On the standards track: Yes
Is Experimental: No
Is Deprecated: No
Not in Chrome
Not in Chrome Android
Not in Edge
In Firefox version 68 on 2019-07-09 Note: Firefox 68 implements the updated standard's definition of the "first" audio track; now the first track is the one whose ID comes first lexicographically.
In Firefox for Android version 68 on 2019-07-09 Note: Firefox for Android 68 implements the updated standard's definition of the "first" audio track; now the first track is the one whose ID comes first lexicographically.
Not in Internet Explorer
Not in Quest Browser
Not in Opera
Not in Opera Android
Not in Safari
Not in Safari on iOS
Not in Samsung Internet
Not in WebView Android
Not in WebView on iOS