[webkit-changes] [WebKit/WebKit] 255461: Implement at-rule function for use with @supports

[Kiet Ho]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 2554611264c43093962c273f23a634ae437a0bde
      
https://github.com/WebKit/WebKit/commit/2554611264c43093962c273f23a634ae437a0bde
  Author: Kiet Ho <kiet...@apple.com>
  Date:   2026-08-03 (Mon, 03 Aug 2026)

  Changed paths:
    M 
LayoutTests/imported/w3c/web-platform-tests/css/css-conditional/js/supports-at-rule-expected.txt
    M Source/WebCore/css/CSSValueKeywords.in
    M Source/WebCore/css/parser/CSSSupportsParser.cpp
    M Source/WebCore/css/parser/CSSSupportsParser.h

  Log Message:
  -----------
  Implement at-rule function for use with @supports
rdar://87884897
https://bugs.webkit.org/show_bug.cgi?id=235400

Reviewed by Tim Nguyen.

Implement @supports at-rule(<at-rule>), which evaluates to Supported if
the CSS at-rule is supported.

Test: 
imported/w3c/web-platform-tests/css/css-conditional/js/supports-at-rule.html

* 
LayoutTests/imported/w3c/web-platform-tests/css/css-conditional/js/supports-at-rule-expected.txt:
* Source/WebCore/css/CSSValueKeywords.in:
* Source/WebCore/css/parser/CSSSupportsParser.cpp:
(WebCore::CSSSupportsParser::consumeSupportsFunction):
(WebCore::CSSSupportsParser::consumeSupportsAtRuleFunction):
(WebCore::CSSSupportsParser::consumeSupportsFontTechFunction):
* Source/WebCore/css/parser/CSSSupportsParser.h:

Canonical link: https://commits.webkit.org/318482@main



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