[webkit-changes] [WebKit/WebKit] 571059: Cherry-pick 3e213e67f6ad. https://bugs.webkit.org/...

[Kiet Ho]

  Branch: refs/heads/webkitglib/2.52
  Home:   https://github.com/WebKit/WebKit
  Commit: 571059e95e35d4c83c51c0c9dddad089a1de30cf
      
https://github.com/WebKit/WebKit/commit/571059e95e35d4c83c51c0c9dddad089a1de30cf
  Author: Kiet Ho <kiet...@apple.com>
  Date:   2026-05-29 (Fri, 29 May 2026)

  Changed paths:
    M LayoutTests/TestExpectations
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-parse-valid-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-parse-valid.html
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-size-parse-valid-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-size-parse-valid.html
    M Source/WebCore/css/calc/CSSCalcTree+Parser.cpp

  Log Message:
  -----------
  Cherry-pick 3e213e67f6ad. https://bugs.webkit.org/show_bug.cgi?id=306831

    [css-anchor-position-1] anchor()/anchor-size() fallback value should 
support unitless zero
    rdar://169500991
    https://bugs.webkit.org/show_bug.cgi?id=306831

    Reviewed by Antti Koivisto.

    This patch allows using unitless zero ("0") as fallback value for
    anchor() and anchor-size(), which gets treated as 0px.

    Tests: 
imported/w3c/web-platform-tests/css/css-anchor-position/anchor-parse-valid.html
           
imported/w3c/web-platform-tests/css/css-anchor-position/anchor-parse-invalid.html
           
imported/w3c/web-platform-tests/css/css-anchor-position/anchor-size-parse-valid.html
           
imported/w3c/web-platform-tests/css/css-anchor-position/anchor-size-parse-invalid.html

    * LayoutTests/TestExpectations:
    * 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-parse-valid-expected.txt:
    * 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-parse-valid.html:
    * 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-size-parse-valid-expected.txt:
    * 
LayoutTests/imported/w3c/web-platform-tests/css/css-anchor-position/anchor-size-parse-valid.html:
    * Source/WebCore/css/calc/CSSCalcTree+Parser.cpp:
    (WebCore::CSSCalc::consumeAnchorFallback):
    (WebCore::CSSCalc::consumeAnchor):
    (WebCore::CSSCalc::consumeAnchorSize):

    Canonical link: https://commits.webkit.org/310108@main

    Identifier: 305413.589@safari-7624-branch

Canonical link: https://commits.webkit.org/305877.690@webkitglib/2.52



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