/css-display-3/#transformations">
+<link rel="help" href="https://drafts.csswg.org/cssom-1/#resolved-values">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<style>
+    html, .contents { display: contents }
+
+    #t2 .contents { background-color: green }
+    #t2 span { background-color: inherit }
+
+    #t3 .contents { color: green }
+
+    #t4 {
+        width: auto;
+        height: 50%;
+        margin-left: 25%;
+        padding-top: 10%;
+    }
+</style>
+<div id="t1" class="contents"></div>
+<div id="t2">
+    <div class="contents">
+        <span></span>
+    </div>
+</div>
+<div id="t3">
+    <div class="contents">
+        <span></span>
+    </div>
+</div>
+<div id="t4" class="contents"></div>
+<script>
+    test(function(){
+        assert_equals(getComputedStyle(document.querySelector("#t1")).display, "contents");
+    }, "Serialization of computed style value for display:contents");
+
+    test(function(){
+        assert_equals(getComputedStyle(document.querySelector("#t2 span")).backgroundColor, "rgb(0, 128, 0)");
+    }, "display:contents element as inherit parent - explicit inheritance");
+
+    test(function(){
+        assert_equals(getComputedStyle(document.querySelector("#t3 span")).color, "rgb(0, 128, 0)");
+    }, "display:contents element as inherit parent - implicit inheritance");
+
+    test(function(){
+        var computed = getComputedStyle(document.querySelector("#t4"));
+        assert_equals(computed.width, "auto");
+        assert_equals(computed.height, "50%");
+        assert_equals(computed.marginLeft, "25%");
+        assert_equals(computed.paddingTop, "10%");
+    }, "Resolved value should be computed value, not used value, for display:contents");
+
+    test(function(){
+        assert_equals(getComputedStyle(document.documentElement).display, "block");
+    }, "display:contents is blockified for root elements");
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-focusable-001.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-focusable-001.html
new file mode 100644
index 00000000000..0921b4f6d37
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-focusable-001.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<title>CSS Test (Display): Elements with display:contents should be focusable</title>
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Google" href="http://www.google.com/">
+<link rel="help" href="https://drafts.csswg.org/css-display-3/#box-generation">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/2632">
+<link rel="help" href="https://github.com/whatwg/html/issues/1837">
+<link rel="help" href="https://github.com/whatwg/html/pull/9425">
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1366037">
+<!--
+
+  This requirement may not be crystal-clear from CSS specs, but
+  discussion in https://github.com/w3c/csswg-drafts/issues/2632
+  concluded it was correct and that no spec changes were needed.
+
+  https://github.com/whatwg/html/pull/9425 makes this clearer in the
+  HTML spec.
+
+-->
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<style>
+
+#test       { --test-var: test-not-focused; }
+#test:focus { --test-var: test-focused; }
+
+</style>
+
+<div id="test" style="display: contents" tabindex="1">Hello</div>
+
+<script>
+
+  test(
+    function() {
+      var e = document.getElementById("test");
+      var cs = getComputedStyle(e);
+      assert_not_equals(document.activeElement, e, "precondition");
+      assert_equals(cs.getPropertyValue("--test-var"), "test-not-focused", "precondition (style)");
+      e.focus();
+      assert_equals(document.activeElement, e, "e is now focused");
+      assert_equals(cs.getPropertyValue("--test-var"), "test-focused", "e is now focused (style)");
+    }, "element with display:contents is focusable");
+
+</script>
+
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-parsing-001.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-parsing-001.html
new file mode 100644
index 00000000000..b049dc9298d
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-parsing-001.html
@@ -0,0 +1,43 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Tests that the 'contents' value for the 'display' property is correctly parsed</title>
+<link rel="help" href="https://drafts.csswg.org/css-display/#box-generation">
+<link rel="author" href="mailto:ecobos@igalia.com" title="Emilio Cobos Álvarez">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<style>
+  .contents {
+    display: contents;
+  }
+
+  .contents-then-block {
+    display: contents;
+    display: block;
+  }
+
+  .content {
+    display: content;
+  }
+</style>
+<div class="contents" id="contentsElement"></div>
+<div class="content" id="bogusContentsElement"></div>
+<div class="contents-then-block" id="contentsThenBlockElement"></div>
+<script>
+test(function() {
+  var contentsElement = document.getElementById("contentsElement");
+  var bogusContentsElement = document.getElementById("bogusContentsElement");
+  var contentsThenBlockElement = document.getElementById("contentsThenBlockElement");
+
+  assert_equals(getComputedStyle(contentsElement).getPropertyValue("display"), "contents");
+  assert_equals(getComputedStyle(bogusContentsElement).getPropertyValue("display"), "block");
