The track element provides a simple, standardized way to add subtitles, captions, screen reader descriptions and chapters to video and audio.
Tracks can also be used for other kinds of timed metadata. The source data for each track element is a text file made up of a list of timed
cues, and cues can include data in formats such as JSON or CSV. This is extremely powerful, enabling deep linking and media navigation via text search, for example, or DOM manipulation and other behaviour synchronised with media playback.
The track element is currently available in Internet Explorer 10 and Chrome 18+. Firefox support is not yet implemented. In Chrome, track element support must be enabled from the chrome://flags page.
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