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Merged
webkit-commit-queue merged 1 commit into from
Oct 24, 2025
Merged

Implement math-depth. #52063

webkit-commit-queue merged 1 commit into from
Oct 24, 2025

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@eerii eerii commented Oct 9, 2025 •
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Implement math-depth.
https://bugs.webkit.org/show_bug.cgi?id=300967

Reviewed by Antti Koivisto and Sam Weinig.

Parse and implement the `math-depth` property defined on MathML Core:
https://w3c.github.io/mathml-core/#propdef-math-depth.
This is gated behind the `CSSMathDepth` preference.
At the moment the property doesn't do anything, a followup patch for
`font-size: math` is required.

* LayoutTests/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-cascade/all-prop-revert-layer-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-001.tentative-expected.txt: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/relations/css-styling/attribute-mapping-002-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/mathml/relations/css-styling/parsing/math-depth-computed-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/mathml/relations/css-styling/parsing/math-depth-valid-expected.txt:
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-001.tentative-expected.txt: Removed.
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/mathml/relations/css-styling/attribute-mapping-002-expected.txt:
* LayoutTests/platform/ios/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
* LayoutTests/platform/ios/imported/w3c/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-001.tentative-expected.txt: Removed.
* LayoutTests/platform/ios/imported/w3c/web-platform-tests/mathml/relations/css-styling/attribute-mapping-002-expected.txt: Removed.
* LayoutTests/platform/mac-wk1/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
* LayoutTests/platform/mac-wk1/imported/w3c/web-platform-tests/css/css-cascade/all-prop-revert-layer-expected.txt:
* LayoutTests/platform/mac/imported/w3c/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-001.tentative-expected.txt: Removed.
* LayoutTests/platform/mac/imported/w3c/web-platform-tests/mathml/relations/css-styling/attribute-mapping-002-expected.txt: Removed.
* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:
* Source/WebCore/Headers.cmake:
* Source/WebCore/Sources.txt:
* Source/WebCore/WebCore.xcodeproj/project.pbxproj:
* Source/WebCore/css/CSSProperties.json:
* Source/WebCore/css/CSSValueKeywords.in:
* Source/WebCore/css/mathml.css:
(math):
(mfrac > *):
(mroot > :not(:first-child)):
(msub > :not(:first-child),):
(mroot > *:last-child): Deleted.
(msub > * + *, msup > * + *, msubsup > * + *, mmultiscripts > * + *, munder > * + *, mover > * + *, munderover > * + *): Deleted.
* Source/WebCore/css/parser/CSSParserContext.cpp:
(WebCore::applyUASheetBehaviorsToContext):
* Source/WebCore/rendering/style/RenderStyle.h:
* Source/WebCore/rendering/style/RenderStyleInlines.h:
(WebCore::RenderStyle::initialMathDepth):
(WebCore::RenderStyle::mathDepth const):
* Source/WebCore/rendering/style/RenderStyleSetters.h:
(WebCore::RenderStyle::setMathDepth):
* Source/WebCore/rendering/style/StyleRareInheritedData.cpp:
(WebCore::StyleRareInheritedData::StyleRareInheritedData):
(WebCore::StyleRareInheritedData::operator== const):
(WebCore::StyleRareInheritedData::dumpDifferences const):
* Source/WebCore/rendering/style/StyleRareInheritedData.h:
* Source/WebCore/style/values/math/StyleMathDepth.cpp: Added.
(WebCore::Style::CSSValueConversion<MathDepth>::operator):
* Source/WebCore/style/values/math/StyleMathDepth.h: Added.

Canonical link: https://commits.webkit.org/302116@main

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@eerii eerii requested a review from weinig October 16, 2025 08:28
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Looks fine to me, but I like to hear @anttijk's thoughts on the top-priority part.

Source/WebCore/css/CSSProperties.json
"animation-wrapper": "StyleTypeWrapper",
"settings-flag": "cssMathDepthEnabled",
"style-converter": "StyleType<MathDepth>",
"top-priority": true,
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I'd like @anttijk to weigh in on what the costs of adding a new top-priority property might be.