+  assert_equals(getComputedStyle(contentsThenBlockElement).getPropertyValue("display"), "block");
+
+  var element = document.createElement("div");
+  document.body.appendChild(element);
+  assert_equals(getComputedStyle(element).getPropertyValue("display"), "block");
+  element.style.display = "contents";
+  assert_equals(getComputedStyle(element).getPropertyValue("display"), "contents");
+  element.style.display = "block";
+  assert_equals(getComputedStyle(element).getPropertyValue("display"), "block");
+});
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-svg-anchor-child.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-svg-anchor-child.html
new file mode 100644
index 00000000000..8ff09dceb91
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-svg-anchor-child.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Display: display:contents on SVG anchor child</title>
+<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-display/#unbox-svg">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<svg>
+  <a>
+    <tspan style="display:contents;color:green">Text</tspan>
+  </a>
+  <text>
+    <a>
+      <tspan style="display:contents;color:green">Text</tspan>
+    </a>
+  </text>
+</svg>
+<script>
+  test(() => {}, "Loading this page should not cause a crash.");
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-svg-switch-child.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-svg-switch-child.html
new file mode 100644
index 00000000000..77808dac3bb
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-contents-svg-switch-child.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Display: display:contents on SVG switch child</title>
+<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-display/#unbox-svg">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<svg>
+  <switch>
+    <tspan style="display:contents;color:green">Text</tspan>
+  </switch>
+</svg>
+<script>
+  test(() => {}, "Loading this page should not cause a crash.");
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-first-line-001.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-first-line-001.html
new file mode 100644
index 00000000000..02297c8ffde
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-first-line-001.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Display: first-line and first-letter pseudo-elements</title>
+<link rel="help" href="https://www.w3.org/TR/css-display-3/#placement">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<style>
+  #t1::first-letter { float: left; display: flex; font-size: 30px }
+  #t2::first-letter { float: left; font-size: 30px }
+  #t3::first-letter { display: flex; font-size: 30px }
+  #t4::first-letter { font-size: 30px }
+  #t5::first-line { float: left; display: flex; font-size: 30px }
+  #t6::first-line { float: left; font-size: 30px }
+  #t7::first-line { display: flex; font-size: 30px }
+  #t8::first-line { font-size: 30px }
+</style>
+<div id="t1">First letter is float and flex.</div>
+<div id="t2">First letter is float but not flex.</div>
+<div id="t3">First letter is flex but not float.</div>
+<div id="t4">First letter not float or flex.</div>
+<div id="t5">First line is float and flex.</div>
+<div id="t6">First line is float but not flex.</div>
+<div id="t7">First line is flex but not float.</div>
+<div id="t8">First line is not float or flex.</div>
+<script>
+  function getFirstLetterDisplayFor(id) {
+    return window.getComputedStyle(document.getElementById(id), "::first-letter").display;
+  }
+  function getFirstLineDisplayFor(id) {
+    return window.getComputedStyle(document.getElementById(id), "::first-line").display;
+  }
+  test(function() {
+    assert_equals(getFirstLetterDisplayFor("t1"), "block");
+    assert_equals(getFirstLetterDisplayFor("t2"), "block");
+    assert_equals(getFirstLetterDisplayFor("t3"), "inline");
+    assert_equals(getFirstLetterDisplayFor("t4"), "inline");
+    assert_equals(getFirstLineDisplayFor("t5"), "inline");
+    assert_equals(getFirstLineDisplayFor("t6"), "inline");
+    assert_equals(getFirstLineDisplayFor("t7"), "inline");
+    assert_equals(getFirstLineDisplayFor("t8"), "inline");
+  }, "display of first-letter and first-line");
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-list-item-height-after-dom-change.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-list-item-height-after-dom-change.html
new file mode 100644
index 00000000000..c8fd9ff9e3b
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-list-item-height-after-dom-change.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Display: reflowing a display:list-item on dom changes - non-zero height</title>
+<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-display-3/#list-items">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<ul>
+  <li id="item" style="background:green">
+    <div id="content" style="overflow:hidden">Text<div>
+  </li>
+</ul>
+<script>
+  test(function() {
+    document.body.offsetTop; // force layout
+    item.insertBefore(document.createTextNode("This text should have a green background"), item.firstChild);
+    content.innerHTML = "";
+    assert_not_equals(item.clientHeight, 0, "The height of the LI should not be 0px.");
+  }, "List item height after DOM change.");
