Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 883d57d213040747f441fc61e3f86c4fa65401d5
https://github.com/WebKit/WebKit/commit/883d57d213040747f441fc61e3f86c4fa65401d5
Author: Ahmad Saleem <[email protected]>
Date: 2026-03-23 (Mon, 23 Mar 2026)
Changed paths:
M
LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/operators/symmetric-largeop-expected.txt
M LayoutTests/platform/glib/mathml/opentype/large-operators-expected.txt
M LayoutTests/platform/glib/mathml/opentype/opentype-stretchy-expected.txt
M LayoutTests/platform/ios/mathml/opentype/opentype-stretchy-expected.txt
M LayoutTests/platform/mac/mathml/opentype/opentype-stretchy-expected.txt
M Source/WebCore/rendering/mathml/RenderMathMLOperator.cpp
Log Message:
-----------
[MathML] Symmetric non-stretchy largeop operators should center around math
axis
https://bugs.webkit.org/show_bug.cgi?id=308413
rdar://170905663
Reviewed by Frédéric Wang.
This patch aligns WebKit with Gecko / Firefox and Blink / Chromium.
Non-stretchy large operators with symmetric="true" were incorrectly placed
on the baseline instead of being centered around the math axis. The
verticalStretchedOperatorShift() only computed shifts for stretchy operators.
This patch restructures the baseline shift logic in firstLineBaseline() to
follow the spec structure from
https://w3c.github.io/mathml-core/#layout-of-operators:
first handling stretchy vertical operators, then largeop symmetric operators.
The shift formula uses the spec's definition directly:
shift = (ascent - descent - 2 * axisHeight) / 2.
* Source/WebCore/rendering/mathml/RenderMathMLOperator.cpp:
(WebCore::RenderMathMLOperator::firstLineBaseline const):
*
LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/operators/symmetric-largeop-expected.txt:
Progression
* LayoutTests/platform/glib/mathml/opentype/large-operators-expected.txt:
Rebaseline
* LayoutTests/platform/glib/mathml/opentype/opentype-stretchy-expected.txt:
Ditto
* LayoutTests/platform/ios/mathml/opentype/opentype-stretchy-expected.txt: Ditto
* LayoutTests/platform/mac/mathml/opentype/opentype-stretchy-expected.txt: Ditto
Canonical link: https://commits.webkit.org/309778@main
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