On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 23 on 2012-11-06 Note: codecs string can contain any subset of optional parameters (should be all or none). Errors if codecs string contains unexpected characters (should evaluate string up to character).
In Chrome Android version 25 on 2013-02-27 Note: codecs string can contain any subset of optional parameters (should be all or none). Errors if codecs string contains unexpected characters (should evaluate string up to character).
In Edge version 12 on 2015-07-29 Note: codecs string can contain any subset of optional parameters (should be all or none). Errors if codecs string contains unexpected characters (should evaluate string up to character).
In Firefox version 42 on 2015-11-03 Note: Before Firefox 101, isTypeSupported() ignored codecs parameter options for av01 codecs (treating them as av1).
In Firefox for Android version 41 on 2015-09-22 Note: Before Firefox 101, isTypeSupported() ignored codecs parameter options for av01 codecs (treating them as av1).
In Internet Explorer version 11 on 2013-10-17 Note: Only works on Windows 8+.
In Quest Browser version 5.0 on undefined Note: codecs string can contain any subset of optional parameters (should be all or none). Errors if codecs string contains unexpected characters (should evaluate string up to character).
In Opera version 15 on 2013-07-02 Note: codecs string can contain any subset of optional parameters (should be all or none). Errors if codecs string contains unexpected characters (should evaluate string up to character).
In Opera Android version 14 on 2013-05-21 Note: codecs string can contain any subset of optional parameters (should be all or none). Errors if codecs string contains unexpected characters (should evaluate string up to character).
In Safari version 8 on 2014-10-16
In Safari on iOS version 13 on 2019-09-19 Note: Exposed in Mobile Safari on iPad but not on iPhone.
In Samsung Internet version 1.5 on 2013-09-25 Note: codecs string can contain any subset of optional parameters (should be all or none). Errors if codecs string contains unexpected characters (should evaluate string up to character).
In WebView Android version 4.4.3 on 2014-06-02 Note: codecs string can contain any subset of optional parameters (should be all or none). Errors if codecs string contains unexpected characters (should evaluate string up to character).
Not in WebView on iOS