Allow external language information to apply #257
Merged
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Make it possible for
<track srclang>
(or other external language)to apply to the WebVTT nodes for the purpose of CSS
:lang()
matching,glyph selection, etc.
"WebVTT cue text parsing rules" takes an optional fallback language.
The "rules for updating the display of WebVTT text tracks" also takes
an optional fallback language, since it is the entry point for HTML
and this algorithm then invokes the "WebVTT cue text parsing rules".
getCueAsHTML()
does not provide a fallback language.Fixes (1) in https://www.w3.org/Bugs/Public/show_bug.cgi?id=28255#c16.