Attachment 423869 Details for Bug 223569 – Patch

[patch] Patch

bug-223569-20210322120246.patch (text/plain), 126.58 KB, created by Rob Buis on 2021-03-22 04:02:48 PDT

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Creator: Rob Buis

Created: 2021-03-22 04:02:48 PDT

Size: 126.58 KB

patch

obsolete

>Subversion Revision: 274750
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index a7e6775521d07ff9ad9aa0d3f2711d2a620760c0..cc7fa203a83f2c6d5c6d2eb8c5ddc5b818cf52ed 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,12 @@
>+2021-03-22  Rob Buis  <rbuis@igalia.com>
>+
>+        Support contain: layout
>+        https://bugs.webkit.org/show_bug.cgi?id=223569
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Scripts/Preferences/WebPreferencesExperimental.yaml:
>+
> 2021-03-19  Sam Weinig  <weinig@apple.com>
> 
>         Add PropertyName parameter to custom setters to allow shared implementations to do late name lookup
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index ad92269981d79d2b1ff7028fde28a00e7c4437f2..818097bc341e64b96f707ea7a7de31fe07e9bbd3 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,59 @@
>+2021-03-22  Rob Buis  <rbuis@igalia.com>
>+
>+        Support contain: layout
>+        https://bugs.webkit.org/show_bug.cgi?id=223569
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Test: fast/css/contain-invalidate-if-disabled.html
>+
>+        * css/CSSComputedStyleDeclaration.cpp:
>+        (WebCore::ComputedStyleExtractor::valueForPropertyInStyle):
>+        * css/CSSProperties.json:
>+        * css/CSSValueKeywords.in:
>+        * css/parser/CSSParserContext.cpp:
>+        (WebCore::operator==):
>+        (WebCore::CSSParserContext::isPropertyRuntimeDisabled const):
>+        * css/parser/CSSParserContext.h:
>+        (WebCore::CSSParserContextHash::hash):
>+        * css/parser/CSSPropertyParser.cpp:
>+        (WebCore::consumeContain):
>+        (WebCore::CSSPropertyParser::parseSingleValue):
>+        * rendering/RenderBlockFlow.cpp:
>+        (WebCore::RenderBlockFlow::firstLineBaseline const):
>+        * rendering/RenderBox.cpp:
>+        (WebCore::RenderBox::createsNewFormattingContext const):
>+        * rendering/RenderBox.h:
>+        * rendering/RenderElement.h:
>+        (WebCore::RenderElement::canContainFixedPositionObjects const):
>+        (WebCore::RenderElement::canContainAbsolutelyPositionedObjects const):
>+        * rendering/RenderFlexibleBox.cpp:
>+        (WebCore::RenderFlexibleBox::firstLineBaseline const):
>+        * rendering/RenderGrid.cpp:
>+        (WebCore::RenderGrid::firstLineBaseline const):
>+        * rendering/RenderLayer.cpp:
>+        (WebCore::RenderLayer::shouldBeCSSStackingContext const):
>+        * rendering/RenderObject.cpp:
>+        (WebCore::objectIsRelayoutBoundary):
>+        * rendering/RenderObject.h:
>+        (WebCore::RenderObject::shouldApplyLayoutContainment const):
>+        * rendering/style/RenderStyle.h:
>+        (WebCore::RenderStyle::contain const):
>+        (WebCore::RenderStyle::containsLayout const):
>+        (WebCore::RenderStyle::setContain):
>+        (WebCore::RenderStyle::initialContainment):
>+        (WebCore::RenderStyle::strictContainment):
>+        (WebCore::RenderStyle::contentContainment):
>+        * rendering/style/RenderStyleConstants.h:
>+        * rendering/style/StyleRareNonInheritedData.cpp:
>+        (WebCore::StyleRareNonInheritedData::StyleRareNonInheritedData):
>+        (WebCore::StyleRareNonInheritedData::operator== const):
>+        * rendering/style/StyleRareNonInheritedData.h:
>+        * style/StyleBuilderCustom.h:
>+        (WebCore::Style::BuilderCustom::applyInitialContain):
>+        (WebCore::Style::BuilderCustom::applyInheritContain):
>+        (WebCore::Style::BuilderCustom::applyValueContain):
>+
> 2021-03-19  Dean Jackson  <dino@apple.com>
> 
>         Link against the ANGLE Shared Library
>diff --git a/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml b/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
>index 89bc8fbd0fdeb9483349222abb213041cf9167d1..ecab6362e00a8c038536174a9330f15e2e7e95b9 100644
>--- a/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
>+++ b/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
>@@ -149,6 +149,18 @@ CSSColorMixEnabled:
>     WebCore:
>       default: false
> 
>+CSSContainmentEnabled:
>+  type: bool
>+  humanReadableName: "CSS Containment"
>+  humanReadableDescription: "Enable contain CSS property"
>+  defaultValue:
>+    WebKitLegacy:
>+      default: false
>+    WebKit:
>+      default: false
>+    WebCore:
>+      default: false
>+
> CSSCustomPropertiesAndValuesEnabled:
>   type: bool
>   humanReadableName: "CSS Custom Properties and Values API"
>diff --git a/Source/WebCore/css/CSSComputedStyleDeclaration.cpp b/Source/WebCore/css/CSSComputedStyleDeclaration.cpp
>index 2fac8eb81feba603b0b0cdd64907f0c8346e5860..6ddb6cb0c8ec6ac5f33837d2efc7cd6f1380175a 100644
>--- a/Source/WebCore/css/CSSComputedStyleDeclaration.cpp
>+++ b/Source/WebCore/css/CSSComputedStyleDeclaration.cpp
>@@ -3482,6 +3482,27 @@ RefPtr<CSSValue> ComputedStyleExtractor::valueForPropertyInStyle(const RenderSty
>             }
>             ASSERT_NOT_REACHED();
>             return nullptr;
>+        case CSSPropertyContain: {
>+            if (renderer && !renderer->settings().cssContainmentEnabled())
>+                return nullptr;
>+            auto containment = style.contain();
>+            if (!containment)
>+                return cssValuePool.createIdentifierValue(CSSValueNone);
>+            if (containment == RenderStyle::strictContainment())
>+                return cssValuePool.createIdentifierValue(CSSValueStrict);
>+            if (containment == RenderStyle::contentContainment())
>+                return cssValuePool.createIdentifierValue(CSSValueContent);
>+            auto list = CSSValueList::createSpaceSeparated();
>+            if (containment & Containment::Size)
>+                list->append(cssValuePool.createIdentifierValue(CSSValueSize));
>+            if (containment & Containment::Layout)
>+                list->append(cssValuePool.createIdentifierValue(CSSValueLayout));
>+            if (containment & Containment::Style)
>+                list->append(cssValuePool.createIdentifierValue(CSSValueStyle));
>+            if (containment & Containment::Paint)
>+                list->append(cssValuePool.createIdentifierValue(CSSValuePaint));
>+            return list;
>+        }
>         case CSSPropertyWebkitBackfaceVisibility:
>             return cssValuePool.createIdentifierValue((style.backfaceVisibility() == BackfaceVisibility::Hidden) ? CSSValueHidden : CSSValueVisible);
>         case CSSPropertyWebkitBorderImage:
>diff --git a/Source/WebCore/css/CSSProperties.json b/Source/WebCore/css/CSSProperties.json
>index 5c63a7a04c9d1c6f156fc7ae95a1591fca9474d4..a33ffcbc848ae1371ae53e687e51c460fd265e59 100644
>--- a/Source/WebCore/css/CSSProperties.json
>+++ b/Source/WebCore/css/CSSProperties.json
>@@ -4567,6 +4567,19 @@
>                 "url": "https://drafts.csswg.org/css-sizing-4/#aspect-ratio"
>             }
>         },
>+        "contain": {
>+            "codegen-properties": {
>+                "custom": "All",
>+                "settings-flag": "cssContainment"
>+            },
>+            "status": {
>+                "status": "experimental"
>+            },
>+            "specification": {
>+                "category": "css-contain",
>+                "url": "https://drafts.csswg.org/css-contain-1/"
>+            }
>+        },
>         "-webkit-backface-visibility": {
>             "values": [
>                 "visible",
>diff --git a/Source/WebCore/css/CSSValueKeywords.in b/Source/WebCore/css/CSSValueKeywords.in
>index a17d2a5b39f035492f0668ad6e995f94a708fa41..7ac2762840291ab93b8f12d6c8e1b2e66a9206d2 100644
>--- a/Source/WebCore/css/CSSValueKeywords.in
>+++ b/Source/WebCore/css/CSSValueKeywords.in
>@@ -1516,3 +1516,14 @@ compact
> x
> y
> z
>+
>+// contain
>+// none
>+// strict
>+// content
>+size
>+layout
>+// style
>+#if !(defined(ENABLE_CSS_PAINTING_API) && ENABLE_CSS_PAINTING_API)
>+paint
>+#endif
>diff --git a/Source/WebCore/css/parser/CSSParserContext.cpp b/Source/WebCore/css/parser/CSSParserContext.cpp
>index 41c397f42d072fffc3c722e125f2c0b6597b8e91..e7825dc2228908820c7cb9aa1b4bbde9a2671485 100644
>--- a/Source/WebCore/css/parser/CSSParserContext.cpp
>+++ b/Source/WebCore/css/parser/CSSParserContext.cpp
>@@ -72,6 +72,7 @@ CSSParserContext::CSSParserContext(const Document& document, const URL& sheetBas
>     , colorFilterEnabled { document.settings().colorFilterEnabled() }
>     , colorMixEnabled { document.settings().cssColorMixEnabled() }
>     , constantPropertiesEnabled { document.settings().constantPropertiesEnabled() }
>+    , containmentEnabled { document.settings().cssContainmentEnabled() }
>     , cssColor4 { document.settings().cssColor4() }
>     , deferredCSSParserEnabled { document.settings().deferredCSSParserEnabled() }
>     , individualTransformPropertiesEnabled { document.settings().cssIndividualTransformPropertiesEnabled() }
>@@ -111,6 +112,7 @@ bool operator==(const CSSParserContext& a, const CSSParserContext& b)
>         && a.colorFilterEnabled == b.colorFilterEnabled
>         && a.colorMixEnabled == b.colorMixEnabled
>         && a.constantPropertiesEnabled == b.constantPropertiesEnabled
>+        && a.containmentEnabled == b.containmentEnabled
>         && a.cssColor4 == b.cssColor4
>         && a.deferredCSSParserEnabled == b.deferredCSSParserEnabled
>         && a.individualTransformPropertiesEnabled == b.individualTransformPropertiesEnabled
>@@ -140,6 +142,8 @@ bool CSSParserContext::isPropertyRuntimeDisabled(CSSPropertyID property) const
>     switch (property) {
>     case CSSPropertyAspectRatio:
>         return !aspectRatioEnabled;
>+    case CSSPropertyContain:
>+        return !containmentEnabled;
>     case CSSPropertyAppleColorFilter:
>         return !colorFilterEnabled;
>     case CSSPropertyTranslate:
>diff --git a/Source/WebCore/css/parser/CSSParserContext.h b/Source/WebCore/css/parser/CSSParserContext.h
>index 3c65272779b51754494d8d9e33046ac7fa444c9d..8e0b87f7aa760e6ef276bd632effb0afad91e6e6 100644
>--- a/Source/WebCore/css/parser/CSSParserContext.h
>+++ b/Source/WebCore/css/parser/CSSParserContext.h
>@@ -65,6 +65,7 @@ public:
>     bool colorFilterEnabled { false };
>     bool colorMixEnabled { false };
>     bool constantPropertiesEnabled { false };
>+    bool containmentEnabled { false };
>     bool cssColor4 { false };
>     bool deferredCSSParserEnabled { false };
>     bool individualTransformPropertiesEnabled { false };
>@@ -117,28 +118,29 @@ struct CSSParserContextHash {
>             & key.colorFilterEnabled                        << 6
>             & key.colorMixEnabled                           << 7
>             & key.constantPropertiesEnabled                 << 8
>-            & key.cssColor4                                 << 9
>-            & key.deferredCSSParserEnabled                  << 10
>-            & key.individualTransformPropertiesEnabled      << 11
>+            & key.containmentEnabled                        << 9
>+            & key.cssColor4                                 << 10
>+            & key.deferredCSSParserEnabled                  << 11
>+            & key.individualTransformPropertiesEnabled      << 12
> #if ENABLE(OVERFLOW_SCROLLING_TOUCH)
>-            & key.legacyOverflowScrollingTouchEnabled       << 12
>+            & key.legacyOverflowScrollingTouchEnabled       << 13
> #endif
>-            & key.overscrollBehaviorEnabled                 << 13
>-            & key.relativeColorSyntaxEnabled                << 14
>-            & key.scrollBehaviorEnabled                     << 15
>-            & key.springTimingFunctionEnabled               << 16
>+            & key.overscrollBehaviorEnabled                 << 14
>+            & key.relativeColorSyntaxEnabled                << 15
>+            & key.scrollBehaviorEnabled                     << 16
>+            & key.springTimingFunctionEnabled               << 17
> #if ENABLE(TEXT_AUTOSIZING)
>-            & key.textAutosizingEnabled                     << 17
>+            & key.textAutosizingEnabled                     << 18
> #endif
> #if ENABLE(CSS_TRANSFORM_STYLE_OPTIMIZED_3D)
>-            & key.transformStyleOptimized3DEnabled          << 18
>+            & key.transformStyleOptimized3DEnabled          << 19
> #endif
>-            & key.useLegacyBackgroundSizeShorthandBehavior  << 19
>-            & key.focusVisibleEnabled                       << 20
>+            & key.useLegacyBackgroundSizeShorthandBehavior  << 20
>+            & key.focusVisibleEnabled                       << 21
> #if ENABLE(ATTACHMENT_ELEMENT)
>-            & key.attachmentEnabled                         << 21
>+            & key.attachmentEnabled                         << 22
> #endif
>-            & key.mode                                      << 22; // Keep this last.
>+            & key.mode                                      << 23; // Keep this last.
