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

TextTrackList: change event - Web APIs

TextTrackList: change event

Baseline Widely available

The change event is fired when a text track is made active or inactive, or a TextTrackList is otherwise changed.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("change", (event) => { })

onchange = (event) => { }
Event type

A generic Event with no added properties.

Examples

Using addEventListener():

const mediaElement = document.querySelectorAll("video, audio")[0];
mediaElement.textTracks.addEventListener("change", (event) => {
  console.log(`'${event.type}' event fired`);
});

Using the onchange event handler property:

const mediaElement = document.querySelector("video, audio");
mediaElement.textTracks.onchange = (event) => {
  console.log(`'${event.type}' event fired`);
};
Specifications Browser compatibility See also

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