LibWeb: Implement matches attribute on CSSSupportsRule and CSSMediaRule

Gains us 4 WPT tests.
Author: https://github.com/Calme1709 Commit: 1a0d4487a8 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5395 Reviewed-by: https://github.com/gmta ✅
2025-08-01 05:39:11 +00:00 · 2025-07-11 17:09:30 +12:00 · 2025-07-11 17:09:30 +12:00 · 1a0d4487a8 · 2025-07-11 08:58:53 +00:00
commit 1a0d4487a8
parent fc395f9824
7 changed files with 132 additions and 0 deletions
--- a/Libraries/LibWeb/CSS/CSSSupportsRule.idl
+++ b/Libraries/LibWeb/CSS/CSSSupportsRule.idl
@ -3,4 +3,5 @@
 // https://drafts.csswg.org/css-conditional-3/#the-csssupportsrule-interface
 [Exposed=Window]
 interface CSSSupportsRule : CSSConditionRule {
+    readonly attribute boolean matches;
 };