>         hash ^= WTF::intHash(bits);
>         return hash;
>     }
>diff --git a/Source/WebCore/css/parser/CSSPropertyParser.cpp b/Source/WebCore/css/parser/CSSPropertyParser.cpp
>index 397942a29587baaee0e5b680979cac1660b7c82f..6ea3c7d38f1b6d5c73765923182d5292cdb247c8 100644
>--- a/Source/WebCore/css/parser/CSSPropertyParser.cpp
>+++ b/Source/WebCore/css/parser/CSSPropertyParser.cpp
>@@ -3924,6 +3924,41 @@ static RefPtr<CSSValue> consumeAspectRatio(CSSParserTokenRange& range)
>     return RefPtr<CSSValue>(WTFMove(list));
> }
> 
>+static RefPtr<CSSValue> consumeContain(CSSParserTokenRange& range)
>+{
>+    RefPtr<CSSPrimitiveValue> singleValue;
>+    if (range.peek().type() == IdentToken)
>+        singleValue = consumeIdent<CSSValueNone, CSSValueStrict, CSSValueContent>(range);
>+    if (singleValue)
>+        return singleValue;
>+    auto list = CSSValueList::createSpaceSeparated();
>+    RefPtr<CSSPrimitiveValue> size, layout, style, paint;
>+    while (true) {
>+        auto id = range.peek().id();
>+        if (id == CSSValueSize && !size)
>+            size = consumeIdent(range);
>+        else if (id == CSSValueLayout && !layout)
>+            layout = consumeIdent(range);
>+        else if (id == CSSValueStyle && !style)
>+            style = consumeIdent(range);
>+        else if (id == CSSValuePaint && !paint)
>+            paint = consumeIdent(range);
>+        else
>+            break;
>+    }
>+    if (size)
>+        list->append(size.releaseNonNull());
>+    if (layout)
>+        list->append(layout.releaseNonNull());
>+    if (style)
>+        list->append(style.releaseNonNull());
>+    if (paint)
>+        list->append(paint.releaseNonNull());
>+    if (!list->length())
>+        return nullptr;
>+    return RefPtr<CSSValue>(WTFMove(list));
>+}
>+
> static RefPtr<CSSValue> consumeTextEmphasisPosition(CSSParserTokenRange& range)
> {
>     bool foundOverOrUnder = false;
>@@ -4499,6 +4534,10 @@ RefPtr<CSSValue> CSSPropertyParser::parseSingleValue(CSSPropertyID property, CSS
>         if (!m_context.aspectRatioEnabled)
>             return nullptr;
>         return consumeAspectRatio(m_range);
>+    case CSSPropertyContain:
>+        if (!m_context.containmentEnabled)
>+            return nullptr;
>+        return consumeContain(m_range);
>     case CSSPropertyWebkitTextEmphasisPosition:
>         return consumeTextEmphasisPosition(m_range);
> #if ENABLE(DARK_MODE_CSS)
>diff --git a/Source/WebCore/rendering/RenderBlockFlow.cpp b/Source/WebCore/rendering/RenderBlockFlow.cpp
>index 4d424343aa63bc4e56d7ecc992e0ca17d8abfc04..2c024fe8d69693105d90be1e44b506047b4b6290 100644
>--- a/Source/WebCore/rendering/RenderBlockFlow.cpp
>+++ b/Source/WebCore/rendering/RenderBlockFlow.cpp
>@@ -3114,6 +3114,9 @@ Optional<int> RenderBlockFlow::firstLineBaseline() const
>     if (!childrenInline())
>         return RenderBlock::firstLineBaseline();
> 
>+    if (shouldApplyLayoutContainment())
>+        return WTF::nullopt;
>+
>     if (!hasLines())
>         return WTF::nullopt;
> 
>diff --git a/Source/WebCore/rendering/RenderBox.cpp b/Source/WebCore/rendering/RenderBox.cpp
>index 32bb6c31829b265f23c2f9918564b34e448fcc5f..963638eb85773c8d8ce62372b5cc4e41b8b700fd 100644
>--- a/Source/WebCore/rendering/RenderBox.cpp
>+++ b/Source/WebCore/rendering/RenderBox.cpp
>@@ -4678,6 +4678,7 @@ bool RenderBox::createsNewFormattingContext() const
> {
>     return isInlineBlockOrInlineTable() || isFloatingOrOutOfFlowPositioned() || hasOverflowClip() || isFlexItemIncludingDeprecated()
>         || isTableCell() || isTableCaption() || isFieldset() || isWritingModeRoot() || isDocumentElementRenderer() || isRenderFragmentedFlow() || isRenderFragmentContainer()
>+        || shouldApplyLayoutContainment()
>         || isGridItem() || style().specifiesColumns() || style().columnSpan() == ColumnSpan::All || style().display() == DisplayType::FlowRoot;
> }
> 
>diff --git a/Source/WebCore/rendering/RenderBox.h b/Source/WebCore/rendering/RenderBox.h
>index c5a8d8fc957dde39062c03ea1faf7c6dcacce512..62ec9428e9b70bc5c7ce8fbc6f31ccc6e41db84e 100644
>--- a/Source/WebCore/rendering/RenderBox.h
>+++ b/Source/WebCore/rendering/RenderBox.h
>@@ -54,6 +54,7 @@ public:
>     {
>         return isDocumentElementRenderer() || isPositioned() || createsGroup() || hasOverflowClip()
>             || hasTransformRelatedProperty() || hasHiddenBackface() || hasReflection() || style().specifiesColumns()
>+            || style().containsLayout()
>             || !style().hasAutoUsedZIndex() || hasRunningAcceleratedAnimations();
>     }
> 
>diff --git a/Source/WebCore/rendering/RenderElement.h b/Source/WebCore/rendering/RenderElement.h
>index 232928cdb7f094dab407f03a84322a846ec1cf7c..997c2463f86b5016f4d32e233b1f816263017369 100644
>--- a/Source/WebCore/rendering/RenderElement.h
>+++ b/Source/WebCore/rendering/RenderElement.h
>@@ -427,6 +427,7 @@ inline bool RenderElement::canContainFixedPositionObjects() const
>     return isRenderView()
>         || (hasTransform() && isRenderBlock())
>         || isSVGForeignObject()
>+        || shouldApplyLayoutContainment()
>         || isOutOfFlowRenderFragmentedFlow();
> }
> 
>@@ -435,6 +436,7 @@ inline bool RenderElement::canContainAbsolutelyPositionedObjects() const
>     return style().position() != PositionType::Static
>         || (isRenderBlock() && hasTransformRelatedProperty())
>         || isSVGForeignObject()
>+        || shouldApplyLayoutContainment()
>         || isRenderView();
> }
> 
>diff --git a/Source/WebCore/rendering/RenderFlexibleBox.cpp b/Source/WebCore/rendering/RenderFlexibleBox.cpp
>index 2cc93d6ad93a0ad522c908518873b2912d7fc121..34e1f04dc3addbb8978882bb95458745801852d9 100644
>--- a/Source/WebCore/rendering/RenderFlexibleBox.cpp
>+++ b/Source/WebCore/rendering/RenderFlexibleBox.cpp
>@@ -160,7 +160,7 @@ int RenderFlexibleBox::baselinePosition(FontBaseline, bool, LineDirectionMode di
> 
> Optional<int> RenderFlexibleBox::firstLineBaseline() const
> {
>-    if (isWritingModeRoot() || m_numberOfInFlowChildrenOnFirstLine <= 0)
>+    if (isWritingModeRoot() || m_numberOfInFlowChildrenOnFirstLine <= 0 || shouldApplyLayoutContainment())
>         return Optional<int>();
>     RenderBox* baselineChild = nullptr;
>     int childNumber = 0;
>diff --git a/Source/WebCore/rendering/RenderGrid.cpp b/Source/WebCore/rendering/RenderGrid.cpp
>index 60eb01e2505616d42c68c7904aea790b45768d0d..fd8b9292e15986d39ffc82b08740a1b75a42dfde 100644
>--- a/Source/WebCore/rendering/RenderGrid.cpp
>+++ b/Source/WebCore/rendering/RenderGrid.cpp
>@@ -1261,7 +1261,7 @@ int RenderGrid::baselinePosition(FontBaseline, bool, LineDirectionMode direction
> 
> Optional<int> RenderGrid::firstLineBaseline() const
> {
>-    if (isWritingModeRoot() || !m_grid.hasGridItems())
>+    if (isWritingModeRoot() || !m_grid.hasGridItems() || shouldApplyLayoutContainment())
>         return WTF::nullopt;
> 
>     const RenderBox* baselineChild = nullptr;
>diff --git a/Source/WebCore/rendering/RenderLayer.cpp b/Source/WebCore/rendering/RenderLayer.cpp
>index 847473025ebf06b460b03f87fe83c36393132a68..cab6dbadd81b305fe03187d41e419bae3edc596a 100644
>--- a/Source/WebCore/rendering/RenderLayer.cpp
>+++ b/Source/WebCore/rendering/RenderLayer.cpp
>@@ -581,7 +581,7 @@ bool RenderLayer::shouldBeNormalFlowOnly() const
> 
> bool RenderLayer::shouldBeCSSStackingContext() const
> {
>-    return !renderer().style().hasAutoUsedZIndex() || isRenderViewLayer();
>+    return renderer().shouldApplyLayoutContainment() || !renderer().style().hasAutoUsedZIndex() || isRenderViewLayer();
> }
> 
> bool RenderLayer::setIsNormalFlowOnly(bool isNormalFlowOnly)
>diff --git a/Source/WebCore/rendering/RenderObject.cpp b/Source/WebCore/rendering/RenderObject.cpp
>index 567ea64d57e179b1aa36abb12751a957d4a5574e..3612e760df1fb6ba80f893fafe603a246f3e86ea 100644
>--- a/Source/WebCore/rendering/RenderObject.cpp
>+++ b/Source/WebCore/rendering/RenderObject.cpp
>@@ -502,6 +502,9 @@ static inline bool objectIsRelayoutBoundary(const RenderElement* object)
>     if (object->isTextControl())
>         return true;
> 
>+    if (object->shouldApplyLayoutContainment())
>+        return true;
>+
>     if (object->isSVGRoot())
>         return true;
> 
>diff --git a/Source/WebCore/rendering/RenderObject.h b/Source/WebCore/rendering/RenderObject.h
>index 39f9ebee288f3b50d571746149559ba6b649b552..6137fb931f4f3f4c51b0885e8f20054ce7b7ee9e 100644
>--- a/Source/WebCore/rendering/RenderObject.h
>+++ b/Source/WebCore/rendering/RenderObject.h
>@@ -181,6 +181,11 @@ public:
>     virtual bool createsAnonymousWrapper() const { return false; }
>     //////////////////////////////////////////
> 
>+    inline bool shouldApplyLayoutContainment() const
>+    {
>+        return style().containsLayout() && (!isInline() || isReplaced()) && !isRubyText() && (!isTablePart() || isRenderBlockFlow());
>+    }
>+
> #if ENABLE(TREE_DEBUGGING)
>     void showNodeTreeForThis() const;
>     void showRenderTreeForThis() const;
>diff --git a/Source/WebCore/rendering/style/RenderStyle.h b/Source/WebCore/rendering/style/RenderStyle.h
>index 2cc2719be82744375e8f8eef7a5be863ce326faf..a23a50cc0ce60540f84309e1cbd79ee0cdc0f1be 100644
>--- a/Source/WebCore/rendering/style/RenderStyle.h
>+++ b/Source/WebCore/rendering/style/RenderStyle.h
>@@ -521,6 +521,8 @@ public:
>         return boxSizing();
>     }
>     bool hasAspectRatio() const { return aspectRatioType() == AspectRatioType::Ratio || aspectRatioType() == AspectRatioType::AutoAndRatio; }
>+    OptionSet<Containment> contain() const { return m_rareNonInheritedData->contain; }
>+    bool containsLayout() const { return m_rareNonInheritedData->contain.contains(Containment::Layout); }
>     BoxAlignment boxAlign() const { return static_cast<BoxAlignment>(m_rareNonInheritedData->deprecatedFlexibleBox->align); }
>     BoxDirection boxDirection() const { return static_cast<BoxDirection>(m_inheritedFlags.boxDirection); }
>     float boxFlex() const { return m_rareNonInheritedData->deprecatedFlexibleBox->flex; }
>@@ -1033,6 +1035,8 @@ public:
>     void setAspectRatioType(AspectRatioType aspectRatioType) { SET_VAR(m_rareNonInheritedData, aspectRatioType, static_cast<unsigned>(aspectRatioType)); }
>     void setAspectRatio(double width, double height) { SET_VAR(m_rareNonInheritedData, aspectRatioWidth, width); SET_VAR(m_rareNonInheritedData, aspectRatioHeight, height); }
> 
>+    void setContain(OptionSet<Containment> containment) { SET_VAR(m_rareNonInheritedData, contain, containment); }
>+
>     void setListStyleStringValue(const AtomString& value) { SET_VAR(m_rareInheritedData, listStyleStringValue, value); }
>     void setListStyleType(ListStyleType v) { m_inheritedFlags.listStyleType = static_cast<unsigned>(v); }
>     void setListStyleImage(RefPtr<StyleImage>&&);
>@@ -1635,6 +1639,9 @@ public:
>     static Resize initialResize() { return Resize::None; }
>     static ControlPart initialAppearance() { return NoControlPart; }
>     static AspectRatioType initialAspectRatioType() { return AspectRatioType::Auto; }
>+    static OptionSet<Containment> initialContainment() { return OptionSet<Containment> { }; }
>+    static OptionSet<Containment> strictContainment() { return OptionSet<Containment> { Containment::Size, Containment::Layout, Containment::Paint }; }
>+    static OptionSet<Containment> contentContainment() { return OptionSet<Containment> { Containment::Layout, Containment::Paint }; }
>     static double initialAspectRatioWidth() { return 1.0; }
>     static double initialAspectRatioHeight() { return 1.0; }
>     static Order initialRTLOrdering() { return Order::Logical; }
>diff --git a/Source/WebCore/rendering/style/RenderStyleConstants.h b/Source/WebCore/rendering/style/RenderStyleConstants.h
>index 8ad708f041de6e9868d9ccb5aeed163cfb3a128f..85e2d022410e04fbfe0550ef4080c271f1d804f2 100644
>--- a/Source/WebCore/rendering/style/RenderStyleConstants.h
>+++ b/Source/WebCore/rendering/style/RenderStyleConstants.h
>@@ -1208,6 +1208,13 @@ enum class MathStyle : uint8_t {
>     Compact,
> };
> 
>+enum class Containment : uint8_t {
>+    Layout   = 1 << 0,
>+    Style    = 1 << 1,
>+    Paint    = 1 << 2,
>+    Size     = 1 << 3,
>+};
>+
> extern const float defaultMiterLimit;
> 
> WTF::TextStream& operator<<(WTF::TextStream&, AnimationFillMode);
>diff --git a/Source/WebCore/rendering/style/StyleRareNonInheritedData.cpp b/Source/WebCore/rendering/style/StyleRareNonInheritedData.cpp
>index e4c67478f72c2b9b7342161bcdfae5454a5fe69d..89d102e2cf99a5990a74ce69e325d49d6f0fc2b0 100644
>--- a/Source/WebCore/rendering/style/StyleRareNonInheritedData.cpp
>+++ b/Source/WebCore/rendering/style/StyleRareNonInheritedData.cpp
>@@ -43,6 +43,7 @@ StyleRareNonInheritedData::StyleRareNonInheritedData()
>     : opacity(RenderStyle::initialOpacity())
>     , aspectRatioWidth(RenderStyle::initialAspectRatioWidth())
>     , aspectRatioHeight(RenderStyle::initialAspectRatioHeight())
>+    , contain(RenderStyle::initialContainment())
>     , perspective(RenderStyle::initialPerspective())
>     , perspectiveOriginX(RenderStyle::initialPerspectiveOriginX())
>     , perspectiveOriginY(RenderStyle::initialPerspectiveOriginY())
>@@ -120,6 +121,7 @@ inline StyleRareNonInheritedData::StyleRareNonInheritedData(const StyleRareNonIn
>     , opacity(o.opacity)
>     , aspectRatioWidth(o.aspectRatioWidth)
>     , aspectRatioHeight(o.aspectRatioHeight)
>+    , contain(o.contain)
>     , perspective(o.perspective)
>     , perspectiveOriginX(o.perspectiveOriginX)
>     , perspectiveOriginY(o.perspectiveOriginY)
>@@ -227,6 +229,7 @@ bool StyleRareNonInheritedData::operator==(const StyleRareNonInheritedData& o) c
>     return opacity == o.opacity
>         && aspectRatioWidth == o.aspectRatioWidth
>         && aspectRatioHeight == o.aspectRatioHeight
>+        && contain == o.contain
>         && perspective == o.perspective
>         && perspectiveOriginX == o.perspectiveOriginX
>         && perspectiveOriginY == o.perspectiveOriginY
>diff --git a/Source/WebCore/rendering/style/StyleRareNonInheritedData.h b/Source/WebCore/rendering/style/StyleRareNonInheritedData.h
>index fc7eafcef3e94d636895c62f7af7c45a08172f0e..77bab950837c7498b111bf968da24af8abbe1b1a 100644
>--- a/Source/WebCore/rendering/style/StyleRareNonInheritedData.h
>+++ b/Source/WebCore/rendering/style/StyleRareNonInheritedData.h
>@@ -109,6 +109,8 @@ public:
>     double aspectRatioWidth;
>     double aspectRatioHeight;
> 
>+    OptionSet<Containment> contain;
>+
>     float perspective;
>     Length perspectiveOriginX;
>     Length perspectiveOriginY;
>diff --git a/Source/WebCore/style/StyleBuilderCustom.h b/Source/WebCore/style/StyleBuilderCustom.h
>index e688f29b0a8fe2e22132e8deaf7573b924afbdd2..5ffce5fb0b5dc02ee1cbc19536779683e052abd6 100644
>--- a/Source/WebCore/style/StyleBuilderCustom.h
>+++ b/Source/WebCore/style/StyleBuilderCustom.h
>@@ -78,6 +78,7 @@ public:
>     DECLARE_PROPERTY_CUSTOM_HANDLERS(BorderImageWidth);
>     DECLARE_PROPERTY_CUSTOM_HANDLERS(BoxShadow);
>     DECLARE_PROPERTY_CUSTOM_HANDLERS(Clip);
>+    DECLARE_PROPERTY_CUSTOM_HANDLERS(Contain);
>     DECLARE_PROPERTY_CUSTOM_HANDLERS(Content);
>     DECLARE_PROPERTY_CUSTOM_HANDLERS(CounterIncrement);
>     DECLARE_PROPERTY_CUSTOM_HANDLERS(CounterReset);
>@@ -1199,6 +1200,53 @@ inline void BuilderCustom::applyValueAspectRatio(BuilderState& builderState, CSS
>     builderState.style().setAspectRatio(width, height);
> }
> 
>+inline void BuilderCustom::applyInitialContain(BuilderState& builderState)
>+{
>+    builderState.style().setContain(RenderStyle::initialContainment());
>+}
>+
>+inline void BuilderCustom::applyInheritContain(BuilderState& builderState)
>+{
>+    builderState.style().setContain(forwardInheritedValue(builderState.parentStyle().contain()));
