Callum Law 80ea865b19 LibWeb: Use correct error for invalid rule in nested insertRule ...

When we try to insert a disallowed (non-nested) statement into a
CSSGroupingRule we should throw a `HierarchyRequestError` as it being
disallowed is a "constraint specified by CSS". Previously we would rely
on `Parser::is_valid_in_the_current_context` and throw a Syntax error.

There are more constraints to be implemented.

2025-06-23 12:52:40 +01:00

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