Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: ce01b79ed142fc10b0097a7d71526f65bf026dea
https://github.com/WebKit/WebKit/commit/ce01b79ed142fc10b0097a7d71526f65bf026dea
Author: Ahmad Saleem <[email protected]>
Date: 2026-02-04 (Wed, 04 Feb 2026)
Changed paths:
A
LayoutTests/fast/table/colspan-width-distribution-auto-percent-expected.txt
A LayoutTests/fast/table/colspan-width-distribution-auto-percent.html
M Source/WebCore/rendering/AutoTableLayout.cpp
Log Message:
-----------
REGRESSION(305120@main): Fix colspan width distribution when auto columns are
converted to percentages
https://bugs.webkit.org/show_bug.cgi?id=306809
rdar://168546944
Reviewed by Alan Baradlay.
When a percentage-width colspan cell spans columns that include both
percentage and auto-width columns, the earlier code converts auto columns
to effective percentages to ensure proper distribution. However, a
subsequent non-percentage colspan over the same columns was incorrectly
applying percentage-based distribution even though no conversion had
occurred for that cell.
This caused regressions where auto columns were treated as if they had
been converted to percentages, leading to incorrect width calculations.
The fix adds a check to verify that auto columns have actually been
converted to effective percentages before applying percentage-based
distribution. This is done by checking if any column has logicalWidth
set to auto but effectiveLogicalWidth set to a percentage value, which
only happens when a previous percentage colspan has processed these
columns.
* Source/WebCore/rendering/AutoTableLayout.cpp:
(WebCore::AutoTableLayout::calcEffectiveLogicalWidth):
* LayoutTests/fast/table/colspan-width-distribution-auto-percent-expected.txt:
Added.
* LayoutTests/fast/table/colspan-width-distribution-auto-percent.html: Added.
Canonical link: https://commits.webkit.org/306780@main
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