>+}
>+
>+inline void BuilderCustom::applyValueContain(BuilderState& builderState, CSSValue& value)
>+{
>+    if (is<CSSPrimitiveValue>(value)) {
>+        if (downcast<CSSPrimitiveValue>(value).valueID() == CSSValueNone)
>+            return builderState.style().setContain(RenderStyle::initialContainment());
>+        if (downcast<CSSPrimitiveValue>(value).valueID() == CSSValueStrict)
>+            return builderState.style().setContain(RenderStyle::strictContainment());
>+        return builderState.style().setContain(RenderStyle::contentContainment());
>+    }
>+
>+    if (!is<CSSValueList>(value))
>+        return;
>+
>+    OptionSet<Containment> containment;
>+    auto& list = downcast<CSSValueList>(value);
>+    for (auto& item : list) {
>+        auto& value = downcast<CSSPrimitiveValue>(item.get());
>+        switch (value.valueID()) {
>+        case CSSValueSize:
>+            containment.add(Containment::Size);
>+            break;
>+        case CSSValueLayout:
>+            containment.add(Containment::Layout);
>+            break;
>+        case CSSValueStyle:
>+            containment.add(Containment::Style);
>+            break;
>+        case CSSValuePaint:
>+            containment.add(Containment::Paint);
>+            break;
>+        default:
>+            break;
>+        };
>+    }
>+    return builderState.style().setContain(containment);
>+}
>+
> inline void BuilderCustom::applyValueWebkitTextEmphasisStyle(BuilderState& builderState, CSSValue& value)
> {
>     if (is<CSSValueList>(value)) {
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index 70a56e5b6e37c9214da594258dc79f5a181b89dc..a153d52dbfb0b1317436e5a89cca7ed33d16b4eb 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,13 @@
>+2021-03-22  Rob Buis  <rbuis@igalia.com>
>+
>+        Support contain: layout
>+        https://bugs.webkit.org/show_bug.cgi?id=223569
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * DumpRenderTree/TestOptions.cpp:
>+        (WTR::TestOptions::defaults):
>+
> 2021-03-19  BJ Burg  <bburg@apple.com>
> 
>         Update filter-build-webkit
>diff --git a/Tools/DumpRenderTree/TestOptions.cpp b/Tools/DumpRenderTree/TestOptions.cpp
>index 7eeef3cd26ca8b982edcfb8f850d2a6cb8c79e0d..c0480d340d4a1f0fba52b3ace562e8c0bfe393d0 100644
>--- a/Tools/DumpRenderTree/TestOptions.cpp
>+++ b/Tools/DumpRenderTree/TestOptions.cpp
>@@ -133,6 +133,7 @@ const TestFeatures& TestOptions::defaults()
>             { "AspectRatioEnabled", true },
>             { "AsyncClipboardAPIEnabled", false },
>             { "AttachmentElementEnabled", false },
>+            { "CSSContainmentEnabled", false },
>             { "CSSLogicalEnabled", false },
>             { "CSSOMViewSmoothScrollingEnabled", false },
>             { "ColorFilterEnabled", false },
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index 567ba48360ad7122bdd4d852da22ad5ae02b4e0e..79fbc85f3b61b871b3d2a4845519bf2b828f95d2 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,17 @@
>+2021-03-22  Rob Buis  <rbuis@igalia.com>
>+
>+        Support contain: layout
>+        https://bugs.webkit.org/show_bug.cgi?id=223569
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * TestExpectations:
>+        * fast/css/contain-invalidate-if-disabled-expected.txt: Added.
>+        * fast/css/contain-invalidate-if-disabled.html: Added.
>+        * platform/gtk/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt:
>+        * platform/ios-wk2/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt:
>+        * platform/wpe/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt:
>+
> 2021-03-19  Chris Dumez  <cdumez@apple.com>
> 
>         Resync webaudio web-platform-tests from upstream
>diff --git a/LayoutTests/imported/w3c/ChangeLog b/LayoutTests/imported/w3c/ChangeLog
>index 71ebef536fe0bf91e1a987c54fda0413839405c9..43f8807498f9ee0fbad449bd53245517699a6e89 100644
>--- a/LayoutTests/imported/w3c/ChangeLog
>+++ b/LayoutTests/imported/w3c/ChangeLog
>@@ -1,3 +1,17 @@
>+2021-03-22  Rob Buis  <rbuis@igalia.com>
>+
>+        Support contain: layout
>+        https://bugs.webkit.org/show_bug.cgi?id=223569
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
>+        * web-platform-tests/css/css-contain/content-visibility/content-visibility-026-expected.txt:
>+        * web-platform-tests/css/css-contain/inheritance-expected.txt:
>+        * web-platform-tests/css/css-contain/parsing/contain-computed-expected.txt:
>+        * web-platform-tests/css/css-contain/parsing/contain-valid-expected.txt:
>+        * web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt:
>+
> 2021-03-19  Chris Dumez  <cdumez@apple.com>
> 
>         Resync webaudio web-platform-tests from upstream
>diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
>index 94426dc89178f500c8fdb49c1959024bbde2824a..aa8a4aa8bce4595efc544a08b8253b53853f0cd9 100644
>--- a/LayoutTests/TestExpectations
>+++ b/LayoutTests/TestExpectations
>@@ -4724,20 +4724,8 @@ webkit.org/b/220928 imported/w3c/web-platform-tests/css/css-color/predefined-015
> 
> # CSS containment tests that fail
> imported/w3c/web-platform-tests/css/css-contain/contain-animation-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-content-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-content-002.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-content-003.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-content-004.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-content-011.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-006.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-007.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-013.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-014.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-016.html [ ImageOnlyFailure ]
>+#imported/w3c/web-platform-tests/css/css-contain/contain-layout-016.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/contain-layout-baseline-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-baseline-002.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-baseline-003.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-baseline-004.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/contain-layout-baseline-005.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-001.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-003.html [ ImageOnlyFailure ]
>@@ -4754,16 +4742,6 @@ imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visib
> imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-021.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-022.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/contain-layout-button-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-cell-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-cell-002.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-containing-block-absolute-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-containing-block-fixed-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-flexbox-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-formatting-context-float-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-formatting-context-margin-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-grid-001.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-ifc-022.html [ ImageOnlyFailure ]
>-imported/w3c/web-platform-tests/css/css-contain/contain-layout-independent-formatting-context-001.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/contain-layout-ink-overflow-013.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/contain-layout-ink-overflow-014.html [ ImageOnlyFailure ]
> imported/w3c/web-platform-tests/css/css-contain/contain-layout-ink-overflow-015.html [ ImageOnlyFailure ]
>diff --git a/LayoutTests/fast/css/contain-invalidate-if-disabled-expected.txt b/LayoutTests/fast/css/contain-invalidate-if-disabled-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..4bea844eff5538612dac8e924fa6f95fe1037bcc
>--- /dev/null
>+++ b/LayoutTests/fast/css/contain-invalidate-if-disabled-expected.txt
>@@ -0,0 +1,13 @@
>+Tests that contain is not exposed when the feature is disabled
>+
>+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
>+
>+
>+PASS 'contain' in document.documentElement.style is false
>+PASS 'contain' in getComputedStyle(document.documentElement) is false
>+PASS CSS.supports('contain: paint') is false
>+PASS CSS.supports('contain: inherit') is false
>+PASS successfullyParsed is true
>+
>+TEST COMPLETE
>+
>diff --git a/LayoutTests/fast/css/contain-invalidate-if-disabled.html b/LayoutTests/fast/css/contain-invalidate-if-disabled.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..0e9f147afd60a8c9902a6a236d8dae39781e5696
>--- /dev/null
>+++ b/LayoutTests/fast/css/contain-invalidate-if-disabled.html
>@@ -0,0 +1,18 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+<meta charset="utf-8">
>+<script src="../../resources/js-test.js"></script>
>+</head>
>+<body>
>+<script>
>+description("Tests that contain is not exposed when the feature is disabled");
>+
>+shouldBeFalse("'contain' in document.documentElement.style");
>+shouldBeFalse("'contain' in getComputedStyle(document.documentElement)");
>+shouldBeFalse("CSS.supports('contain: paint')");
>+shouldBeFalse("CSS.supports('contain: inherit')");
>+
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt
>index e21659ac9195584b9754658d61c1ca018b275806..d3e889f15674bff4e2aedbf21070c44698db713a 100644
>--- a/LayoutTests/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt
>@@ -93,6 +93,7 @@ PASS column-rule-style
> PASS column-rule-width
> PASS column-span
> PASS column-width
>+PASS contain
> PASS content
> PASS counter-increment
> PASS counter-reset
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-026-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-026-expected.txt
>index 88f42f251b2905fcc00d4e3e5f4a6bcc75f4c9f2..65e15308496a92f2712751681fe689ea6ff30655 100644
>--- a/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-026-expected.txt
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-026-expected.txt
>@@ -1,6 +1,6 @@
> 
>-FAIL content-visibility: hidden adds contain: size layout style; assert_equals: expected (string) "none" but got (undefined) undefined
>-FAIL content-visibility: auto adds contain: size layout style paint; assert_equals: expected (string) "none" but got (undefined) undefined
>-FAIL content-visibility: auto adds contain: size layout style paint, can't be overridden assert_equals: expected (string) "none" but got (undefined) undefined
>-FAIL content-visibility keeps all containment even when shorthands are specified assert_equals: expected (string) "none" but got (undefined) undefined
>+FAIL content-visibility: hidden adds contain: size layout style; assert_equals: expected "size layout style paint" but got "none"
>+FAIL content-visibility: auto adds contain: size layout style paint; assert_equals: initial onscreen expected "size layout style paint" but got "none"
>+FAIL content-visibility: auto adds contain: size layout style paint, can't be overridden assert_equals: expected "size layout style paint" but got "style"
>+FAIL content-visibility keeps all containment even when shorthands are specified assert_equals: expected "size layout style paint" but got "paint"
> 
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/inheritance-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/inheritance-expected.txt
>index a747d4959e910557fa697128806abab1e5458057..76b2f7e1f086c1e746cdd84c3b0fb663a623cb71 100644
>--- a/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/inheritance-expected.txt
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/inheritance-expected.txt
>@@ -1,4 +1,4 @@
> 
>-FAIL Property contain has initial value none assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain does not inherit assert_true: expected true got false
>+PASS Property contain has initial value none
>+PASS Property contain does not inherit
> 
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/parsing/contain-computed-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/parsing/contain-computed-expected.txt
>index 69941a573150d1bd36c85d2a0db841049faeab26..5bfc9e45e3c5fe1b147894beb1dc59b3f271625b 100644
>--- a/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/parsing/contain-computed-expected.txt
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/parsing/contain-computed-expected.txt
>@@ -1,15 +1,15 @@
> 
>-FAIL Property contain value 'none' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'strict' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'content' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'size' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'layout' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'style' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'paint' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'size layout' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'style paint' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'layout style paint' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'size layout style paint' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'size layout paint' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>-FAIL Property contain value 'layout paint' assert_true: contain doesn't seem to be supported in the computed style expected true got false
>+PASS Property contain value 'none'
>+PASS Property contain value 'strict'
>+PASS Property contain value 'content'
>+PASS Property contain value 'size'
>+PASS Property contain value 'layout'
>+PASS Property contain value 'style'
>+PASS Property contain value 'paint'
>+PASS Property contain value 'size layout'
>+PASS Property contain value 'style paint'
>+PASS Property contain value 'layout style paint'
>+PASS Property contain value 'size layout style paint'
>+PASS Property contain value 'size layout paint'
>+PASS Property contain value 'layout paint'
> 
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/parsing/contain-valid-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/parsing/contain-valid-expected.txt
>index e3a2f80ecc8880f1b3872c435716f0bd4165a258..85fcfe17397b2966a096aea68388d3c7f1753af6 100644
>--- a/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/parsing/contain-valid-expected.txt
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/css-contain/parsing/contain-valid-expected.txt
>@@ -1,13 +1,13 @@
> 
>-FAIL e.style['contain'] = "none" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "strict" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "content" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "size" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "layout" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "style" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "paint" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "layout size" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "paint style" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "layout style paint" should set the property value assert_not_equals: property should be set got disallowed value ""
>-FAIL e.style['contain'] = "layout paint style size" should set the property value assert_not_equals: property should be set got disallowed value ""
>+PASS e.style['contain'] = "none" should set the property value
>+PASS e.style['contain'] = "strict" should set the property value
>+PASS e.style['contain'] = "content" should set the property value
>+PASS e.style['contain'] = "size" should set the property value
>+PASS e.style['contain'] = "layout" should set the property value
>+PASS e.style['contain'] = "style" should set the property value
>+PASS e.style['contain'] = "paint" should set the property value
>+PASS e.style['contain'] = "layout size" should set the property value