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-math-on-non-mathml-elements.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-math-on-non-mathml-elements.html
new file mode 100644
index 00000000000..3c7f7a52b93
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-math-on-non-mathml-elements.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>display: math display values on non-MathML compute to flow</title>
+<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+
+<div id="container">
+
+  <div data-expected="inline" style="display: math;"></div>
+  <div data-expected="inline" style="display: inline math;"></div>
+  <div data-expected="inline" style="display: math inline;"></div>
+  <div data-expected="block" style="display: block math;"></div>
+  <div data-expected="block" style="display: math block;"></div>
+
+  <svg data-expected="inline" style="display: math;"></svg>
+  <svg data-expected="inline" style="display: inline math;"></svg>
+  <svg data-expected="inline" style="display: math inline;"></svg>
+  <svg data-expected="block" style="display: block math;"></svg>
+  <svg data-expected="block" style="display: math block;"></svg>
+
+</div>
+
+<script>
+  Array.from(container.children).forEach(element => {
+      test(function() {
+          assert_equals(window.getComputedStyle(element).display,
+                        element.getAttribute('data-expected'));
+      }, `computed display on <${element.localName} style="${element.getAttribute('style')}">`);
+  });
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-math-on-pseudo-elements-001.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-math-on-pseudo-elements-001.html
new file mode 100644
index 00000000000..b1df0dd68f4
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-math-on-pseudo-elements-001.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>display: math and inline-math on pseudo elements compute to flow</title>
+<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<style>
+  .inline::before { content: 'math'; display: math; }
+  .inline::after { content: 'math'; display: math; }
+  .block::before { content: 'math'; display: block math; }
+  .block::after { content: 'math'; display: block math; }
+</style>
+<div>
+  <div class="block"></div>
+  <math class="block"></math>
+  <math><mrow class="block"></mrow></math>
+  <div class="inline"></div>
+  <math class="inline"></math>
+  <math><mrow class="inline"></mrow></math>
+</div>
+<script>
+  Array.from(document.querySelectorAll('[class]')).forEach(element => {
+      test(function() {
+          assert_equals(window.getComputedStyle(element, "::before").display,
+                        element.getAttribute('class'));
+          assert_equals(window.getComputedStyle(element, "::after").display,
+                        element.getAttribute('class'));
+      }, `computed display on ::before and ::after for <${element.localName} class="${element.className}">`);
+  });
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-with-float-dynamic.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-with-float-dynamic.html
new file mode 100644
index 00000000000..10844022a54
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-with-float-dynamic.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Computed float value of flex/grid items</title>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-containers">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
+<meta name="assert" content="computed float value of flex/grid items should be as specified">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+
+<div id="flex" style="display:flex;">
+  <div id="flex-item"></div>
+</div>
+<div id="grid" style="display:grid;">
+  <div id="grid-item">
+</div>
+<script>
+  function setFloatFor(id, float) {
+    document.getElementById(id).style.cssFloat = float;
+  }
+  function getFloatFor(id) {
+    return window.getComputedStyle(document.getElementById(id)).getPropertyValue("float");
+  }
+  function setDisplayBlock(id) {
+    document.getElementById(id).style.display = "block";
+  }
+  test(function() {
+    assert_equals(getFloatFor("flex-item"), "none");
+    assert_equals(getFloatFor("grid-item"), "none");
+
+    setFloatFor("flex-item", "left");
+    setFloatFor("grid-item", "right");
+    assert_equals(getFloatFor("flex-item"), "left");
+    assert_equals(getFloatFor("grid-item"), "right");
+
+    setDisplayBlock("grid");
+    setDisplayBlock("flex");
+    assert_equals(getFloatFor("flex-item"), "left");
+    assert_equals(getFloatFor("grid-item"), "right");
+  }, "computed style for float");
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-with-float.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-with-float.html
new file mode 100644
index 00000000000..2fc41279458
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/display-with-float.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Computed float value of flex/grid items</title>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-containers">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
+<meta name="assert" content="computed float value of flex/grid items should be as specified">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+
+<div style="display:flex;">
+  <div id="flex-item" style="float:left;"></div>
+</div>
+<div style="display:grid;">
+  <div id="grid-item" style="float:right;"></div>
