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LibWeb: Handle empty string namespaces in selector matching

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Per the CSS Namespaces spec, an empty string declared in an
@namespace rule represents no namespace.

Fixes WPT:
- css/css-namespaces/prefix-002.xml
- css/css-namespaces/prefix-003.xml
This commit is contained in:
mikiubo
2025-11-13 21:01:14 +01:00
committed by Sam Atkins
parent 6951ef4ee3
commit 88e19ebc11
Notes: github-actions[bot] 2025-11-14 08:18:27 +00:00 
Author: https://github.com/mikiubo
Commit: https://github.com/LadybirdBrowser/ladybird/commit/88e19ebc11f
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6815
Reviewed-by: https://github.com/AtkinsSJ ✅
4 changed files with 50 additions and 0 deletions
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15
Tests/LibWeb/Ref/input/wpt-import/css/css-namespaces/prefix-003.xml Normal file
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@@ -0,0 +1,15 @@
<root>
<head xmlns="http://www.w3.org/1999/xhtml">
<link rel="author" title="Anne van Kesteren" href="http://annevankesteren.nl/"/>
<link rel="author" title="Opera Software ASA" href="http://opera.com/"/>
<link rel="help" href="http://www.w3.org/TR/css-namespaces-3/#prefixes"/>
<link rel="match" href="../../../../expected/wpt-import/css/css-namespaces/reference/ref-lime-1-generic.xml"/>
<title>CSS Namespaces Test Suite: empty string prefix (Implied element namespace)</title>
<style>
@namespace foo "";
t { background:red }
foo|t { background:lime }
</style>
</head>
<t>This sentence should have a green background.</t>
</root>