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https://drafts.csswg.org/selectors

…yntax, matches the given language range in an extended filtering operation per [RFC4647] Matching of Language Tags (section 3.3.2). Both the content language and the language range must be canonicalized and converted to extlang form as per section 4.5 of [RFC5646] prior to the ex…

https://drafts.csswg.org/selectors-4

…yntax, matches the given language range in an extended filtering operation per [RFC4647] Matching of Language Tags (section 3.3.2). Both the content language and the language range must be canonicalized and converted to extlang form as per section 4.5 of [RFC5646] prior to the ex…