+</div>
+<script>
+  function getFloatFor(id) {
+    return window.getComputedStyle(document.getElementById(id)).getPropertyValue("float");
+  }
+  test(function() {
+    assert_equals(getFloatFor("flex-item"), "left");
+    assert_equals(getFloatFor("grid-item"), "right");
+  }, "computed style for float");
+</script>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/inheritance.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/inheritance.html
new file mode 100644
index 00000000000..005d9c9e8b0
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/inheritance.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Inheritance of CSS display property</title>
+<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
+<meta name="assert" content="Property 'display' does not inherit.">
+<meta name="assert" content="Property 'display' has initial value 'inline'.">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<script src="../support/inheritance-testcommon.js"></script>
+</head>
+<body>
+<div id="container">
+<div id="target"></div>
+</div>
+<script>
+assert_not_inherited('display', 'inline', 'table');
+</script>
+</body>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-computed.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-computed.html
new file mode 100644
index 00000000000..53e71c4120e
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-computed.html
@@ -0,0 +1,193 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Display: getComputedStyle().display</title>
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#display-prop">
+<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
+<link rel="help" href="https://www.w3.org/TR/CSS2/visuren.html#dis-pos-flo">
+<meta name="assert" content="position and float can change display computed value.">
+<meta name="assert" content="display computed value is otherwise as specified.">
+<script src="../../../resources/testharness.js"></script>
+<script src="../../../resources/testharnessreport.js"></script>
+<script src="../../support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+'use strict';
+
+// https://drafts.csswg.org/css-grid-1/#grid-containers
+test_computed_value("display", "grid");
+test_computed_value("display", "inline-grid");
+
+// https://drafts.csswg.org/css2/visuren.html#display-prop
+test_computed_value("display", "inline");
+test_computed_value("display", "block");
+test_computed_value("display", "list-item");
+test_computed_value("display", "inline-block");
+test_computed_value("display", "table");
+test_computed_value("display", "inline-table");
+test_computed_value("display", "table-row-group");
+test_computed_value("display", "table-header-group");
+test_computed_value("display", "table-footer-group");
+test_computed_value("display", "table-row");
+test_computed_value("display", "table-column-group");
+test_computed_value("display", "table-column");
+test_computed_value("display", "table-cell");
+test_computed_value("display", "table-caption");
+test_computed_value("display", "none");
+
+// https://drafts.csswg.org/css-flexbox-1/#flex-containers
+test_computed_value("display", "flex");
+test_computed_value("display", "inline-flex");
+
+test_computed_value("display", "contents");
+
+test_computed_value("display", "run-in");
+test_computed_value("display", "flow", "block");
+test_computed_value("display", "flow-root");
+test_computed_value("display", "ruby");
+test_computed_value("display", "ruby-base");
+test_computed_value("display", "ruby-text");
+
+test_computed_value("display", "flow list-item", "list-item");
+test_computed_value("display", "list-item flow", "list-item");
+test_computed_value("display", "flow-root list-item", "flow-root list-item");
+test_computed_value("display", "list-item flow-root", "flow-root list-item");
+
+test_computed_value("display", "block flow", "block");
+test_computed_value("display", "flow block", "block");
+test_computed_value("display", "flow-root block", "flow-root");
+test_computed_value("display", "block flow-root", "flow-root");
+test_computed_value("display", "flex block", "flex");
+test_computed_value("display", "block flex", "flex");
+test_computed_value("display", "grid block", "grid");
+test_computed_value("display", "block grid", "grid");
+test_computed_value("display", "table block", "table");
+test_computed_value("display", "block table", "table");
+test_computed_value("display", "block ruby", "block ruby");
+test_computed_value("display", "ruby block", "block ruby");
+test_computed_value("display", "block list-item", "list-item");
+test_computed_value("display", "list-item block", "list-item");
+test_computed_value("display", "flow block list-item", "list-item");
+test_computed_value("display", "block flow list-item", "list-item");
+test_computed_value("display", "flow list-item block", "list-item");
+test_computed_value("display", "block list-item flow", "list-item");
+test_computed_value("display", "list-item block flow", "list-item");
+test_computed_value("display", "list-item flow block", "list-item");
+test_computed_value("display", "flow-root block list-item", "flow-root list-item");
+test_computed_value("display", "block flow-root list-item", "flow-root list-item");
+test_computed_value("display", "flow-root list-item block", "flow-root list-item");
