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For additional information, see https://html.spec.whatwg.org/multipage/media.html#texttracklist

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Extends

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Properties

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length

length: number For additional information, see https://html.spec.whatwg.org/multipage/media.html#dom-texttracklist-length.

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onaddtrack?

optional onaddtrack: EventListener For additional information, see https://html.spec.whatwg.org/multipage/media.html#handler-tracklist-onaddtrack.
Last modified on February 25, 2026