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Great, thanks. For what is worth, Chromium does this too, since this property needs to resolve before the font-size one: https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/css/css_properties.json5;l=1747?q=%22math-depth%22%20file:properties.json

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Yes, we have to do that, Stylo (used by Firefox/Servo) does that too: https://searchfox.org/firefox-main/rev/8e5d58cfed616cb90586c614e53d8ab1ffc8af27/servo/components/style/properties/data.py#55

In practice math-depth is only used for MathML subtrees, so that shouldn't impact the performance when MathML is not used.

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I don't think there is really much cost.

@eerii eerii closed this Oct 17, 2025
@eerii eerii reopened this Oct 17, 2025
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✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug   🧪 wpe-wk2 ⏳ 🧪 win-tests
✅ 🧪 webkitperl ❌ 🧪 ios-wk2   🧪 api-mac   🧪 api-wpe
⏳ 🧪 ios-wk2-wpt ❌ 🧪 mac-wk1 ✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc   🧪 api-ios ❌ 🧪 mac-wk2 ✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64 ✅ 🛠 vision ❌ 🧪 mac-AS-debug-wk2   🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-wk2-stress   🧪 api-gtk
❌ 🧪 vision-wk2   🧪 mac-intel-wk2   🛠 playstation
✅ 🛠 tv ✅ 🛠 mac-safer-cpp ✅ 🛠 jsc-armv7
✅ 🛠 tv-sim ✅ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

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webkit-early-warning-system commented Oct 17, 2025 •
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EWS run on previous version of this PR (hash 788016c)

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Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
✅ 🧪 style ✅ 🛠 ios ✅ 🛠 mac ✅ 🛠 wpe ✅ 🛠 win
✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug ✅ 🧪 wpe-wk2 ✅ 🧪 win-tests
✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 ios-wk2-wpt ✅ 🧪 mac-wk1 ✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc ✅ 🧪 api-ios ✅ 🧪 mac-wk2 ✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64 ✅ 🛠 vision ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-wk2-stress ✅ 🧪 api-gtk
✅ 🧪 vision-wk2 ✅ 🧪 mac-intel-wk2   🛠 playstation
✅ 🛠 tv ✅ 🛠 mac-safer-cpp ✅ 🛠 jsc-armv7
✅ 🛠 tv-sim ✅ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

@eerii eerii requested a review from anttijk October 17, 2025 14:45
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webkit-early-warning-system commented Oct 24, 2025 •
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EWS run on current version of this PR (hash 7cf5016)

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Misc iOS, visionOS, tvOS & watchOS macOS Linux Windows
✅ 🧪 style ✅ 🛠 ios ✅ 🛠 mac ✅ 🛠 wpe ✅ 🛠 win
✅ 🧪 bindings ✅ 🛠 ios-sim ✅ 🛠 mac-AS-debug ✅ 🧪 wpe-wk2 ❌ 🧪 win-tests
✅ 🧪 webkitperl ✅ 🧪 ios-wk2 ✅ 🧪 api-mac ✅ 🧪 api-wpe
✅ 🧪 ios-wk2-wpt ✅ 🧪 mac-wk1 ✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc ✅ 🧪 api-ios ✅ 🧪 mac-wk2 ✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64 ✅ 🛠 vision ✅ 🧪 mac-AS-debug-wk2 ✅ 🧪 gtk-wk2
✅ 🛠 vision-sim ✅ 🧪 mac-wk2-stress ✅ 🧪 api-gtk
✅ 🛠 🧪 merge ✅ 🧪 vision-wk2 ✅ 🧪 mac-intel-wk2   🛠 playstation
✅ 🛠 tv   🛠 mac-safer-cpp ✅ 🛠 jsc-armv7
✅ 🛠 tv-sim ✅ 🧪 jsc-armv7-tests
✅ 🛠 watch
✅ 🛠 watch-sim

@aperezdc aperezdc added safe-merge-queue Applied to automatically send a pull-request to merge-queue after passing EWS checks and removed merging-blocked Applied to prevent a change from being merged labels Oct 24, 2025
@Ahmad-S792 Ahmad-S792 added merge-queue Applied to send a pull request to merge-queue and removed safe-merge-queue Applied to automatically send a pull-request to merge-queue after passing EWS checks labels Oct 24, 2025
@eerii
Implement math-depth.
11f6206 
https://bugs.webkit.org/show_bug.cgi?id=300967

Reviewed by Antti Koivisto and Sam Weinig.

