On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 47 on 2015-12-01
In Chrome Android version 47 on 2015-12-02
In Edge version 79 on 2020-01-15
In Firefox version 25 on 2013-10-29 Note: Before Firefox 58, using MediaStream.addTrack() on a stream obtained using getUserMedia(), then attempting to record the resulting stream would result in only recording the original stream without the added tracks (severe bug).
In Firefox for Android version 25 on 2013-10-29 Note: Before Firefox for Android 58, using MediaStream.addTrack() on a stream obtained using getUserMedia(), then attempting to record the resulting stream would result in only recording the original stream without the added tracks (severe bug).
Not in Internet Explorer
In Quest Browser version 5.0 on undefined
In Opera version 36 on 2016-03-15
In Opera Android version 36 on 2016-03-31
In Safari version 14.1 on 2021-04-26
In Safari on iOS version 14 on 2020-09-16
In Samsung Internet version 5.0 on 2016-12-15
In WebView Android version 47 on 2015-12-02
In WebView on iOS version 14 on 2020-09-16