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LibWeb: Throw error on insertRule with disallowed @namespace rule

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Resolves a FIXME in `CSSRuleList::insert_a_css_rule`. Gets us a bit
closer to passing https://wpt.live/css/cssom/at-namespace.html but that
requires more work around parsing of selectors with namespaces (namely
disallowing use of undeclared selectors), which I have added a FIXME
for.
This commit is contained in:
Callum Law
2025-06-09 22:33:36 +12:00
committed by Sam Atkins
parent 3421cd76fa
commit f53bec3a67
Notes: github-actions[bot] 2025-06-09 10:57:43 +00:00 
Author: https://github.com/Calme1709
Commit: https://github.com/LadybirdBrowser/ladybird/commit/f53bec3a67e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5037
Reviewed-by: https://github.com/AtkinsSJ ✅
4 changed files with 36 additions and 1 deletions
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2
Tests/LibWeb/Text/expected/css/namespace-rules.txt Normal file
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@@ -0,0 +1,2 @@
Can insert namespace rule into sheet with only @namespace and @import rules: PASS
Cannot insert namespace rule into sheet with existing rules: PASS