Parse and implement the `math-depth` property defined on MathML Core:
https://w3c.github.io/mathml-core/#propdef-math-depth.
This is gated behind the `CSSMathDepth` preference.
At the moment the property doesn't do anything, a followup patch for
`font-size: math` is required.

* LayoutTests/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-cascade/all-prop-revert-layer-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-001.tentative-expected.txt: Added.
* LayoutTests/imported/w3c/web-platform-tests/mathml/relations/css-styling/attribute-mapping-002-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/mathml/relations/css-styling/parsing/math-depth-computed-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/mathml/relations/css-styling/parsing/math-depth-valid-expected.txt:
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-001.tentative-expected.txt: Removed.
* LayoutTests/platform/glib/imported/w3c/web-platform-tests/mathml/relations/css-styling/attribute-mapping-002-expected.txt:
* LayoutTests/platform/ios/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
* LayoutTests/platform/ios/imported/w3c/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-001.tentative-expected.txt: Removed.
* LayoutTests/platform/ios/imported/w3c/web-platform-tests/mathml/relations/css-styling/attribute-mapping-002-expected.txt: Removed.
* LayoutTests/platform/mac-wk1/imported/w3c/web-platform-tests/css/css-cascade/all-prop-initial-xml-expected.txt:
* LayoutTests/platform/mac-wk1/imported/w3c/web-platform-tests/css/css-cascade/all-prop-revert-layer-expected.txt:
* LayoutTests/platform/mac/imported/w3c/web-platform-tests/css/css-fonts/math-script-level-and-math-style/math-script-level-001.tentative-expected.txt: Removed.
* LayoutTests/platform/mac/imported/w3c/web-platform-tests/mathml/relations/css-styling/attribute-mapping-002-expected.txt: Removed.
* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:
* Source/WebCore/Headers.cmake:
* Source/WebCore/Sources.txt:
* Source/WebCore/WebCore.xcodeproj/project.pbxproj:
* Source/WebCore/css/CSSProperties.json:
* Source/WebCore/css/CSSValueKeywords.in:
* Source/WebCore/css/mathml.css:
(math):
(mfrac > *):
(mroot > :not(:first-child)):
(msub > :not(:first-child),):
(mroot > *:last-child): Deleted.
(msub > * + *, msup > * + *, msubsup > * + *, mmultiscripts > * + *, munder > * + *, mover > * + *, munderover > * + *): Deleted.
* Source/WebCore/css/parser/CSSParserContext.cpp:
(WebCore::applyUASheetBehaviorsToContext):
* Source/WebCore/rendering/style/RenderStyle.h:
* Source/WebCore/rendering/style/RenderStyleInlines.h:
(WebCore::RenderStyle::initialMathDepth):
(WebCore::RenderStyle::mathDepth const):
* Source/WebCore/rendering/style/RenderStyleSetters.h:
(WebCore::RenderStyle::setMathDepth):
* Source/WebCore/rendering/style/StyleRareInheritedData.cpp:
(WebCore::StyleRareInheritedData::StyleRareInheritedData):
(WebCore::StyleRareInheritedData::operator== const):
(WebCore::StyleRareInheritedData::dumpDifferences const):
* Source/WebCore/rendering/style/StyleRareInheritedData.h:
* Source/WebCore/style/values/math/StyleMathDepth.cpp: Added.
(WebCore::Style::CSSValueConversion<MathDepth>::operator):
* Source/WebCore/style/values/math/StyleMathDepth.h: Added.

Canonical link: https://commits.webkit.org/302116@main
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webkit-commit-queue commented Oct 24, 2025

Committed 302116@main (11f6206): https://commits.webkit.org/302116@main

Reviewed commits have been landed. Closing PR #52063 and removing active labels.

@webkit-commit-queue webkit-commit-queue merged commit 11f6206 into WebKit:main Oct 24, 2025
@webkit-commit-queue webkit-commit-queue removed the merge-queue Applied to send a pull request to merge-queue label Oct 24, 2025
@eerii eerii deleted the math-depth-pr branch October 25, 2025 09:22
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@fred-wang fred-wang fred-wang left review comments

@weinig weinig weinig approved these changes

@anttijk anttijk anttijk approved these changes

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@eerii @webkit-early-warning-system @webkit-commit-queue @fred-wang @weinig @anttijk @aperezdc @Ahmad-S792 @webkit-ews-buildbot