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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/HTMLMediaElement/addTextTrack below:

HTMLMediaElement: addTextTrack() method - Web APIs

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The addTextTrack() method of the HTMLMediaElement interface creates a new TextTrack object and adds it to the media element. It fires an addtrack event on this media element's textTracks. This method can't be used on a TextTrackList interface, only an HTMLMediaElement.

addTextTrack(kind)
addTextTrack(kind, label)
addTextTrack(kind, label, language)

kind

A string representing the TextTrack.kind property (subtitles, captions, descriptions, chapters, or metadata).

label

A string representing the TextTrack.label property.

language

A string representing the TextTrack.language property.

The newly created TextTrack object.

None.

This example adds a new TextTrack with the kind set to "subtitles", and adds a new VTTCue to that.

const video = document.querySelector("video");
const newTrack = video.addTextTrack("subtitles");
newTrack.addCue(new VTTCue(3, 6, "Hello world!"));
console.log(newTrack.cues[0].text);
// "Hello world!"

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