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With this, we pass the 8 ref tests in css/selectors/selectors-4/ which previously failed. This is not technically a full implementation, as we are supposed to first canonicalize the language range and tag, but that will require downloading and processing the IANA language subtag registry: https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry That's significantly more work, and WPT doesn't seem to test any cases that require that, so we can leave it for now.