Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 9f6f458310da74a70a4b35a6478d1aa0667a995b
https://github.com/WebKit/WebKit/commit/9f6f458310da74a70a4b35a6478d1aa0667a995b
Author: Ahmad Saleem <[email protected]>
Date: 2026-10-05 (Mon, 05 Oct 2026)
Changed paths:
M
LayoutTests/imported/w3c/web-platform-tests/css/css-overscroll-behavior/parsing/overscroll-behavior-computed-expected.txt
M
LayoutTests/imported/w3c/web-platform-tests/css/css-overscroll-behavior/parsing/overscroll-behavior-computed.html
M Source/WebCore/style/StyleExtractorCustom.h
Log Message:
-----------
[Style] The overscroll-behavior shorthand serializes max(x, y) instead of
both axis values in getComputedStyle
https://bugs.webkit.org/show_bug.cgi?id=325429
rdar://188534035
Reviewed by Antti Koivisto.
This patch aligns WebKit with Gecko / Firefox and Blink / Chromium.
The PropertyExtractorAdaptor for the overscroll-behavior shorthand
serialized the value as std::max(overscrollBehaviorX(),
overscrollBehaviorY()). Because OverscrollBehavior is ordered
Auto < Contain < None, this collapsed both axes into a single
"strongest" keyword, dropping the second value entirely: e.g.
`overscroll-behavior: contain auto` reported back as `contain`.
This was carried over verbatim from the old
CSSComputedStyleDeclaration. Per the spec [1], overscroll-behavior is a
shorthand that sets overscroll-behavior-x and overscroll-behavior-y in
that order, defaulting the second value to the first when only one is
given:
[1] https://drafts.csswg.org/css-overscroll/#overscroll-shorthand
It must therefore serialize both values as "x y" in canonical order,
coalescing to a single value only when the two axes are equal, matching
the parsed-declaration path in ShorthandSerializer::serializePair.
Serialize both axes, coalescing when they match, matching the pattern
used by the neighboring shorthand adaptors.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-overscroll-behavior/parsing/overscroll-behavior-computed.html:
*
LayoutTests/imported/w3c/web-platform-tests/css/css-overscroll-behavior/parsing/overscroll-behavior-computed-expected.txt:
* Source/WebCore/style/StyleExtractorCustom.h:
(WebCore::Style::PropertyExtractorAdaptor<CSSPropertyOverscrollBehavior>::computedValue
const):
Canonical link: https://commits.webkit.org/322685@main
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