Question

How to identify that the track is to be enabled if the user's preferences do not indicate that another track would be more appropriate in HTML?

Answer 1

The srclang attribute gives the language of the text track data. ... be enabled if the user's preferences do not indicate that another track would be more appropriate. There must not be more than one track element with the same .... (Whether the codecs parameter is allowed or not depends on the MIME type.) ...