+test_computed_value("display", "block list-item flow-root", "flow-root list-item");
+test_computed_value("display", "list-item block flow-root", "flow-root list-item");
+test_computed_value("display", "list-item flow-root block", "flow-root list-item");
+
+test_computed_value("display", "inline flow", "inline");
+test_computed_value("display", "flow inline", "inline");
+test_computed_value("display", "flow-root inline", "inline-block");
+test_computed_value("display", "inline flow-root", "inline-block");
+test_computed_value("display", "flex inline", "inline-flex");
+test_computed_value("display", "inline flex", "inline-flex");
+test_computed_value("display", "grid inline", "inline-grid");
+test_computed_value("display", "inline grid", "inline-grid");
+test_computed_value("display", "table inline", "inline-table");
+test_computed_value("display", "inline table", "inline-table");
+test_computed_value("display", "inline ruby", "ruby");
+test_computed_value("display", "ruby inline", "ruby");
+test_computed_value("display", "inline list-item", "inline list-item");
+test_computed_value("display", "list-item inline", "inline list-item");
+test_computed_value("display", "flow inline list-item", "inline list-item");
+test_computed_value("display", "inline flow list-item", "inline list-item");
+test_computed_value("display", "flow list-item inline", "inline list-item");
+test_computed_value("display", "inline list-item flow", "inline list-item");
+test_computed_value("display", "list-item inline flow", "inline list-item");
+test_computed_value("display", "list-item flow inline", "inline list-item");
+test_computed_value("display", "flow-root inline list-item", "inline flow-root list-item");
+test_computed_value("display", "inline flow-root list-item", "inline flow-root list-item");
+test_computed_value("display", "flow-root list-item inline", "inline flow-root list-item");
+test_computed_value("display", "inline list-item flow-root", "inline flow-root list-item");
+test_computed_value("display", "list-item inline flow-root", "inline flow-root list-item");
+test_computed_value("display", "list-item flow-root inline", "inline flow-root list-item");
+
+test_computed_value("display", "run-in flow", "run-in");
+test_computed_value("display", "flow run-in", "run-in");
+test_computed_value("display", "flow-root run-in", "run-in flow-root");
+test_computed_value("display", "run-in flow-root", "run-in flow-root");
+test_computed_value("display", "flex run-in", "run-in flex");
+test_computed_value("display", "run-in flex", "run-in flex");
+test_computed_value("display", "grid run-in", "run-in grid");
+test_computed_value("display", "run-in grid", "run-in grid");
+test_computed_value("display", "table run-in", "run-in table");
+test_computed_value("display", "run-in table", "run-in table");
+test_computed_value("display", "run-in ruby", "run-in ruby");
+test_computed_value("display", "ruby run-in", "run-in ruby");
+test_computed_value("display", "run-in list-item", "run-in list-item");
+test_computed_value("display", "list-item run-in", "run-in list-item");
+test_computed_value("display", "flow run-in list-item", "run-in list-item");
+test_computed_value("display", "run-in flow list-item", "run-in list-item");
+test_computed_value("display", "flow list-item run-in", "run-in list-item");
+test_computed_value("display", "run-in list-item flow", "run-in list-item");
+test_computed_value("display", "list-item run-in flow", "run-in list-item");
+test_computed_value("display", "list-item flow run-in", "run-in list-item");
+test_computed_value("display", "flow-root run-in list-item", "run-in flow-root list-item");
+test_computed_value("display", "run-in flow-root list-item", "run-in flow-root list-item");
+test_computed_value("display", "flow-root list-item run-in", "run-in flow-root list-item");
+test_computed_value("display", "run-in list-item flow-root", "run-in flow-root list-item");
+test_computed_value("display", "list-item run-in flow-root", "run-in flow-root list-item");
+test_computed_value("display", "list-item flow-root run-in", "run-in flow-root list-item");
+
+// https://www.w3.org/TR/CSS2/visuren.html#dis-pos-flo
+function test_display_affected(property, value) {
+  const target = document.getElementById('target');
+  test(() => {
+    target.style[property] = value;
+    target.style.display = 'inline-table';
+    assert_equals(getComputedStyle(target).display, 'table', 'inline-table -> block');
+
+    const displayValues = [
+      'inline',
+      'table-row-group',
+      'table-column',
+      'table-column-group',
+      'table-header-group',
+      'table-footer-group',
+      'table-row',
+      'table-cell',
+      'table-caption',
+      'ruby-base',
+      'ruby-text',
+      'inline-block'
+    ];
+
+    for (let displayValue of displayValues) {
+      target.style.display = displayValue;
+      assert_equals(getComputedStyle(target).display, 'block', displayValue + ' -> block');
+    }
+
+    target.style.display = 'inline-flex';
+    assert_equals(getComputedStyle(target).display, 'flex', 'inline-flex -> flex');
+
+    target.style.display = 'inline-grid';
+    assert_equals(getComputedStyle(target).display, 'grid', 'inline-grid -> grid');
+
+    // Other values are not affected.