>+PASS e.style['contain'] = "paint style" should set the property value
>+PASS e.style['contain'] = "layout style paint" should set the property value
>+PASS e.style['contain'] = "layout paint style size" should set the property value
> 
>diff --git a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>index 206e47542edd67f10722e2a5094a93a08c2c8395..c63a444dea0542c03d0bd26610fed1d55821cae5 100644
>--- a/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>+++ b/LayoutTests/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>@@ -7,5 +7,5 @@ PASS cssText order
> PASS another cssText order (non-alphabetical order)
> PASS whitespaces in value
> PASS invalid property does not appear
>-FAIL cssText on computed style declaration returns the empty string assert_equals: cssText is empty expected "" but got "align-content: normal; align-items: normal; align-self: auto; alignment-baseline: auto; all: ; alt: \"\"; animation-delay: 0s; animation-direction: normal; animation-duration: 0s; animation-fill-mode: none; animation-iteration-count: 1; animation-name: none; animation-play-state: running; animation-timing-function: ease; aspect-ratio: auto; background-attachment: scroll; background-blend-mode: normal; background-clip: border-box; background-color: rgba(0, 0, 0, 0); background-image: none; background-origin: padding-box; background-position-x: 0%; background-position-y: 0%; background-repeat: repeat; background-size: auto; baseline-shift: baseline; block-size: 0px; border-block-end-color: rgb(255, 0, 0); border-block-end-style: none; border-block-end-width: 0px; border-block-start-color: rgb(255, 0, 0); border-block-start-style: none; border-block-start-width: 0px; border-bottom-color: rgb(255, 0, 0); border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-bottom-style: none; border-bottom-width: 0px; border-collapse: separate; border-end-end-radius: 0px; border-end-start-radius: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-inline-end-color: rgb(255, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(255, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(255, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(255, 0, 0); border-right-style: none; border-right-width: 0px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-color: rgb(255, 0, 0); border-top-left-radius: 0px; border-top-right-radius: 0px; border-top-style: none; border-top-width: 0px; bottom: auto; box-shadow: none; box-sizing: content-box; break-after: auto; break-before: auto; break-inside: auto; buffered-rendering: auto; caption-side: top; caret-color: rgb(255, 0, 0); clear: none; clip: auto; clip-path: none; clip-rule: nonzero; color: rgb(255, 0, 0); color-interpolation: sRGB; color-interpolation-filters: linearRGB; color-rendering: auto; color-scheme: auto; column-count: auto; column-fill: balance; column-gap: normal; column-rule-color: rgb(255, 0, 0); column-rule-style: none; column-rule-width: 0px; column-span: none; column-width: auto; content: ; counter-increment: none; counter-reset: none; cursor: auto; cx: 0px; cy: 0px; direction: ltr; display: block; dominant-baseline: auto; empty-cells: show; fill: rgb(0, 0, 0); fill-opacity: 1; fill-rule: nonzero; filter: none; flex-basis: auto; flex-direction: row; flex-grow: 0; flex-shrink: 1; flex-wrap: nowrap; float: none; flood-color: rgb(0, 0, 0); flood-opacity: 1; font-family: -webkit-standard; font-feature-settings: normal; font-optical-sizing: auto; font-size: 13.333333015441895px; font-stretch: normal; font-style: normal; font-synthesis: style weight small-caps; font-variant-alternates: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-ligatures: normal; font-variant-numeric: normal; font-variant-position: normal; font-variation-settings: normal; font-weight: normal; glyph-orientation-horizontal: 0deg; glyph-orientation-vertical: auto; grid-auto-columns: auto; grid-auto-flow: row; grid-auto-rows: auto; grid-column-end: auto; grid-column-start: auto; grid-row-end: auto; grid-row-start: auto; grid-template-areas: none; grid-template-columns: none; grid-template-rows: none; hanging-punctuation: none; height: 0px; image-orientation: from-image; image-rendering: auto; inline-size: 784px; inset-block-end: auto; inset-block-start: auto; inset-inline-end: auto; inset-inline-start: auto; isolation: auto; justify-content: normal; justify-items: normal; justify-self: auto; kerning: 0; left: auto; letter-spacing: normal; lighting-color: rgb(255, 255, 255); line-break: auto; line-height: normal; list-style-image: none; list-style-position: outside; list-style-type: disc; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; marker-end: none; marker-mid: none; marker-start: none; mask: none; mask-type: luminance; math-style: normal; max-block-size: none; max-height: none; max-inline-size: none; max-width: none; min-block-size: 0px; min-height: 0px; min-inline-size: 0px; min-width: 0px; mix-blend-mode: normal; object-fit: fill; object-position: 50% 50%; opacity: 1; order: 0; orphans: auto; outline-color: rgb(255, 0, 0); outline-offset: 0px; outline-style: none; outline-width: 0px; overflow-wrap: normal; overflow-x: visible; overflow-y: visible; overscroll-behavior-x: auto; overscroll-behavior-y: auto; padding-block-end: 0px; padding-block-start: 0px; padding-bottom: 0px; padding-inline-end: 0px; padding-inline-start: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; page-break-after: auto; page-break-before: auto; page-break-inside: auto; paint-order: normal; perspective: none; perspective-origin-x: ; perspective-origin-y: ; pointer-events: auto; position: static; quotes: auto; r: 0px; resize: none; right: auto; rotate: none; row-gap: normal; rx: auto; ry: auto; scale: none; scroll-behavior: auto; scroll-margin-block: 0px; scroll-margin-bottom: 0px; scroll-margin-inline: 0px; scroll-margin-left: 0px; scroll-margin-right: 0px; scroll-margin-top: 0px; scroll-padding-block: auto; scroll-padding-bottom: auto; scroll-padding-inline: auto; scroll-padding-left: auto; scroll-padding-right: auto; scroll-padding-top: auto; scroll-snap-align: none; scroll-snap-stop: normal; scroll-snap-type: none; shape-image-threshold: 0; shape-margin: 0px; shape-outside: none; shape-rendering: auto; size: ; speak-as: normal; stop-color: rgb(0, 0, 0); stop-opacity: 1; stroke: none; stroke-color: rgba(0, 0, 0, 0); stroke-dasharray: none; stroke-dashoffset: 0px; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 4; stroke-opacity: 1; stroke-width: 1px; tab-size: 8; table-layout: auto; text-align: start; text-anchor: start; text-decoration: none; text-decoration-color: rgb(255, 0, 0); text-decoration-line: none; text-decoration-skip: auto; text-decoration-style: solid; text-decoration-thickness: auto; text-indent: 0px; text-orientation: mixed; text-overflow: clip; text-rendering: auto; text-shadow: none; text-transform: none; text-underline-offset: auto; text-underline-position: auto; top: auto; touch-action: auto; transform: none; transform-box: view-box; transform-origin-x: ; transform-origin-y: ; transform-origin-z: ; transform-style: flat; transition-delay: 0s; transition-duration: 0s; transition-property: all; transition-timing-function: ease; translate: none; unicode-bidi: normal; vector-effect: none; vertical-align: baseline; visibility: visible; white-space: normal; widows: auto; width: 784px; will-change: auto; word-break: normal; word-spacing: 0px; word-wrap: normal; writing-mode: horizontal-tb; x: 0px; y: 0px; z-index: auto; zoom: 1; -apple-color-filter: none; -apple-pay-button-style: black; -apple-pay-button-type: plain; -apple-trailing-word: auto; -webkit-appearance: none; -webkit-backdrop-filter: none; -webkit-backface-visibility: visible; -webkit-background-clip: border-box; -webkit-background-composite: source-over; -webkit-background-origin: padding-box; -webkit-background-size: auto; -webkit-border-fit: border; -webkit-border-horizontal-spacing: 0px; -webkit-border-image: none; -webkit-border-vertical-spacing: 0px; -webkit-box-align: stretch; -webkit-box-decoration-break: slice; -webkit-box-direction: normal; -webkit-box-flex: 0; -webkit-box-flex-group: 1; -webkit-box-lines: single; -webkit-box-ordinal-group: 1; -webkit-box-orient: horizontal; -webkit-box-pack: start; -webkit-box-reflect: none; -webkit-box-shadow: none; -webkit-column-axis: auto; -webkit-column-break-after: auto; -webkit-column-break-before: auto; -webkit-column-break-inside: auto; -webkit-column-progression: normal; -webkit-cursor-visibility: auto; -webkit-font-kerning: auto; -webkit-font-smoothing: auto; -webkit-hyphenate-character: auto; -webkit-hyphenate-limit-after: auto; -webkit-hyphenate-limit-before: auto; -webkit-hyphenate-limit-lines: no-limit; -webkit-hyphens: manual; -webkit-initial-letter: normal; -webkit-line-align: none; -webkit-line-box-contain: block inline replaced; -webkit-line-clamp: none; -webkit-line-grid: none; -webkit-line-snap: none; -webkit-locale: auto; -webkit-margin-after-collapse: collapse; -webkit-margin-before-collapse: collapse; -webkit-margin-bottom-collapse: collapse; -webkit-margin-top-collapse: collapse; -webkit-mask-box-image: none; -webkit-mask-box-image-outset: 0; -webkit-mask-box-image-repeat: stretch; -webkit-mask-box-image-slice: 0 fill; -webkit-mask-box-image-source: none; -webkit-mask-box-image-width: auto; -webkit-mask-clip: border-box; -webkit-mask-composite: source-over; -webkit-mask-image: none; -webkit-mask-origin: border-box; -webkit-mask-position-x: 0%; -webkit-mask-position-y: 0%; -webkit-mask-repeat: repeat; -webkit-mask-size: auto; -webkit-mask-source-type: alpha; -webkit-nbsp-mode: normal; -webkit-print-color-adjust: economy; -webkit-rtl-ordering: logical; -webkit-ruby-position: before; -webkit-text-combine: none; -webkit-text-emphasis-color: rgb(255, 0, 0); -webkit-text-emphasis-position: over right; -webkit-text-emphasis-style: none; -webkit-text-fill-color: rgb(255, 0, 0); -webkit-text-orientation: mixed; -webkit-text-security: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-color: rgb(255, 0, 0); -webkit-text-stroke-width: 0px; -webkit-text-zoom: normal; -webkit-transform-style: flat; -webkit-user-drag: auto; -webkit-user-modify: read-only; -webkit-user-select: text;"
>+FAIL cssText on computed style declaration returns the empty string assert_equals: cssText is empty expected "" but got "align-content: normal; align-items: normal; align-self: auto; alignment-baseline: auto; all: ; alt: \"\"; animation-delay: 0s; animation-direction: normal; animation-duration: 0s; animation-fill-mode: none; animation-iteration-count: 1; animation-name: none; animation-play-state: running; animation-timing-function: ease; aspect-ratio: auto; background-attachment: scroll; background-blend-mode: normal; background-clip: border-box; background-color: rgba(0, 0, 0, 0); background-image: none; background-origin: padding-box; background-position-x: 0%; background-position-y: 0%; background-repeat: repeat; background-size: auto; baseline-shift: baseline; block-size: 0px; border-block-end-color: rgb(255, 0, 0); border-block-end-style: none; border-block-end-width: 0px; border-block-start-color: rgb(255, 0, 0); border-block-start-style: none; border-block-start-width: 0px; border-bottom-color: rgb(255, 0, 0); border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-bottom-style: none; border-bottom-width: 0px; border-collapse: separate; border-end-end-radius: 0px; border-end-start-radius: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-inline-end-color: rgb(255, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(255, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(255, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(255, 0, 0); border-right-style: none; border-right-width: 0px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-color: rgb(255, 0, 0); border-top-left-radius: 0px; border-top-right-radius: 0px; border-top-style: none; border-top-width: 0px; bottom: auto; box-shadow: none; box-sizing: content-box; break-after: auto; break-before: auto; break-inside: auto; buffered-rendering: auto; caption-side: top; caret-color: rgb(255, 0, 0); clear: none; clip: auto; clip-path: none; clip-rule: nonzero; color: rgb(255, 0, 0); color-interpolation: sRGB; color-interpolation-filters: linearRGB; color-rendering: auto; color-scheme: auto; column-count: auto; column-fill: balance; column-gap: normal; column-rule-color: rgb(255, 0, 0); column-rule-style: none; column-rule-width: 0px; column-span: none; column-width: auto; contain: none; content: ; counter-increment: none; counter-reset: none; cursor: auto; cx: 0px; cy: 0px; direction: ltr; display: block; dominant-baseline: auto; empty-cells: show; fill: rgb(0, 0, 0); fill-opacity: 1; fill-rule: nonzero; filter: none; flex-basis: auto; flex-direction: row; flex-grow: 0; flex-shrink: 1; flex-wrap: nowrap; float: none; flood-color: rgb(0, 0, 0); flood-opacity: 1; font-family: -webkit-standard; font-feature-settings: normal; font-optical-sizing: auto; font-size: 13.333333015441895px; font-stretch: normal; font-style: normal; font-synthesis: style weight small-caps; font-variant-alternates: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-ligatures: normal; font-variant-numeric: normal; font-variant-position: normal; font-variation-settings: normal; font-weight: normal; glyph-orientation-horizontal: 0deg; glyph-orientation-vertical: auto; grid-auto-columns: auto; grid-auto-flow: row; grid-auto-rows: auto; grid-column-end: auto; grid-column-start: auto; grid-row-end: auto; grid-row-start: auto; grid-template-areas: none; grid-template-columns: none; grid-template-rows: none; hanging-punctuation: none; height: 0px; image-orientation: from-image; image-rendering: auto; inline-size: 784px; inset-block-end: auto; inset-block-start: auto; inset-inline-end: auto; inset-inline-start: auto; isolation: auto; justify-content: normal; justify-items: normal; justify-self: auto; kerning: 0; left: auto; letter-spacing: normal; lighting-color: rgb(255, 255, 255); line-break: auto; line-height: normal; list-style-image: none; list-style-position: outside; list-style-type: disc; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; marker-end: none; marker-mid: none; marker-start: none; mask: none; mask-type: luminance; math-style: normal; max-block-size: none; max-height: none; max-inline-size: none; max-width: none; min-block-size: 0px; min-height: 0px; min-inline-size: 0px; min-width: 0px; mix-blend-mode: normal; object-fit: fill; object-position: 50% 50%; opacity: 1; order: 0; orphans: auto; outline-color: rgb(255, 0, 0); outline-offset: 0px; outline-style: none; outline-width: 0px; overflow-wrap: normal; overflow-x: visible; overflow-y: visible; overscroll-behavior-x: auto; overscroll-behavior-y: auto; padding-block-end: 0px; padding-block-start: 0px; padding-bottom: 0px; padding-inline-end: 0px; padding-inline-start: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; page-break-after: auto; page-break-before: auto; page-break-inside: auto; paint-order: normal; perspective: none; perspective-origin-x: ; perspective-origin-y: ; pointer-events: auto; position: static; quotes: auto; r: 0px; resize: none; right: auto; rotate: none; row-gap: normal; rx: auto; ry: auto; scale: none; scroll-behavior: auto; scroll-margin-block: 0px; scroll-margin-bottom: 0px; scroll-margin-inline: 0px; scroll-margin-left: 0px; scroll-margin-right: 0px; scroll-margin-top: 0px; scroll-padding-block: auto; scroll-padding-bottom: auto; scroll-padding-inline: auto; scroll-padding-left: auto; scroll-padding-right: auto; scroll-padding-top: auto; scroll-snap-align: none; scroll-snap-stop: normal; scroll-snap-type: none; shape-image-threshold: 0; shape-margin: 0px; shape-outside: