Callum Law f53bec3a67 LibWeb: Throw error on insertRule with disallowed @namespace rule ...

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.

2025-06-09 11:56:24 +01:00

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