+    target.style.display = 'list-item';
+    assert_equals(getComputedStyle(target).display, 'list-item', 'list-item -> list-item');
+
+    target.style.display = 'contents';
+    assert_equals(getComputedStyle(target).display, 'contents', 'contents -> contents');
+
+    target.style[property] = '';
+    target.style.display = '';
+  }, property + ' ' + value + ' affects computed display');
+}
+
+test_display_affected("position", "absolute");
+test_display_affected("position", "fixed");
+test_display_affected("float", "left");
+test_display_affected("float", "right");
+</script>
+</body>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-invalid.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-invalid.html
new file mode 100644
index 00000000000..243bcf4189f
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-invalid.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Display: parsing display with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#display-prop">
+<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
+<meta name="assert" content="display supports only the spec grammar.">
+<script src="../../../resources/testharness.js"></script>
+<script src="../../../resources/testharnessreport.js"></script>
+<script src="../../support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("display", "grid inline-grid");
+test_invalid_value("display", "none grid");
+test_invalid_value("display", "none flow");
+test_invalid_value("display", "none ruby");
+test_invalid_value("display", "none flow-root");
+test_invalid_value("display", "none list-item");
+test_invalid_value("display", "contents list-item");
+test_invalid_value("display", "list-item contents");
+test_invalid_value("display", "flow flow");
+test_invalid_value("display", "block block");
+test_invalid_value("display", "flow flow-root");
+test_invalid_value("display", "flow-root flow-root");
+test_invalid_value("display", "block inline");
+test_invalid_value("display", "flex ruby");
+test_invalid_value("display", "ruby flex");
+test_invalid_value("display", "inline inline");
+test_invalid_value("display", "flex flex");
+test_invalid_value("display", "grid flex");
+test_invalid_value("display", "ruby grid");
+test_invalid_value("display", "flex grid");
+test_invalid_value("display", "grid table");
+test_invalid_value("display", "table flex");
+test_invalid_value("display", "flex table");
+test_invalid_value("display", "ruby table");
+test_invalid_value("display", "table table");
+test_invalid_value("display", "table flow-root");
+test_invalid_value("display", "flow-root ruby");
+test_invalid_value("display", "list-item list-item");
+test_invalid_value("display", "list-item table");
+test_invalid_value("display", "flex list-item");
+test_invalid_value("display", "list-item grid");
+test_invalid_value("display", "flow flow list-item");
+test_invalid_value("display", "grid flow list-item");
+test_invalid_value("display", "flow list-item flow");
+test_invalid_value("display", "block list-item block");
+test_invalid_value("display", "list-item flow-root flow");
+test_invalid_value("display", "list-item block block");
+test_invalid_value("display", "list-item block list-item");
+test_invalid_value("display", "list-item flow-root list-item");
+test_invalid_value("display", "list-item flow-root block list-item");
+test_invalid_value("display", "list-item block flow-root list-item");
+test_invalid_value("display", "block list-item flow-root list-item");
+test_invalid_value("display", "flow-root list-item block list-item");
+test_invalid_value("display", "list-item ruby");
+test_invalid_value("display", "ruby list-item");
+test_invalid_value("display", "ruby ruby");
+test_invalid_value("display", "ruby flow");
+test_invalid_value("display", "flow ruby");
+test_invalid_value("display", "ruby flow-root");
+test_invalid_value("display", "grid ruby");
+test_invalid_value("display", "table ruby");
+test_invalid_value("display", "table-row flow");
+test_invalid_value("display", "flow table-row");
+test_invalid_value("display", "table-row-group flow-root");
+test_invalid_value("display", "flex table-row-group");
+
+</script>
+</body>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-valid.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-valid.html
new file mode 100644
index 00000000000..d4d2b1a3733
