On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 49 on 2016-03-02 Note: Before Chrome 49, only video is supported, not audio.
In Chrome Android version 49 on 2016-03-09 Note: Before Chrome Android 49, only video is supported, not audio.
In Edge version 79 on 2020-01-15
In Firefox version 25 on 2013-10-29 Note: Starting with Firefox 71, the behavior of mimeType is more consistent. For example, it now returns the media type even after recording has stopped.
In Firefox for Android version 25 on 2013-10-29
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 49 on 2016-03-09 Note: Before WebView Android 49, only video is supported, not audio.
In WebView on iOS version 14 on 2020-09-16