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Step 1 of the TrackDefault constructor needs to be fixed so that it doesn't always throw an exception. "if language is not an empty string or language is not a BCP 47 language tag" should be changed to "If language is not an empty string and language is not a BCP 47 language tag"
Change committed... https://dvcs.w3.org/hg/html-media/rev/97e7a06cbc4d