This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The language read-only property of the TextTrack interface returns the language of the text track.
This uses the same values as the HTML lang attribute. These values are documented in RFC 5646: Tags for Identifying Languages (also known as BCP 47).
A string containing a language identifier. For example, "en-US" for United States English or "pt-BR" for Brazilian Portuguese.
In the following example the value of language is printed to the console.
let video = document.querySelector("video");
let track = video.addTextTrack("captions", "Captions", "en-US");
track.mode = "showing";
console.log(track.language);
| Specification |
|---|
| HTML> # dom-texttrack-language-dev> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
language |
23 | 12 | 31 | ≤12.1 | 6 | 25 | 31 | ≤12.1 | 7 | 1.5 | 4.4 | 7 |
© 2005–2025 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/TextTrack/language