none; shape-rendering: auto; size: ; speak-as: normal; stop-color: rgb(0, 0, 0); stop-opacity: 1; stroke: none; stroke-color: rgba(0, 0, 0, 0); stroke-dasharray: none; stroke-dashoffset: 0px; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 4; stroke-opacity: 1; stroke-width: 1px; tab-size: 8; table-layout: auto; text-align: start; text-anchor: start; text-decoration: none; text-decoration-color: rgb(255, 0, 0); text-decoration-line: none; text-decoration-skip: auto; text-decoration-style: solid; text-decoration-thickness: auto; text-indent: 0px; text-orientation: mixed; text-overflow: clip; text-rendering: auto; text-shadow: none; text-transform: none; text-underline-offset: auto; text-underline-position: auto; top: auto; touch-action: auto; transform: none; transform-box: view-box; transform-origin-x: ; transform-origin-y: ; transform-origin-z: ; transform-style: flat; transition-delay: 0s; transition-duration: 0s; transition-property: all; transition-timing-function: ease; translate: none; unicode-bidi: normal; vector-effect: none; vertical-align: baseline; visibility: visible; white-space: normal; widows: auto; width: 784px; will-change: auto; word-break: normal; word-spacing: 0px; word-wrap: normal; writing-mode: horizontal-tb; x: 0px; y: 0px; z-index: auto; zoom: 1; -apple-color-filter: none; -apple-pay-button-style: black; -apple-pay-button-type: plain; -apple-trailing-word: auto; -webkit-appearance: none; -webkit-backdrop-filter: none; -webkit-backface-visibility: visible; -webkit-background-clip: border-box; -webkit-background-composite: source-over; -webkit-background-origin: padding-box; -webkit-background-size: auto; -webkit-border-fit: border; -webkit-border-horizontal-spacing: 0px; -webkit-border-image: none; -webkit-border-vertical-spacing: 0px; -webkit-box-align: stretch; -webkit-box-decoration-break: slice; -webkit-box-direction: normal; -webkit-box-flex: 0; -webkit-box-flex-group: 1; -webkit-box-lines: single; -webkit-box-ordinal-group: 1; -webkit-box-orient: horizontal; -webkit-box-pack: start; -webkit-box-reflect: none; -webkit-box-shadow: none; -webkit-column-axis: auto; -webkit-column-break-after: auto; -webkit-column-break-before: auto; -webkit-column-break-inside: auto; -webkit-column-progression: normal; -webkit-cursor-visibility: auto; -webkit-font-kerning: auto; -webkit-font-smoothing: auto; -webkit-hyphenate-character: auto; -webkit-hyphenate-limit-after: auto; -webkit-hyphenate-limit-before: auto; -webkit-hyphenate-limit-lines: no-limit; -webkit-hyphens: manual; -webkit-initial-letter: normal; -webkit-line-align: none; -webkit-line-box-contain: block inline replaced; -webkit-line-clamp: none; -webkit-line-grid: none; -webkit-line-snap: none; -webkit-locale: auto; -webkit-margin-after-collapse: collapse; -webkit-margin-before-collapse: collapse; -webkit-margin-bottom-collapse: collapse; -webkit-margin-top-collapse: collapse; -webkit-mask-box-image: none; -webkit-mask-box-image-outset: 0; -webkit-mask-box-image-repeat: stretch; -webkit-mask-box-image-slice: 0 fill; -webkit-mask-box-image-source: none; -webkit-mask-box-image-width: auto; -webkit-mask-clip: border-box; -webkit-mask-composite: source-over; -webkit-mask-image: none; -webkit-mask-origin: border-box; -webkit-mask-position-x: 0%; -webkit-mask-position-y: 0%; -webkit-mask-repeat: repeat; -webkit-mask-size: auto; -webkit-mask-source-type: alpha; -webkit-nbsp-mode: normal; -webkit-print-color-adjust: economy; -webkit-rtl-ordering: logical; -webkit-ruby-position: before; -webkit-text-combine: none; -webkit-text-emphasis-color: rgb(255, 0, 0); -webkit-text-emphasis-position: over right; -webkit-text-emphasis-style: none; -webkit-text-fill-color: rgb(255, 0, 0); -webkit-text-orientation: mixed; -webkit-text-security: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-color: rgb(255, 0, 0); -webkit-text-stroke-width: 0px; -webkit-text-zoom: normal; -webkit-transform-style: flat; -webkit-user-drag: auto; -webkit-user-modify: read-only; -webkit-user-select: text;"
> 
>diff --git a/LayoutTests/platform/gtk/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt b/LayoutTests/platform/gtk/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>index 5ce6d68a32515fecd941ccb4537b749b575dc765..440903cc7bb08a578561c3ba106b088c298c67ba 100644
>--- a/LayoutTests/platform/gtk/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>+++ b/LayoutTests/platform/gtk/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>@@ -7,5 +7,5 @@ PASS cssText order
> PASS another cssText order (non-alphabetical order)
> PASS whitespaces in value
> PASS invalid property does not appear
>-FAIL cssText on computed style declaration returns the empty string assert_equals: cssText is empty expected "" but got "align-content: normal; align-items: normal; align-self: auto; alignment-baseline: auto; all: ; alt: \"\"; animation-delay: 0s; animation-direction: normal; animation-duration: 0s; animation-fill-mode: none; animation-iteration-count: 1; animation-name: none; animation-play-state: running; animation-timing-function: ease; aspect-ratio: auto; background-attachment: scroll; background-blend-mode: normal; background-clip: border-box; background-color: rgba(0, 0, 0, 0); background-image: none; background-origin: padding-box; background-position-x: 0%; background-position-y: 0%; background-repeat: repeat; background-size: auto; baseline-shift: baseline; block-size: 0px; border-block-end-color: rgb(255, 0, 0); border-block-end-style: none; border-block-end-width: 0px; border-block-start-color: rgb(255, 0, 0); border-block-start-style: none; border-block-start-width: 0px; border-bottom-color: rgb(255, 0, 0); border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-bottom-style: none; border-bottom-width: 0px; border-collapse: separate; border-end-end-radius: 0px; border-end-start-radius: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-inline-end-color: rgb(255, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(255, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(255, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(255, 0, 0); border-right-style: none; border-right-width: 0px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-color: rgb(255, 0, 0); border-top-left-radius: 0px; border-top-right-radius: 0px; border-top-style: none; border-top-width: 0px; bottom: auto; box-shadow: none; box-sizing: content-box; break-after: auto; break-before: auto; break-inside: auto; buffered-rendering: auto; caption-side: top; caret-color: rgb(255, 0, 0); clear: none; clip: auto; clip-path: none; clip-rule: nonzero; color: rgb(255, 0, 0); color-interpolation: sRGB; color-interpolation-filters: linearRGB; color-rendering: auto; color-scheme: auto; column-count: auto; column-fill: balance; column-gap: normal; column-rule-color: rgb(255, 0, 0); column-rule-style: none; column-rule-width: 0px; column-span: none; column-width: auto; content: ; counter-increment: none; counter-reset: none; cursor: auto; cx: 0px; cy: 0px; direction: ltr; display: block; dominant-baseline: auto; empty-cells: show; fill: rgb(0, 0, 0); fill-opacity: 1; fill-rule: nonzero; filter: none; flex-basis: auto; flex-direction: row; flex-grow: 0; flex-shrink: 1; flex-wrap: nowrap; float: none; flood-color: rgb(0, 0, 0); flood-opacity: 1; font-family: -webkit-standard; font-feature-settings: normal; font-optical-sizing: auto; font-size: 13.333333015441895px; font-stretch: normal; font-style: normal; font-synthesis: style weight small-caps; font-variant-alternates: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-ligatures: normal; font-variant-numeric: normal; font-variant-position: normal; font-variation-settings: normal; font-weight: normal; glyph-orientation-horizontal: 0deg; glyph-orientation-vertical: auto; grid-auto-columns: auto; grid-auto-flow: row; grid-auto-rows: auto; grid-column-end: auto; grid-column-start: auto; grid-row-end: auto; grid-row-start: auto; grid-template-areas: none; grid-template-columns: none; grid-template-rows: none; hanging-punctuation: none; height: 0px; image-orientation: from-image; image-rendering: auto; inline-size: 784px; inset-block-end: auto; inset-block-start: auto; inset-inline-end: auto; inset-inline-start: auto; isolation: auto; justify-content: normal; justify-items: normal; justify-self: auto; kerning: 0; left: auto; letter-spacing: normal; lighting-color: rgb(255, 255, 255); line-break: auto; line-height: normal; list-style-image: none; list-style-position: outside; list-style-type: disc; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; marker-end: none; marker-mid: none; marker-start: none; mask: none; mask-type: luminance; math-style: normal; max-block-size: none; max-height: none; max-inline-size: none; max-width: none; min-block-size: 0px; min-height: 0px; min-inline-size: 0px; min-width: 0px; mix-blend-mode: normal; object-fit: fill; object-position: 50% 50%; opacity: 1; order: 0; orphans: auto; outline-color: rgb(255, 0, 0); outline-offset: 0px; outline-style: none; outline-width: 0px; overflow-wrap: normal; overflow-x: visible; overflow-y: visible; overscroll-behavior-x: auto; overscroll-behavior-y: auto; padding-block-end: 0px; padding-block-start: 0px; padding-bottom: 0px; padding-inline-end: 0px; padding-inline-start: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; page-break-after: auto; page-break-before: auto; page-break-inside: auto; paint-order: normal; perspective: none; perspective-origin-x: ; perspective-origin-y: ; pointer-events: auto; position: static; quotes: auto; r: 0px; resize: none; right: auto; rotate: none; row-gap: normal; rx: auto; ry: auto; scale: none; scroll-behavior: auto; scroll-margin-block: 0px; scroll-margin-bottom: 0px; scroll-margin-inline: 0px; scroll-margin-left: 0px; scroll-margin-right: 0px; scroll-margin-top: 0px; scroll-padding-block: auto; scroll-padding-bottom: auto; scroll-padding-inline: auto; scroll-padding-left: auto; scroll-padding-right: auto; scroll-padding-top: auto; scroll-snap-align: none; scroll-snap-stop: normal; scroll-snap-type: none; shape-image-threshold: 0; shape-margin: 0px; shape-outside: none; shape-rendering: auto; size: ; speak-as: normal; stop-color: rgb(0, 0, 0); stop-opacity: 1; stroke: none; stroke-color: rgba(0, 0, 0, 0); stroke-dasharray: none; stroke-dashoffset: 0px; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 4; stroke-opacity: 1; stroke-width: 1px; tab-size: 8; table-layout: auto; text-align: start; text-anchor: start; text-decoration: none; text-decoration-color: rgb(255, 0, 0); text-decoration-line: none; text-decoration-skip: auto; text-decoration-style: solid; text-decoration-thickness: auto; text-indent: 0px; text-orientation: mixed; text-overflow: clip; text-rendering: auto; text-shadow: none; text-transform: none; text-underline-offset: auto; text-underline-position: auto; top: auto; touch-action: auto; transform: none; transform-box: view-box; transform-origin-x: ; transform-origin-y: ; transform-origin-z: ; transform-style: flat; transition-delay: 0s; transition-duration: 0s; transition-property: all; transition-timing-function: ease; translate: none; unicode-bidi: normal; vector-effect: none; vertical-align: baseline; visibility: visible; white-space: normal; widows: auto; width: 784px; will-change: auto; word-break: normal; word-spacing: 0px; word-wrap: normal; writing-mode: horizontal-tb; x: 0px; y: 0px; z-index: auto; zoom: 1; -apple-color-filter: none; -webkit-appearance: none; -webkit-backdrop-filter: none; -webkit-backface-visibility: visible; -webkit-background-clip: border-box; -webkit-background-composite: source-over; -webkit-background-origin: padding-box; -webkit-background-size: auto; -webkit-border-fit: border; -webkit-border-horizontal-spacing: 0px; -webkit-border-image: none; -webkit-border-vertical-spacing: 0px; -webkit-box-align: stretch; -webkit-box-decoration-break: slice; -webkit-box-direction: normal; -webkit-box-flex: 0; -webkit-box-flex-group: 1; -webkit-box-lines: single; -webkit-box-ordinal-group: 1; -webkit-box-orient: horizontal; -webkit-box-pack: start; -webkit-box-reflect: none; -webkit-box-shadow: none; -webkit-column-axis: auto; -webkit-column-break-after: auto; -webkit-column-break-before: auto; -webkit-column-break-inside: auto; -webkit-column-progression: normal; -webkit-cursor-visibility: auto; -webkit-font-kerning: auto; -webkit-font-smoothing: auto; -webkit-hyphenate-character: auto; -webkit-hyphenate-limit-after: auto; -webkit-hyphenate-limit-before: auto; -webkit-hyphenate-limit-lines: no-limit; -webkit-hyphens: manual; -webkit-initial-letter: normal; -webkit-line-align: none; -webkit-line-box-contain: block inline replaced; -webkit-line-clamp: none; -webkit-line-grid: none; -webkit-line-snap: none; -webkit-locale: auto; -webkit-margin-after-collapse: collapse; -webkit-margin-before-collapse: collapse; -webkit-margin-bottom-collapse: collapse; -webkit-margin-top-collapse: collapse; -webkit-mask-box-image: none; -webkit-mask-box-image-outset: 0; -webkit-mask-box-image-repeat: stretch; -webkit-mask-box-image-slice: 0 fill; -webkit-mask-box-image-source: none; -webkit-mask-box-image-width: auto; -webkit-mask-clip: border-box; -webkit-mask-composite: source-over; -webkit-mask-image: none; -webkit-mask-origin: border-box; -webkit-mask-position-x: 0%; -webkit-mask-position-y: 0%; -webkit-mask-repeat: repeat; -webkit-mask-size: auto; -webkit-mask-source-type: alpha; -webkit-nbsp-mode: normal; -webkit-print-color-adjust: economy; -webkit-rtl-ordering: logical; -webkit-ruby-position: before; -webkit-tap-highlight-color: rgba(0, 0, 0, 0.4); -webkit-text-combine: none; -webkit-text-emphasis-color: rgb(255, 0, 0); -webkit-text-emphasis-position: over right; -webkit-text-emphasis-style: none; -webkit-text-fill-color: rgb(255, 0, 0); -webkit-text-orientation: mixed; -webkit-text-security: none; -webkit-text-stroke-color: rgb(255, 0, 0); -webkit-text-stroke-width: 0px; -webkit-text-zoom: normal; -webkit-transform-style: flat; -webkit-user-drag: auto; -webkit-user-modify: read-only; -webkit-user-select: text;"
