Enumeration TextTrackKind

The kind of the text track, represented by a value from the following list:
- 'subtitles': The track contains subtitles.
- 'captions': The track contains closed captions, a translation of dialogue and sound effects.
- 'descriptions': The track contains descriptions, a textual description of the video.
- 'chapters': The track contains chapter titles.
- 'metadata': The track contains metadata. This track will not serve display purposes.