Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 24929a7d9dcc0eaa8d8e9cdea6e5b2371bfe2d73
      
https://github.com/WebKit/WebKit/commit/24929a7d9dcc0eaa8d8e9cdea6e5b2371bfe2d73
  Author: Sam Weinig <s...@webkit.org>
  Date:   2025-04-26 (Sat, 26 Apr 2025)

  Changed paths:
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-backgrounds/parsing/background-position-x-computed-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-backgrounds/parsing/background-position-x-valid-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-backgrounds/parsing/background-position-y-computed-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-backgrounds/parsing/background-position-y-valid-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-shapes/shape-functions/shape-function-valid.tentative-expected.txt
    A 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-computed.tentative-expected.txt
    A 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-computed.tentative.html
    A 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-invalid.tentative-expected.txt
    A 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-invalid.tentative.html
    A 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-valid.tentative-expected.txt
    A 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-valid.tentative.html
    M Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml
    M Source/WebCore/css/parser/CSSParserContext.cpp
    M Source/WebCore/css/parser/CSSParserContext.h
    M Source/WebCore/css/parser/CSSPropertyParserConsumer+Position.cpp
    M Source/WebCore/css/values/primitives/CSSPosition.h
    M Source/WebCore/style/values/primitives/StylePosition.cpp

  Log Message:
  -----------
  Add support for axis relative keywords to for <position>
https://bugs.webkit.org/show_bug.cgi?id=292069

Reviewed by Darin Adler.

Adds support for the axis relative keywords for <position>
and <bg-position> including:

  - x-start
  - x-end
  - y-start
  - y-end

These are all resolved at style building time, so only the CSS specified
value representation, parsing and style conversion needed updating.

Enabled behind a preference flag CSSAxisRelativePositionKeywordsEnabled.

* 
LayoutTests/imported/w3c/web-platform-tests/css/css-backgrounds/parsing/background-position-x-computed-expected.txt:
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-backgrounds/parsing/background-position-x-valid-expected.txt:
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-backgrounds/parsing/background-position-y-computed-expected.txt:
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-backgrounds/parsing/background-position-y-valid-expected.txt:
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-shapes/shape-functions/shape-function-valid.tentative-expected.txt:
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-computed.tentative-expected.txt:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-computed.tentative.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-invalid.tentative-expected.txt:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-invalid.tentative.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-valid.tentative-expected.txt:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-values/position/position-valid.tentative.html:
 Added.
    - Add and update tests.

* Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml:
    - Add new preference flag CSSAxisRelativePositionKeywordsEnabled that the 
new functionality is behind.

* Source/WebCore/css/parser/CSSParserContext.cpp:
* Source/WebCore/css/parser/CSSParserContext.h:
    - Pipe the preferences flag to the parser context for use by the parser.

* Source/WebCore/css/parser/CSSPropertyParserConsumer+Position.cpp:
    - Support parsing the new forms.

* Source/WebCore/css/values/primitives/CSSPosition.h:
    - Support representing the new forms.

* Source/WebCore/style/values/primitives/StylePosition.cpp:
    - Support resolving the new forms.

Canonical link: https://commits.webkit.org/294158@main



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