>+FAIL cssText on computed style declaration returns the empty string assert_equals: cssText is empty expected "" but got "align-content: normal; align-items: normal; align-self: auto; alignment-baseline: auto; all: ; alt: \"\"; animation-delay: 0s; animation-direction: normal; animation-duration: 0s; animation-fill-mode: none; animation-iteration-count: 1; animation-name: none; animation-play-state: running; animation-timing-function: ease; aspect-ratio: auto; background-attachment: scroll; background-blend-mode: normal; background-clip: border-box; background-color: rgba(0, 0, 0, 0); background-image: none; background-origin: padding-box; background-position-x: 0%; background-position-y: 0%; background-repeat: repeat; background-size: auto; baseline-shift: baseline; block-size: 0px; border-block-end-color: rgb(255, 0, 0); border-block-end-style: none; border-block-end-width: 0px; border-block-start-color: rgb(255, 0, 0); border-block-start-style: none; border-block-start-width: 0px; border-bottom-color: rgb(255, 0, 0); border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-bottom-style: none; border-bottom-width: 0px; border-collapse: separate; border-end-end-radius: 0px; border-end-start-radius: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-inline-end-color: rgb(255, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(255, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(255, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(255, 0, 0); border-right-style: none; border-right-width: 0px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-color: rgb(255, 0, 0); border-top-left-radius: 0px; border-top-right-radius: 0px; border-top-style: none; border-top-width: 0px; bottom: auto; box-shadow: none; box-sizing: content-box; break-after: auto; break-before: auto; break-inside: auto; buffered-rendering: auto; caption-side: top; caret-color: rgb(255, 0, 0); clear: none; clip: auto; clip-path: none; clip-rule: nonzero; color: rgb(255, 0, 0); color-interpolation: sRGB; color-interpolation-filters: linearRGB; color-rendering: auto; color-scheme: auto; column-count: auto; column-fill: balance; column-gap: normal; column-rule-color: rgb(255, 0, 0); column-rule-style: none; column-rule-width: 0px; column-span: none; column-width: auto; contain: none; content: ; counter-increment: none; counter-reset: none; cursor: auto; cx: 0px; cy: 0px; direction: ltr; display: block; dominant-baseline: auto; empty-cells: show; fill: rgb(0, 0, 0); fill-opacity: 1; fill-rule: nonzero; filter: none; flex-basis: auto; flex-direction: row; flex-grow: 0; flex-shrink: 1; flex-wrap: nowrap; float: none; flood-color: rgb(0, 0, 0); flood-opacity: 1; font-family: -webkit-standard; font-feature-settings: normal; font-optical-sizing: auto; font-size: 13.333333015441895px; font-stretch: normal; font-style: normal; font-synthesis: style weight small-caps; font-variant-alternates: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-ligatures: normal; font-variant-numeric: normal; font-variant-position: normal; font-variation-settings: normal; font-weight: normal; glyph-orientation-horizontal: 0deg; glyph-orientation-vertical: auto; grid-auto-columns: auto; grid-auto-flow: row; grid-auto-rows: auto; grid-column-end: auto; grid-column-start: auto; grid-row-end: auto; grid-row-start: auto; grid-template-areas: none; grid-template-columns: none; grid-template-rows: none; hanging-punctuation: none; height: 0px; image-orientation: from-image; image-rendering: auto; inline-size: 784px; inset-block-end: auto; inset-block-start: auto; inset-inline-end: auto; inset-inline-start: auto; isolation: auto; justify-content: normal; justify-items: normal; justify-self: auto; kerning: 0; left: auto; letter-spacing: normal; lighting-color: rgb(255, 255, 255); line-break: auto; line-height: normal; list-style-image: none; list-style-position: outside; list-style-type: disc; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; marker-end: none; marker-mid: none; marker-start: none; mask: none; mask-type: luminance; math-style: normal; max-block-size: none; max-height: none; max-inline-size: none; max-width: none; min-block-size: 0px; min-height: 0px; min-inline-size: 0px; min-width: 0px; mix-blend-mode: normal; object-fit: fill; object-position: 50% 50%; opacity: 1; order: 0; orphans: auto; outline-color: rgb(255, 0, 0); outline-offset: 0px; outline-style: none; outline-width: 0px; overflow-wrap: normal; overflow-x: visible; overflow-y: visible; overscroll-behavior-x: auto; overscroll-behavior-y: auto; padding-block-end: 0px; padding-block-start: 0px; padding-bottom: 0px; padding-inline-end: 0px; padding-inline-start: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; page-break-after: auto; page-break-before: auto; page-break-inside: auto; paint-order: normal; perspective: none; perspective-origin-x: ; perspective-origin-y: ; pointer-events: auto; position: static; quotes: auto; r: 0px; resize: none; right: auto; rotate: none; row-gap: normal; rx: auto; ry: auto; scale: none; scroll-behavior: auto; scroll-margin-block: 0px; scroll-margin-bottom: 0px; scroll-margin-inline: 0px; scroll-margin-left: 0px; scroll-margin-right: 0px; scroll-margin-top: 0px; scroll-padding-block: auto; scroll-padding-bottom: auto; scroll-padding-inline: auto; scroll-padding-left: auto; scroll-padding-right: auto; scroll-padding-top: auto; scroll-snap-align: none; scroll-snap-stop: normal; scroll-snap-type: none; shape-image-threshold: 0; shape-margin: 0px; shape-outside: none; shape-rendering: auto; size: ; speak-as: normal; stop-color: rgb(0, 0, 0); stop-opacity: 1; stroke: none; stroke-color: rgba(0, 0, 0, 0); stroke-dasharray: none; stroke-dashoffset: 0px; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 4; stroke-opacity: 1; stroke-width: 1px; tab-size: 8; table-layout: auto; text-align: start; text-anchor: start; text-decoration: none; text-decoration-color: rgb(255, 0, 0); text-decoration-line: none; text-decoration-skip: auto; text-decoration-style: solid; text-decoration-thickness: auto; text-indent: 0px; text-orientation: mixed; text-overflow: clip; text-rendering: auto; text-shadow: none; text-transform: none; text-underline-offset: auto; text-underline-position: auto; top: auto; touch-action: auto; transform: none; transform-box: view-box; transform-origin-x: ; transform-origin-y: ; transform-origin-z: ; transform-style: flat; transition-delay: 0s; transition-duration: 0s; transition-property: all; transition-timing-function: ease; translate: none; unicode-bidi: normal; vector-effect: none; vertical-align: baseline; visibility: visible; white-space: normal; widows: auto; width: 784px; will-change: auto; word-break: normal; word-spacing: 0px; word-wrap: normal; writing-mode: horizontal-tb; x: 0px; y: 0px; z-index: auto; zoom: 1; -apple-color-filter: none; -webkit-appearance: none; -webkit-backdrop-filter: none; -webkit-backface-visibility: visible; -webkit-background-clip: border-box; -webkit-background-composite: source-over; -webkit-background-origin: padding-box; -webkit-background-size: auto; -webkit-border-fit: border; -webkit-border-horizontal-spacing: 0px; -webkit-border-image: none; -webkit-border-vertical-spacing: 0px; -webkit-box-align: stretch; -webkit-box-decoration-break: slice; -webkit-box-direction: normal; -webkit-box-flex: 0; -webkit-box-flex-group: 1; -webkit-box-lines: single; -webkit-box-ordinal-group: 1; -webkit-box-orient: horizontal; -webkit-box-pack: start; -webkit-box-reflect: none; -webkit-box-shadow: none; -webkit-column-axis: auto; -webkit-column-break-after: auto; -webkit-column-break-before: auto; -webkit-column-break-inside: auto; -webkit-column-progression: normal; -webkit-cursor-visibility: auto; -webkit-font-kerning: auto; -webkit-font-smoothing: auto; -webkit-hyphenate-character: auto; -webkit-hyphenate-limit-after: auto; -webkit-hyphenate-limit-before: auto; -webkit-hyphenate-limit-lines: no-limit; -webkit-hyphens: manual; -webkit-initial-letter: normal; -webkit-line-align: none; -webkit-line-box-contain: block inline replaced; -webkit-line-clamp: none; -webkit-line-grid: none; -webkit-line-snap: none; -webkit-locale: auto; -webkit-margin-after-collapse: collapse; -webkit-margin-before-collapse: collapse; -webkit-margin-bottom-collapse: collapse; -webkit-margin-top-collapse: collapse; -webkit-mask-box-image: none; -webkit-mask-box-image-outset: 0; -webkit-mask-box-image-repeat: stretch; -webkit-mask-box-image-slice: 0 fill; -webkit-mask-box-image-source: none; -webkit-mask-box-image-width: auto; -webkit-mask-clip: border-box; -webkit-mask-composite: source-over; -webkit-mask-image: none; -webkit-mask-origin: border-box; -webkit-mask-position-x: 0%; -webkit-mask-position-y: 0%; -webkit-mask-repeat: repeat; -webkit-mask-size: auto; -webkit-mask-source-type: alpha; -webkit-nbsp-mode: normal; -webkit-print-color-adjust: economy; -webkit-rtl-ordering: logical; -webkit-ruby-position: before; -webkit-tap-highlight-color: rgba(0, 0, 0, 0.4); -webkit-text-combine: none; -webkit-text-emphasis-color: rgb(255, 0, 0); -webkit-text-emphasis-position: over right; -webkit-text-emphasis-style: none; -webkit-text-fill-color: rgb(255, 0, 0); -webkit-text-orientation: mixed; -webkit-text-security: none; -webkit-text-stroke-color: rgb(255, 0, 0); -webkit-text-stroke-width: 0px; -webkit-text-zoom: normal; -webkit-transform-style: flat; -webkit-user-drag: auto; -webkit-user-modify: read-only; -webkit-user-select: text;"
> 
>diff --git a/LayoutTests/platform/ios-wk2/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt b/LayoutTests/platform/ios-wk2/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>index 3be3e298afd054dc3802eceb51f1f50effc7d7d3..b9a96c3ceffbb44a4e2fa3a5283b2e32b3496853 100644
>--- a/LayoutTests/platform/ios-wk2/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>+++ b/LayoutTests/platform/ios-wk2/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>@@ -7,5 +7,5 @@ PASS cssText order
> PASS another cssText order (non-alphabetical order)
> PASS whitespaces in value
> PASS invalid property does not appear
>-FAIL cssText on computed style declaration returns the empty string assert_equals: cssText is empty expected "" but got "align-content: normal; align-items: normal; align-self: auto; alignment-baseline: auto; all: ; alt: \"\"; animation-delay: 0s; animation-direction: normal; animation-duration: 0s; animation-fill-mode: none; animation-iteration-count: 1; animation-name: none; animation-play-state: running; animation-timing-function: ease; aspect-ratio: auto; background-attachment: scroll; background-blend-mode: normal; background-clip: border-box; background-color: rgba(0, 0, 0, 0); background-image: none; background-origin: padding-box; background-position-x: 0%; background-position-y: 0%; background-repeat: repeat; background-size: auto; baseline-shift: baseline; block-size: 0px; border-block-end-color: rgb(255, 0, 0); border-block-end-style: none; border-block-end-width: 0px; border-block-start-color: rgb(255, 0, 0); border-block-start-style: none; border-block-start-width: 0px; border-bottom-color: rgb(255, 0, 0); border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-bottom-style: none; border-bottom-width: 0px; border-collapse: separate; border-end-end-radius: 0px; border-end-start-radius: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-inline-end-color: rgb(255, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(255, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(255, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(255, 0, 0); border-right-style: none; border-right-width: 0px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-color: rgb(255, 0, 0); border-top-left-radius: 0px; border-top-right-radius: 0px; border-top-style: none; border-top-width: 0px; bottom: auto; box-shadow: none; box-sizing: content-box; break-after: auto; break-before: auto; break-inside: auto; buffered-rendering: auto; caption-side: top; caret-color: rgb(255, 0, 0); clear: none; clip: auto; clip-path: none; clip-rule: nonzero; color: rgb(255, 0, 0); color-interpolation: sRGB; color-interpolation-filters: linearRGB; color-rendering: auto; color-scheme: auto; column-count: auto; column-fill: balance; column-gap: normal; column-rule-color: rgb(255, 0, 0); column-rule-style: none; column-rule-width: 0px; column-span: none; column-width: auto; content: ; counter-increment: none; counter-reset: none; cursor: auto; cx: 0px; cy: 0px; direction: ltr; display: block; dominant-baseline: auto; empty-cells: show; fill: rgb(0, 0, 0); fill-opacity: 1; fill-rule: nonzero; filter: none; flex-basis: auto; flex-direction: row; flex-grow: 0; flex-shrink: 1; flex-wrap: nowrap; float: none; flood-color: rgb(0, 0, 0); flood-opacity: 1; font-family: -webkit-standard; font-feature-settings: normal; font-optical-sizing: auto; font-size: 13.333333015441895px; font-stretch: normal; font-style: normal; font-synthesis: style weight small-caps; font-variant-alternates: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-ligatures: normal; font-variant-numeric: normal; font-variant-position: normal; font-variation-settings: normal; font-weight: normal; glyph-orientation-horizontal: 0deg; glyph-orientation-vertical: auto; grid-auto-columns: auto; grid-auto-flow: row; grid-auto-rows: auto; grid-column-end: auto; grid-column-start: auto; grid-row-end: auto; grid-row-start: auto; grid-template-areas: none; grid-template-columns: none; grid-template-rows: none; hanging-punctuation: none; height: 0px; image-orientation: from-image; image-rendering: auto; inline-size: 784px; inset-block-end: auto; inset-block-start: auto; inset-inline-end: auto; inset-inline-start: auto; isolation: auto; justify-content: normal; justify-items: normal; justify-self: auto; kerning: 0; left: auto; letter-spacing: normal; lighting-color: rgb(255, 255, 255); line-break: auto; line-height: normal; list-style-image: none; list-style-position: outside; list-style-type: disc; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; marker-end: none; marker-mid: none; marker-start: none; mask: none; mask-type: luminance; math-style: normal; max-block-size: none; max-height: none; max-inline-size: none; max-width: none; min-block-size: 0px; min-height: 0px; min-inline-size: 0px; min-width: 0px; mix-blend-mode: normal; object-fit: fill; object-position: 50% 50%; opacity: 1; order: 0; orphans: auto; outline-color: rgb(255, 0, 0); outline-offset: 0px; outline-style: none; outline-width: 0px; overflow-wrap: normal; overflow-x: visible; overflow-y: visible; overscroll-behavior-x: auto; overscroll-behavior-y: auto; padding-block-end: 0px; padding-block-start: 0px; padding-bottom: 0px; padding-inline-end: 0px; padding-inline-start: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; page-break-after: auto; page-break-before: auto; page-break-inside: auto; paint-order: normal; perspective: none; perspective-origin-x: ; perspective-origin-y: ; pointer-events: auto; position: static; quotes: auto; r: 0px; resize: none; right: auto; rotate: none; row-gap: normal; rx: auto; ry: auto; scale: none; scroll-behavior: auto; scroll-margin-block: 0px; scroll-margin-bottom: 0px; scroll-margin-inline: 0px; scroll-margin-left: 0px; scroll-margin-right: 0px; scroll-margin-top: 0px; scroll-padding-block: auto; scroll-padding-bottom: auto; scroll-padding-inline: auto; scroll-padding-left: auto; scroll-padding-right: auto; scroll-padding-top: auto; scroll-snap-align: none; scroll-snap-stop: normal; scroll-snap-type: none; shape-image-threshold: 0; shape-margin: 0px; shape-outside: none; shape-rendering: auto; size: ; speak-as: normal; stop-color: rgb(0, 0, 0); stop-opacity: 1; stroke: none; stroke-color: rgba(0, 0, 0, 0); stroke-dasharray: none; stroke-dashoffset: 0px; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 4; stroke-opacity: 1; stroke-width: 1px; tab-size: 8; table-layout: auto; text-align: start; text-anchor: start; text-decoration: none; text-decoration-color: rgb(255, 0, 0); text-decoration-line: none; text-decoration-skip: auto; text-decoration-style: solid; text-decoration-thickness: auto; text-indent: 0px; text-orientation: mixed; text-overflow: clip; text-rendering: auto; text-shadow: none; text-transform: none; text-underline-offset: auto; text-underline-position: auto; top: auto; touch-action: auto; transform: none; transform-box: view-box; transform-origin-x: ; transform-origin-y: ; transform-origin-z: ; transform-style: flat; transition-delay: 0s; transition-duration: 0s; transition-property: all; transition-timing-function: ease; translate: none; unicode-bidi: normal; vector-effect: none; vertical-align: baseline; visibility: visible; white-space: normal; widows: auto; width: 784px; will-change: auto; word-break: normal; word-spacing: 0px; word-wrap: normal; writing-mode: horizontal-tb; x: 0px; y: 0px; z-index: auto; zoom: 1; -apple-color-filter: none; -apple-pay-button-style: black; -apple-pay-button-type: plain; -apple-trailing-word: auto; -webkit-appearance: none; -webkit-backdrop-filter: none; -webkit-backface-visibility: visible; -webkit-background-clip: border-box; -webkit-background-composite: source-over; -webkit-background-origin: padding-box; -webkit-background-size: auto; -webkit-border-fit: border; -webkit-border-horizontal-spacing: 0px; -webkit-border-image: none; -webkit-border-vertical-spacing: 0px; -webkit-box-align: stretch; -webkit-box-decoration-break: slice; -webkit-box-direction: normal; -webkit-box-flex: 0; -webkit-box-flex-group: 1; -webkit-box-lines: single; -webkit-box-ordinal-group: 1; -webkit-box-orient: horizontal; -webkit-box-pack: start; -webkit-box-reflect: none; -webkit-box-shadow: none; -webkit-column-axis: auto; -webkit-column-break-after: auto; -webkit-column-break-before: auto; -webkit-column-break-inside: auto; -webkit-column-progression: normal; -webkit-cursor-visibility: auto; -webkit-font-kerning: auto; -webkit-font-smoothing: auto; -webkit-hyphenate-character: auto; -webkit-hyphenate-limit-after: auto; -webkit-hyphenate-limit-before: auto; -webkit-hyphenate-limit-lines: no-limit; -webkit-hyphens: manual; -webkit-initial-letter: normal; -webkit-line-align: none; -webkit-line-box-contain: block inline replaced; -webkit-line-clamp: none; -webkit-line-grid: none; -webkit-line-snap: none; -webkit-locale: auto; -webkit-margin-after-collapse: collapse; -webkit-margin-before-collapse: collapse; -webkit-margin-bottom-collapse: collapse; -webkit-margin-top-collapse: collapse; -webkit-mask-box-image: none; -webkit-mask-box-image-outset: 0; -webkit-mask-box-image-repeat: stretch; -webkit-mask-box-image-slice: 0 fill; -webkit-mask-box-image-source: none; -webkit-mask-box-image-width: auto; -webkit-mask-clip: border-box; -webkit-mask-composite: source-over; -webkit-mask-image: none; -webkit-mask-origin: border-box; -webkit-mask-position-x: 0%; -webkit-mask-position-y: 0%; -webkit-mask-repeat: repeat; -webkit-mask-size: auto; -webkit-mask-source-type: alpha; -webkit-nbsp-mode: normal; -webkit-overflow-scrolling: auto; -webkit-print-color-adjust: economy; -webkit-rtl-ordering: logical; -webkit-ruby-position: before; -webkit-text-combine: none; -webkit-text-emphasis-color: rgb(255, 0, 0); -webkit-text-emphasis-position: over right; -webkit-text-emphasis-style: none; -webkit-text-fill-color: rgb(255, 0, 0); -webkit-text-orientation: mixed; -webkit-text-security: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-color: rgb(255, 0, 0); -webkit-text-stroke-width: 0px; -webkit-text-zoom: normal; -webkit-touch-callout: default; -webkit-transform-style: flat; -webkit-user-drag: auto; -webkit-user-modify: read-only; -webkit-user-select: text;"
