Timothy Flynn 0cb9f4b66f LibWeb: Do not fetch empty CSS URLs ...

If a CSS rule has a URL like `url("")`, it would resolve to the document
URL itself. There isn't a context in which this would result in a valid
resource, so the spec tells us to drop it.

No test here because there isn't really a way to know when a CSS URL is
fetched. We could use PerformanceResourceTiming, but that is only for
HTTP(S) URLs. There is already an existing test for serialization of
empty URLs, which still passes.

2025-11-12 18:30:16 +01:00

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