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/parsing/display-valid.html
@@ -0,0 +1,141 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Display: parsing display with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#display-prop">
+<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
+<meta name="assert" content="display supports the full spec grammar.">
+<meta name="assert" content="display supports the new values 'grid | inline-grid'.">
+<script src="../../../resources/testharness.js"></script>
+<script src="../../../resources/testharnessreport.js"></script>
+<script src="../../support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// https://drafts.csswg.org/css-grid-1/#grid-containers
+test_valid_value("display", "grid");
+test_valid_value("display", "inline-grid");
+
+// https://drafts.csswg.org/css2/visuren.html#display-prop
+test_valid_value("display", "inline");
+test_valid_value("display", "block");
+test_valid_value("display", "list-item");
+test_valid_value("display", "inline-block");
+test_valid_value("display", "table");
+test_valid_value("display", "inline-table");
+test_valid_value("display", "table-row-group");
+test_valid_value("display", "table-header-group");
+test_valid_value("display", "table-footer-group");
+test_valid_value("display", "table-row");
+test_valid_value("display", "table-column-group");
+test_valid_value("display", "table-column");
+test_valid_value("display", "table-cell");
+test_valid_value("display", "table-caption");
+test_valid_value("display", "none");
+
+// https://drafts.csswg.org/css-flexbox-1/#flex-containers
+test_valid_value("display", "flex");
+test_valid_value("display", "inline-flex");
+
+test_valid_value("display", "contents");
+
+// https://drafts.csswg.org/css-display/#the-display-properties
+test_valid_value("display", "run-in");
+test_valid_value("display", "flow", "block");
+test_valid_value("display", "flow-root");
+test_valid_value("display", "ruby");
+test_valid_value("display", "ruby-base");
+test_valid_value("display", "ruby-text");
+
+test_valid_value("display", "flow list-item", "list-item");
+test_valid_value("display", "list-item flow", "list-item");
+test_valid_value("display", "flow-root list-item", "flow-root list-item");
+test_valid_value("display", "list-item flow-root", "flow-root list-item");
+
+test_valid_value("display", "block flow", "block");
+test_valid_value("display", "flow block", "block");
+test_valid_value("display", "flow-root block", "flow-root");
+test_valid_value("display", "block flow-root", "flow-root");
+test_valid_value("display", "flex block", "flex");
+test_valid_value("display", "block flex", "flex");
+test_valid_value("display", "grid block", "grid");
+test_valid_value("display", "block grid", "grid");
+test_valid_value("display", "table block", "table");
+test_valid_value("display", "block table", "table");
+test_valid_value("display", "block ruby", "block ruby");
+test_valid_value("display", "ruby block", "block ruby");
+test_valid_value("display", "block list-item", "list-item");
+test_valid_value("display", "list-item block", "list-item");
+test_valid_value("display", "flow block list-item", "list-item");
+test_valid_value("display", "block flow list-item", "list-item");
+test_valid_value("display", "flow list-item block", "list-item");
+test_valid_value("display", "block list-item flow", "list-item");
+test_valid_value("display", "list-item block flow", "list-item");
+test_valid_value("display", "list-item flow block", "list-item");
+test_valid_value("display", "flow-root block list-item", "flow-root list-item");
+test_valid_value("display", "block flow-root list-item", "flow-root list-item");
+test_valid_value("display", "flow-root list-item block", "flow-root list-item");
+test_valid_value("display", "block list-item flow-root", "flow-root list-item");
+test_valid_value("display", "list-item block flow-root", "flow-root list-item");
+test_valid_value("display", "list-item flow-root block", "flow-root list-item");
+
+test_valid_value("display", "inline flow", "inline");
+test_valid_value("display", "flow inline", "inline");
+test_valid_value("display", "flow-root inline", "inline-block");
+test_valid_value("display", "inline flow-root", "inline-block");
+test_valid_value("display", "flex inline", "inline-flex");