>+FAIL cssText on computed style declaration returns the empty string assert_equals: cssText is empty expected "" but got "align-content: normal; align-items: normal; align-self: auto; alignment-baseline: auto; all: ; alt: \"\"; animation-delay: 0s; animation-direction: normal; animation-duration: 0s; animation-fill-mode: none; animation-iteration-count: 1; animation-name: none; animation-play-state: running; animation-timing-function: ease; aspect-ratio: auto; background-attachment: scroll; background-blend-mode: normal; background-clip: border-box; background-color: rgba(0, 0, 0, 0); background-image: none; background-origin: padding-box; background-position-x: 0%; background-position-y: 0%; background-repeat: repeat; background-size: auto; baseline-shift: baseline; block-size: 0px; border-block-end-color: rgb(255, 0, 0); border-block-end-style: none; border-block-end-width: 0px; border-block-start-color: rgb(255, 0, 0); border-block-start-style: none; border-block-start-width: 0px; border-bottom-color: rgb(255, 0, 0); border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-bottom-style: none; border-bottom-width: 0px; border-collapse: separate; border-end-end-radius: 0px; border-end-start-radius: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-inline-end-color: rgb(255, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(255, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(255, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(255, 0, 0); border-right-style: none; border-right-width: 0px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-color: rgb(255, 0, 0); border-top-left-radius: 0px; border-top-right-radius: 0px; border-top-style: none; border-top-width: 0px; bottom: auto; box-shadow: none; box-sizing: content-box; break-after: auto; break-before: auto; break-inside: auto; buffered-rendering: auto; caption-side: top; caret-color: rgb(255, 0, 0); clear: none; clip: auto; clip-path: none; clip-rule: nonzero; color: rgb(255, 0, 0); color-interpolation: sRGB; color-interpolation-filters: linearRGB; color-rendering: auto; color-scheme: auto; column-count: auto; column-fill: balance; column-gap: normal; column-rule-color: rgb(255, 0, 0); column-rule-style: none; column-rule-width: 0px; column-span: none; column-width: auto; contain: none; content: ; counter-increment: none; counter-reset: none; cursor: auto; cx: 0px; cy: 0px; direction: ltr; display: block; dominant-baseline: auto; empty-cells: show; fill: rgb(0, 0, 0); fill-opacity: 1; fill-rule: nonzero; filter: none; flex-basis: auto; flex-direction: row; flex-grow: 0; flex-shrink: 1; flex-wrap: nowrap; float: none; flood-color: rgb(0, 0, 0); flood-opacity: 1; font-family: -webkit-standard; font-feature-settings: normal; font-optical-sizing: auto; font-size: 13.333333015441895px; font-stretch: normal; font-style: normal; font-synthesis: style weight small-caps; font-variant-alternates: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-ligatures: normal; font-variant-numeric: normal; font-variant-position: normal; font-variation-settings: normal; font-weight: normal; glyph-orientation-horizontal: 0deg; glyph-orientation-vertical: auto; grid-auto-columns: auto; grid-auto-flow: row; grid-auto-rows: auto; grid-column-end: auto; grid-column-start: auto; grid-row-end: auto; grid-row-start: auto; grid-template-areas: none; grid-template-columns: none; grid-template-rows: none; hanging-punctuation: none; height: 0px; image-orientation: from-image; image-rendering: auto; inline-size: 784px; inset-block-end: auto; inset-block-start: auto; inset-inline-end: auto; inset-inline-start: auto; isolation: auto; justify-content: normal; justify-items: normal; justify-self: auto; kerning: 0; left: auto; letter-spacing: normal; lighting-color: rgb(255, 255, 255); line-break: auto; line-height: normal; list-style-image: none; list-style-position: outside; list-style-type: disc; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; marker-end: none; marker-mid: none; marker-start: none; mask: none; mask-type: luminance; math-style: normal; max-block-size: none; max-height: none; max-inline-size: none; max-width: none; min-block-size: 0px; min-height: 0px; min-inline-size: 0px; min-width: 0px; mix-blend-mode: normal; object-fit: fill; object-position: 50% 50%; opacity: 1; order: 0; orphans: auto; outline-color: rgb(255, 0, 0); outline-offset: 0px; outline-style: none; outline-width: 0px; overflow-wrap: normal; overflow-x: visible; overflow-y: visible; overscroll-behavior-x: auto; overscroll-behavior-y: auto; padding-block-end: 0px; padding-block-start: 0px; padding-bottom: 0px; padding-inline-end: 0px; padding-inline-start: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; page-break-after: auto; page-break-before: auto; page-break-inside: auto; paint-order: normal; perspective: none; perspective-origin-x: ; perspective-origin-y: ; pointer-events: auto; position: static; quotes: auto; r: 0px; resize: none; right: auto; rotate: none; row-gap: normal; rx: auto; ry: auto; scale: none; scroll-behavior: auto; scroll-margin-block: 0px; scroll-margin-bottom: 0px; scroll-margin-inline: 0px; scroll-margin-left: 0px; scroll-margin-right: 0px; scroll-margin-top: 0px; scroll-padding-block: auto; scroll-padding-bottom: auto; scroll-padding-inline: auto; scroll-padding-left: auto; scroll-padding-right: auto; scroll-padding-top: auto; scroll-snap-align: none; scroll-snap-stop: normal; scroll-snap-type: none; shape-image-threshold: 0; shape-margin: 0px; shape-outside: none; shape-rendering: auto; size: ; speak-as: normal; stop-color: rgb(0, 0, 0); stop-opacity: 1; stroke: none; stroke-color: rgba(0, 0, 0, 0); stroke-dasharray: none; stroke-dashoffset: 0px; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 4; stroke-opacity: 1; stroke-width: 1px; tab-size: 8; table-layout: auto; text-align: start; text-anchor: start; text-decoration: none; text-decoration-color: rgb(255, 0, 0); text-decoration-line: none; text-decoration-skip: auto; text-decoration-style: solid; text-decoration-thickness: auto; text-indent: 0px; text-orientation: mixed; text-overflow: clip; text-rendering: auto; text-shadow: none; text-transform: none; text-underline-offset: auto; text-underline-position: auto; top: auto; touch-action: auto; transform: none; transform-box: view-box; transform-origin-x: ; transform-origin-y: ; transform-origin-z: ; transform-style: flat; transition-delay: 0s; transition-duration: 0s; transition-property: all; transition-timing-function: ease; translate: none; unicode-bidi: normal; vector-effect: none; vertical-align: baseline; visibility: visible; white-space: normal; widows: auto; width: 784px; will-change: auto; word-break: normal; word-spacing: 0px; word-wrap: normal; writing-mode: horizontal-tb; x: 0px; y: 0px; z-index: auto; zoom: 1; -apple-color-filter: none; -apple-pay-button-style: black; -apple-pay-button-type: plain; -apple-trailing-word: auto; -webkit-appearance: none; -webkit-backdrop-filter: none; -webkit-backface-visibility: visible; -webkit-background-clip: border-box; -webkit-background-composite: source-over; -webkit-background-origin: padding-box; -webkit-background-size: auto; -webkit-border-fit: border; -webkit-border-horizontal-spacing: 0px; -webkit-border-image: none; -webkit-border-vertical-spacing: 0px; -webkit-box-align: stretch; -webkit-box-decoration-break: slice; -webkit-box-direction: normal; -webkit-box-flex: 0; -webkit-box-flex-group: 1; -webkit-box-lines: single; -webkit-box-ordinal-group: 1; -webkit-box-orient: horizontal; -webkit-box-pack: start; -webkit-box-reflect: none; -webkit-box-shadow: none; -webkit-column-axis: auto; -webkit-column-break-after: auto; -webkit-column-break-before: auto; -webkit-column-break-inside: auto; -webkit-column-progression: normal; -webkit-cursor-visibility: auto; -webkit-font-kerning: auto; -webkit-font-smoothing: auto; -webkit-hyphenate-character: auto; -webkit-hyphenate-limit-after: auto; -webkit-hyphenate-limit-before: auto; -webkit-hyphenate-limit-lines: no-limit; -webkit-hyphens: manual; -webkit-initial-letter: normal; -webkit-line-align: none; -webkit-line-box-contain: block inline replaced; -webkit-line-clamp: none; -webkit-line-grid: none; -webkit-line-snap: none; -webkit-locale: auto; -webkit-margin-after-collapse: collapse; -webkit-margin-before-collapse: collapse; -webkit-margin-bottom-collapse: collapse; -webkit-margin-top-collapse: collapse; -webkit-mask-box-image: none; -webkit-mask-box-image-outset: 0; -webkit-mask-box-image-repeat: stretch; -webkit-mask-box-image-slice: 0 fill; -webkit-mask-box-image-source: none; -webkit-mask-box-image-width: auto; -webkit-mask-clip: border-box; -webkit-mask-composite: source-over; -webkit-mask-image: none; -webkit-mask-origin: border-box; -webkit-mask-position-x: 0%; -webkit-mask-position-y: 0%; -webkit-mask-repeat: repeat; -webkit-mask-size: auto; -webkit-mask-source-type: alpha; -webkit-nbsp-mode: normal; -webkit-overflow-scrolling: auto; -webkit-print-color-adjust: economy; -webkit-rtl-ordering: logical; -webkit-ruby-position: before; -webkit-text-combine: none; -webkit-text-emphasis-color: rgb(255, 0, 0); -webkit-text-emphasis-position: over right; -webkit-text-emphasis-style: none; -webkit-text-fill-color: rgb(255, 0, 0); -webkit-text-orientation: mixed; -webkit-text-security: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-color: rgb(255, 0, 0); -webkit-text-stroke-width: 0px; -webkit-text-zoom: normal; -webkit-touch-callout: default; -webkit-transform-style: flat; -webkit-user-drag: auto; -webkit-user-modify: read-only; -webkit-user-select: text;"
> 
>diff --git a/LayoutTests/platform/wpe/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt b/LayoutTests/platform/wpe/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>index 2374ba1492ecba266a35376cbcfe47be2b2fed5b..9f739fd81da7396e6d0a2fa79b7c73bf683fe780 100644
>--- a/LayoutTests/platform/wpe/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>+++ b/LayoutTests/platform/wpe/imported/w3c/web-platform-tests/css/cssom/cssstyledeclaration-csstext-expected.txt
>@@ -7,5 +7,5 @@ PASS cssText order
> PASS another cssText order (non-alphabetical order)
> PASS whitespaces in value
> PASS invalid property does not appear
>-FAIL cssText on computed style declaration returns the empty string assert_equals: cssText is empty expected "" but got "align-content: normal; align-items: normal; align-self: auto; alignment-baseline: auto; all: ; alt: \"\"; animation-delay: 0s; animation-direction: normal; animation-duration: 0s; animation-fill-mode: none; animation-iteration-count: 1; animation-name: none; animation-play-state: running; animation-timing-function: ease; aspect-ratio: auto; background-attachment: scroll; background-blend-mode: normal; background-clip: border-box; background-color: rgba(0, 0, 0, 0); background-image: none; background-origin: padding-box; background-position-x: 0%; background-position-y: 0%; background-repeat: repeat; background-size: auto; baseline-shift: baseline; block-size: 0px; border-block-end-color: rgb(255, 0, 0); border-block-end-style: none; border-block-end-width: 0px; border-block-start-color: rgb(255, 0, 0); border-block-start-style: none; border-block-start-width: 0px; border-bottom-color: rgb(255, 0, 0); border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-bottom-style: none; border-bottom-width: 0px; border-collapse: separate; border-end-end-radius: 0px; border-end-start-radius: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-inline-end-color: rgb(255, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(255, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(255, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(255, 0, 0); border-right-style: none; border-right-width: 0px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-color: rgb(255, 0, 0); border-top-left-radius: 0px; border-top-right-radius: 0px; border-top-style: none; border-top-width: 0px; bottom: auto; box-shadow: none; box-sizing: content-box; break-after: auto; break-before: auto; break-inside: auto; buffered-rendering: auto; caption-side: top; caret-color: rgb(255, 0, 0); clear: none; clip: auto; clip-path: none; clip-rule: nonzero; color: rgb(255, 0, 0); color-interpolation: sRGB; color-interpolation-filters: linearRGB; color-rendering: auto; column-count: auto; column-fill: balance; column-gap: normal; column-rule-color: rgb(255, 0, 0); column-rule-style: none; column-rule-width: 0px; column-span: none; column-width: auto; content: ; counter-increment: none; counter-reset: none; cursor: auto; cx: 0px; cy: 0px; direction: ltr; display: block; dominant-baseline: auto; empty-cells: show; fill: rgb(0, 0, 0); fill-opacity: 1; fill-rule: nonzero; filter: none; flex-basis: auto; flex-direction: row; flex-grow: 0; flex-shrink: 1; flex-wrap: nowrap; float: none; flood-color: rgb(0, 0, 0); flood-opacity: 1; font-family: -webkit-standard; font-feature-settings: normal; font-optical-sizing: auto; font-size: 13.333333015441895px; font-stretch: normal; font-style: normal; font-synthesis: style weight small-caps; font-variant-alternates: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-ligatures: normal; font-variant-numeric: normal; font-variant-position: normal; font-variation-settings: normal; font-weight: normal; glyph-orientation-horizontal: 0deg; glyph-orientation-vertical: auto; grid-auto-columns: auto; grid-auto-flow: row; grid-auto-rows: auto; grid-column-end: auto; grid-column-start: auto; grid-row-end: auto; grid-row-start: