Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b9801cc6c15a25401ed0aba725b2bc46373ae8b8
https://github.com/WebKit/WebKit/commit/b9801cc6c15a25401ed0aba725b2bc46373ae8b8
Author: Ahmad Saleem <[email protected]>
Date: 2025-11-17 (Mon, 17 Nov 2025)
Changed paths:
M
LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/fractions/frac-parameters-3-expected.txt
M LayoutTests/platform/glib/mathml/radical-fallback-expected.txt
M Source/WebCore/rendering/mathml/RenderMathMLBlockInlines.h
Log Message:
-----------
[MathML] Use font underlineThickness as MathML default rule thickness
https://bugs.webkit.org/show_bug.cgi?id=302510
rdar://164693673
Reviewed by Frédéric Wang.
MathML Core defines [1] the default rule thickness as the value of the font’s
post.underlineThickness field. When this value is not available, the fallback
must be zero. WebKit previously used a legacy 0.05em heuristic for rule
thickness. This patch replaces that logic with a direct lookup of the primary
font’s underlineThickness and applies a LayoutUnit conversion. If the metric
is missing, the returned rule thickness is zero.
This aligns WebKit with MathML Core and Chromium’s behavior and removes the
legacy 0.05em fallback.
[1] https://w3c.github.io/mathml-core/#dfn-default-rule-thickness
* Source/WebCore/rendering/mathml/RenderMathMLBlockInlines.h:
(WebCore::RenderMathMLBlock::ruleThicknessFallback const):
*
LayoutTests/imported/w3c/web-platform-tests/mathml/presentation-markup/fractions/frac-parameters-3-expected.txt:
Progression
* LayoutTests/platform/glib/mathml/radical-fallback-expected.txt: Platform
Specific Rebaseline (No Rendering Change)
Canonical link: https://commits.webkit.org/303108@main
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