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---
title: "TextTrackList: addtrack event"
short-title: addtrack
slug: Web/API/TextTrackList/addtrack_event
page-type: web-api-event
browser-compat: api.TextTrackList.addtrack_event
---
{{APIRef("HTML DOM")}}
The **`addtrack`** event is fired when a track is added to a [`TextTrackList`](/en-US/docs/Web/API/TextTrackList).
## Syntax
Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.
```js-nolint
addEventListener("addtrack", (event) => { })
onaddtrack = (event) => { }
```
## Event type
A {{domxref("TrackEvent")}}. Inherits from {{domxref("Event")}}.
{{InheritanceDiagram("TrackEvent")}}
## Examples
Using `addEventListener()`:
```js
const mediaElement = document.querySelector("video, audio");
mediaElement.textTracks.addEventListener("addtrack", (event) => {
console.log(`Text track: ${event.track.label} added`);
});
```
Using the `onaddtrack` event handler property:
```js
const mediaElement = document.querySelector("video, audio");
mediaElement.textTracks.onaddtrack = (event) => {
console.log(`Text track: ${event.track.label} added`);
};
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- Related events: [`removetrack`](/en-US/docs/Web/API/VideoTrackList/removetrack_event), [`change`](/en-US/docs/Web/API/VideoTrackList/change_event)
- This event on [`VideoTrackList`](/en-US/docs/Web/API/VideoTrackList) targets: [`addtrack`](/en-US/docs/Web/API/VideoTrackList/addtrack_event)
- This event on [`AudioTrackList`](/en-US/docs/Web/API/AudioTrackList) targets: [`addtrack`](/en-US/docs/Web/API/AudioTrackList/addtrack_event)
- This event on [`MediaStream`](/en-US/docs/Web/API/MediaStream) targets: [`addtrack`](/en-US/docs/Web/API/MediaStream/addtrack_event)
- [Media Capture and Streams API](/en-US/docs/Web/API/Media_Capture_and_Streams_API)
- [WebRTC](/en-US/docs/Web/API/WebRTC_API)