track
Definition and Usage
The <track> tag specifies text tracks for media elements (<audio> and <video>). This element is used to specify subtitles, caption files or other files containing text, that should be visible when the media is playing. The HTML 5<track> tag is used to specify external timed text tracks for media elements (i.e. the <video> element and the <audio> element). The text tracks specified with the <track> tag could include subtitles, captions, descriptions, chapters, and metadata.. It lets you specify timed text tracks (or time-based data), for example to automatically handle subtitles.
A video with two subtitle tracks: source and track