auto; grid-template-areas: none; grid-template-columns: none; grid-template-rows: none; hanging-punctuation: none; height: 0px; image-orientation: from-image; image-rendering: auto; inline-size: 784px; inset-block-end: auto; inset-block-start: auto; inset-inline-end: auto; inset-inline-start: auto; isolation: auto; justify-content: normal; justify-items: normal; justify-self: auto; kerning: 0; left: auto; letter-spacing: normal; lighting-color: rgb(255, 255, 255); line-break: auto; line-height: normal; list-style-image: none; list-style-position: outside; list-style-type: disc; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; marker-end: none; marker-mid: none; marker-start: none; mask: none; mask-type: luminance; math-style: normal; max-block-size: none; max-height: none; max-inline-size: none; max-width: none; min-block-size: 0px; min-height: 0px; min-inline-size: 0px; min-width: 0px; mix-blend-mode: normal; object-fit: fill; object-position: 50% 50%; opacity: 1; order: 0; orphans: auto; outline-color: rgb(255, 0, 0); outline-offset: 0px; outline-style: none; outline-width: 0px; overflow-wrap: normal; overflow-x: visible; overflow-y: visible; overscroll-behavior-x: auto; overscroll-behavior-y: auto; padding-block-end: 0px; padding-block-start: 0px; padding-bottom: 0px; padding-inline-end: 0px; padding-inline-start: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; page-break-after: auto; page-break-before: auto; page-break-inside: auto; paint-order: normal; perspective: none; perspective-origin-x: ; perspective-origin-y: ; pointer-events: auto; position: static; quotes: auto; r: 0px; resize: none; right: auto; rotate: none; row-gap: normal; rx: auto; ry: auto; scale: none; scroll-behavior: auto; scroll-margin-block: 0px; scroll-margin-bottom: 0px; scroll-margin-inline: 0px; scroll-margin-left: 0px; scroll-margin-right: 0px; scroll-margin-top: 0px; scroll-padding-block: auto; scroll-padding-bottom: auto; scroll-padding-inline: auto; scroll-padding-left: auto; scroll-padding-right: auto; scroll-padding-top: auto; scroll-snap-align: none; scroll-snap-stop: normal; scroll-snap-type: none; shape-image-threshold: 0; shape-margin: 0px; shape-outside: none; shape-rendering: auto; size: ; speak-as: normal; stop-color: rgb(0, 0, 0); stop-opacity: 1; stroke: none; stroke-color: rgba(0, 0, 0, 0); stroke-dasharray: none; stroke-dashoffset: 0px; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 4; stroke-opacity: 1; stroke-width: 1px; tab-size: 8; table-layout: auto; text-align: start; text-anchor: start; text-decoration: none; text-decoration-color: rgb(255, 0, 0); text-decoration-line: none; text-decoration-skip: auto; text-decoration-style: solid; text-decoration-thickness: auto; text-indent: 0px; text-orientation: mixed; text-overflow: clip; text-rendering: auto; text-shadow: none; text-transform: none; text-underline-offset: auto; text-underline-position: auto; top: auto; touch-action: auto; transform: none; transform-box: view-box; transform-origin-x: ; transform-origin-y: ; transform-origin-z: ; transform-style: flat; transition-delay: 0s; transition-duration: 0s; transition-property: all; transition-timing-function: ease; translate: none; unicode-bidi: normal; vector-effect: none; vertical-align: baseline; visibility: visible; white-space: normal; widows: auto; width: 784px; will-change: auto; word-break: normal; word-spacing: 0px; word-wrap: normal; writing-mode: horizontal-tb; x: 0px; y: 0px; z-index: auto; zoom: 1; -apple-color-filter: none; -webkit-appearance: none; -webkit-backdrop-filter: none; -webkit-backface-visibility: visible; -webkit-background-clip: border-box; -webkit-background-composite: source-over; -webkit-background-origin: padding-box; -webkit-background-size: auto; -webkit-border-fit: border; -webkit-border-horizontal-spacing: 0px; -webkit-border-image: none; -webkit-border-vertical-spacing: 0px; -webkit-box-align: stretch; -webkit-box-decoration-break: slice; -webkit-box-direction: normal; -webkit-box-flex: 0; -webkit-box-flex-group: 1; -webkit-box-lines: single; -webkit-box-ordinal-group: 1; -webkit-box-orient: horizontal; -webkit-box-pack: start; -webkit-box-reflect: none; -webkit-box-shadow: none; -webkit-column-axis: auto; -webkit-column-break-after: auto; -webkit-column-break-before: auto; -webkit-column-break-inside: auto; -webkit-column-progression: normal; -webkit-font-kerning: auto; -webkit-font-smoothing: auto; -webkit-hyphenate-character: auto; -webkit-hyphenate-limit-after: auto; -webkit-hyphenate-limit-before: auto; -webkit-hyphenate-limit-lines: no-limit; -webkit-hyphens: manual; -webkit-initial-letter: normal; -webkit-line-align: none; -webkit-line-box-contain: block inline replaced; -webkit-line-clamp: none; -webkit-line-grid: none; -webkit-line-snap: none; -webkit-locale: auto; -webkit-margin-after-collapse: collapse; -webkit-margin-before-collapse: collapse; -webkit-margin-bottom-collapse: collapse; -webkit-margin-top-collapse: collapse; -webkit-mask-box-image: none; -webkit-mask-box-image-outset: 0; -webkit-mask-box-image-repeat: stretch; -webkit-mask-box-image-slice: 0 fill; -webkit-mask-box-image-source: none; -webkit-mask-box-image-width: auto; -webkit-mask-clip: border-box; -webkit-mask-composite: source-over; -webkit-mask-image: none; -webkit-mask-origin: border-box; -webkit-mask-position-x: 0%; -webkit-mask-position-y: 0%; -webkit-mask-repeat: repeat; -webkit-mask-size: auto; -webkit-mask-source-type: alpha; -webkit-nbsp-mode: normal; -webkit-print-color-adjust: economy; -webkit-rtl-ordering: logical; -webkit-ruby-position: before; -webkit-tap-highlight-color: rgba(0, 0, 0, 0.4); -webkit-text-combine: none; -webkit-text-emphasis-color: rgb(255, 0, 0); -webkit-text-emphasis-position: over right; -webkit-text-emphasis-style: none; -webkit-text-fill-color: rgb(255, 0, 0); -webkit-text-orientation: mixed; -webkit-text-security: none; -webkit-text-stroke-color: rgb(255, 0, 0); -webkit-text-stroke-width: 0px; -webkit-text-zoom: normal; -webkit-transform-style: flat; -webkit-user-drag: auto; -webkit-user-modify: read-only; -webkit-user-select: text;"
>+FAIL cssText on computed style declaration returns the empty string assert_equals: cssText is empty expected "" but got "align-content: normal; align-items: normal; align-self: auto; alignment-baseline: auto; all: ; alt: \"\"; animation-delay: 0s; animation-direction: normal; animation-duration: 0s; animation-fill-mode: none; animation-iteration-count: 1; animation-name: none; animation-play-state: running; animation-timing-function: ease; aspect-ratio: auto; background-attachment: scroll; background-blend-mode: normal; background-clip: border-box; background-color: rgba(0, 0, 0, 0); background-image: none; background-origin: padding-box; background-position-x: 0%; background-position-y: 0%; background-repeat: repeat; background-size: auto; baseline-shift: baseline; block-size: 0px; border-block-end-color: rgb(255, 0, 0); border-block-end-style: none; border-block-end-width: 0px; border-block-start-color: rgb(255, 0, 0); border-block-start-style: none; border-block-start-width: 0px; border-bottom-color: rgb(255, 0, 0); border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-bottom-style: none; border-bottom-width: 0px; border-collapse: separate; border-end-end-radius: 0px; border-end-start-radius: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-inline-end-color: rgb(255, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(255, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(255, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(255, 0, 0); border-right-style: none; border-right-width: 0px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-color: rgb(255, 0, 0); border-top-left-radius: 0px; border-top-right-radius: 0px; border-top-style: none; border-top-width: 0px; bottom: auto; box-shadow: none; box-sizing: content-box; break-after: auto; break-before: auto; break-inside: auto; buffered-rendering: auto; caption-side: top; caret-color: rgb(255, 0, 0); clear: none; clip: auto; clip-path: none; clip-rule: nonzero; color: rgb(255, 0, 0); color-interpolation: sRGB; color-interpolation-filters: linearRGB; color-rendering: auto; column-count: auto; column-fill: balance; column-gap: normal; column-rule-color: rgb(255, 0, 0); column-rule-style: none; column-rule-width: 0px; column-span: none; column-width: auto; contain: none; content: ; counter-increment: none; counter-reset: none; cursor: auto; cx: 0px; cy: 0px; direction: ltr; display: block; dominant-baseline: auto; empty-cells: show; fill: rgb(0, 0, 0); fill-opacity: 1; fill-rule: nonzero; filter: none; flex-basis: auto; flex-direction: row; flex-grow: 0; flex-shrink: 1; flex-wrap: nowrap; float: none; flood-color: rgb(0, 0, 0); flood-opacity: 1; font-family: -webkit-standard; font-feature-settings: normal; font-optical-sizing: auto; font-size: 13.333333015441895px; font-stretch: normal; font-style: normal; font-synthesis: style weight small-caps; font-variant-alternates: normal; font-variant-caps: normal; font-variant-east-asian: normal; font-variant-ligatures: normal; font-variant-numeric: normal; font-variant-position: normal; font-variation-settings: normal; font-weight: normal; glyph-orientation-horizontal: 0deg; glyph-orientation-vertical: auto; grid-auto-columns: auto; grid-auto-flow: row; grid-auto-rows: auto; grid-column-end: auto; grid-column-start: auto; grid-row-end: auto; grid-row-start: auto; grid-template-areas: none; grid-template-columns: none; grid-template-rows: none; hanging-punctuation: none; height: 0px; image-orientation: from-image; image-rendering: auto; inline-size: 784px; inset-block-end: auto; inset-block-start: auto; inset-inline-end: auto; inset-inline-start: auto; isolation: auto; justify-content: normal; justify-items: normal; justify-self: auto; kerning: 0; left: auto; letter-spacing: normal; lighting-color: rgb(255, 255, 255); line-break: auto; line-height: normal; list-style-image: none; list-style-position: outside; list-style-type: disc; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; marker-end: none; marker-mid: none; marker-start: none; mask: none; mask-type: luminance; math-style: normal; max-block-size: none; max-height: none; max-inline-size: none; max-width: none; min-block-size: 0px; min-height: 0px; min-inline-size: 0px; min-width: 0px; mix-blend-mode: normal; object-fit: fill; object-position: 50% 50%; opacity: 1; order: 0; orphans: auto; outline-color: rgb(255, 0, 0); outline-offset: 0px; outline-style: none; outline-width: 0px; overflow-wrap: normal; overflow-x: visible; overflow-y: visible; overscroll-behavior-x: auto; overscroll-behavior-y: auto; padding-block-end: 0px; padding-block-start: 0px; padding-bottom: 0px; padding-inline-end: 0px; padding-inline-start: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; page-break-after: auto; page-break-before: auto; page-break-inside: auto; paint-order: normal; perspective: none; perspective-origin-x: ; perspective-origin-y: ; pointer-events: auto; position: static; quotes: auto; r: 0px; resize: none; right: auto; rotate: none; row-gap: normal; rx: auto; ry: auto; scale: none; scroll-behavior: auto; scroll-margin-block: 0px; scroll-margin-bottom: 0px; scroll-margin-inline: 0px; scroll-margin-left: 0px; scroll-margin-right: 0px; scroll-margin-top: 0px; scroll-padding-block: auto; scroll-padding-bottom: auto; scroll-padding-inline: auto; scroll-padding-left: auto; scroll-padding-right: auto; scroll-padding-top: auto; scroll-snap-align: none; scroll-snap-stop: normal; scroll-snap-type: none; shape-image-threshold: 0; shape-margin: 0px; shape-outside: none; shape-rendering: auto; size: ; speak-as: normal; stop-color: rgb(0, 0, 0); stop-opacity: 1; stroke: none; stroke-color: rgba(0, 0, 0, 0); stroke-dasharray: none; stroke-dashoffset: 0px; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 4; stroke-opacity: 1; stroke-width: 1px; tab-size: 8; table-layout: auto; text-align: start; text-anchor: start; text-decoration: none; text-decoration-color: rgb(255, 0, 0); text-decoration-line: none; text-decoration-skip: auto; text-decoration-style: solid; text-decoration-thickness: auto; text-indent: 0px; text-orientation: mixed; text-overflow: clip; text-rendering: auto; text-shadow: none; text-transform: none; text-underline-offset: auto; text-underline-position: auto; top: auto; touch-action: auto; transform: none; transform-box: view-box; transform-origin-x: ; transform-origin-y: ; transform-origin-z: ; transform-style: flat; transition-delay: 0s; transition-duration: 0s; transition-property: all; transition-timing-function: ease; translate: none; unicode-bidi: normal; vector-effect: none; vertical-align: baseline; visibility: visible; white-space: normal; widows: auto; width: 784px; will-change: auto; word-break: normal; word-spacing: 0px; word-wrap: normal; writing-mode: horizontal-tb; x: 0px; y: 0px; z-index: auto; zoom: 1; -apple-color-filter: none; -webkit-appearance: none; -webkit-backdrop-filter: none; -webkit-backface-visibility: visible; -webkit-background-clip: border-box; -webkit-background-composite: source-over; -webkit-background-origin: padding-box; -webkit-background-size: auto; -webkit-border-fit: border; -webkit-border-horizontal-spacing: 0px; -webkit-border-image: none; -webkit-border-vertical-spacing: 0px; -webkit-box-align: stretch; -webkit-box-decoration-break: slice; -webkit-box-direction: normal; -webkit-box-flex: 0; -webkit-box-flex-group: 1; -webkit-box-lines: single; -webkit-box-ordinal-group: 1; -webkit-box-orient: horizontal; -webkit-box-pack: start; -webkit-box-reflect: none; -webkit-box-shadow: none; -webkit-column-axis: auto; -webkit-column-break-after: auto; -webkit-column-break-before: auto; -webkit-column-break-inside: auto; -webkit-column-progression: normal; -webkit-font-kerning: auto; -webkit-font-smoothing: auto; -webkit-hyphenate-character: auto; -webkit-hyphenate-limit-after: auto; -webkit-hyphenate-limit-before: auto; -webkit-hyphenate-limit-lines: no-limit; -webkit-hyphens: manual; -webkit-initial-letter: normal; -webkit-line-align: none; -webkit-line-box-contain: block inline replaced; -webkit-line-clamp: none; -webkit-line-grid: none; -webkit-line-snap: none; -webkit-locale: auto; -webkit-margin-after-collapse: collapse; -webkit-margin-before-collapse: collapse; -webkit-margin-bottom-collapse: collapse; -webkit-margin-top-collapse: collapse; -webkit-mask-box-image: none; -webkit-mask-box-image-outset: 0; -webkit-mask-box-image-repeat: stretch; -webkit-mask-box-image-slice: 0 fill; -webkit-mask-box-image-source: none; -webkit-mask-box-image-width: auto; -webkit-mask-clip: border-box; -webkit-mask-composite: source-over; -webkit-mask-image: none; -webkit-mask-origin: border-box; -webkit-mask-position-x: 0%; -webkit-mask-position-y: 0%; -webkit-mask-repeat: repeat; -webkit-mask-size: auto; -webkit-mask-source-type: alpha; -webkit-nbsp-mode: normal; -webkit-print-color-adjust: economy; -webkit-rtl-ordering: logical; -webkit-ruby-position: before; -webkit-tap-highlight-color: rgba(0, 0, 0, 0.4); -webkit-text-combine: none; -webkit-text-emphasis-color: rgb(255, 0, 0); -webkit-text-emphasis-position: over right; -webkit-text-emphasis-style: none; -webkit-text-fill-color: rgb(255, 0, 0); -webkit-text-orientation: mixed; -webkit-text-security: none; -webkit-text-stroke-color: rgb(255, 0, 0); -webkit-text-stroke-width: 0px; -webkit-text-zoom: normal; -webkit-transform-style: flat; -webkit-user-drag: auto; -webkit-user-modify: read-only; -webkit-user-select: text;"
>

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Attachments on bug 223569: 423869 | 424002 | 424106 | 424744 | 424765 | 425001 | 425004 | 425152 | 425265 | 425847 | 425874 | 426377