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[[ 9.29. Language tag # A valid language tag, as defined in RFC 5646 [RFC5646]. ]] This should say BCP 47 instead of RFC 5646, and the reference should also be fixed. cf. http://dev.w3.org/html5/spec/dom.html#the-lang-and-xml:lang-attributes which references BCP 47. Reason: BCP 47 is a non-changing names for the specifications related to language tagging.
Fixed.: http://dev.w3.org/html5/markup/references.html#refsBCP47 http://dev.w3.org/html5/markup/datatypes.html#common.data.langcode