+test_valid_value("display", "inline flex", "inline-flex");
+test_valid_value("display", "grid inline", "inline-grid");
+test_valid_value("display", "inline grid", "inline-grid");
+test_valid_value("display", "table inline", "inline-table");
+test_valid_value("display", "inline table", "inline-table");
+test_valid_value("display", "inline ruby", "ruby");
+test_valid_value("display", "ruby inline", "ruby");
+test_valid_value("display", "inline list-item", "inline list-item");
+test_valid_value("display", "list-item inline", "inline list-item");
+test_valid_value("display", "flow inline list-item", "inline list-item");
+test_valid_value("display", "inline flow list-item", "inline list-item");
+test_valid_value("display", "flow list-item inline", "inline list-item");
+test_valid_value("display", "inline list-item flow", "inline list-item");
+test_valid_value("display", "list-item inline flow", "inline list-item");
+test_valid_value("display", "list-item flow inline", "inline list-item");
+test_valid_value("display", "flow-root inline list-item", "inline flow-root list-item");
+test_valid_value("display", "inline flow-root list-item", "inline flow-root list-item");
+test_valid_value("display", "flow-root list-item inline", "inline flow-root list-item");
+test_valid_value("display", "inline list-item flow-root", "inline flow-root list-item");
+test_valid_value("display", "list-item inline flow-root", "inline flow-root list-item");
+test_valid_value("display", "list-item flow-root inline", "inline flow-root list-item");
+
+test_valid_value("display", "run-in flow", "run-in");
+test_valid_value("display", "flow run-in", "run-in");
+test_valid_value("display", "flow-root run-in", "run-in flow-root");
+test_valid_value("display", "run-in flow-root", "run-in flow-root");
+test_valid_value("display", "flex run-in", "run-in flex");
+test_valid_value("display", "run-in flex", "run-in flex");
+test_valid_value("display", "grid run-in", "run-in grid");
+test_valid_value("display", "run-in grid", "run-in grid");
+test_valid_value("display", "table run-in", "run-in table");
+test_valid_value("display", "run-in table", "run-in table");
+test_valid_value("display", "run-in ruby", "run-in ruby");
+test_valid_value("display", "ruby run-in", "run-in ruby");
+test_valid_value("display", "run-in list-item", "run-in list-item");
+test_valid_value("display", "list-item run-in", "run-in list-item");
+test_valid_value("display", "flow run-in list-item", "run-in list-item");
+test_valid_value("display", "run-in flow list-item", "run-in list-item");
+test_valid_value("display", "flow list-item run-in", "run-in list-item");
+test_valid_value("display", "run-in list-item flow", "run-in list-item");
+test_valid_value("display", "list-item run-in flow", "run-in list-item");
+test_valid_value("display", "list-item flow run-in", "run-in list-item");
+test_valid_value("display", "flow-root run-in list-item", "run-in flow-root list-item");
+test_valid_value("display", "run-in flow-root list-item", "run-in flow-root list-item");
+test_valid_value("display", "flow-root list-item run-in", "run-in flow-root list-item");
+test_valid_value("display", "run-in list-item flow-root", "run-in flow-root list-item");
+test_valid_value("display", "list-item run-in flow-root", "run-in flow-root list-item");
+test_valid_value("display", "list-item flow-root run-in", "run-in flow-root list-item");
+
+</script>
+</body>
+</html>
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-display/textarea-display.html b/Tests/LibWeb/Text/input/wpt-import/css/css-display/textarea-display.html
new file mode 100644
index 00000000000..175f797104f
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-display/textarea-display.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Display of textarea</title>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1700535">
+<link rel="help" href="https://github.com/whatwg/html/issues/4082">
+<meta name="assert" content="textarea has inline block display.">
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+</head>
+<body>
+<textarea id="t"></textarea>
+<script>
+    test(
+      function(){
+        var target = document.getElementById("t");
+        assert_equals(getComputedStyle(target).display, "inline-block");
+      }, "textarea has inline block display");
+</script>
+</body>
+</html>