T.3 Timed Data
The Multi-device Timing Community Group aims to facilitate precise playback and control of timed data, i.e. timed subtitles, timed cues, timed events, timed triggers etc.
A section of the timing object draft specification is concerned with sequencing of timed data.
This proposes the introduction of a new TimedTextTrack as an extension of the existing TextTrack concept. Crucially, the TimedTextTrack is directed by a TimingObject instead of a HTMLMediaElement.
A more detailed introduction to sequencing of timed data is available here
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