On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 1 on 2008-12-11
In Chrome Android version 18 on 2012-06-27
Not in Edge
In Firefox version 6 on 2011-08-16
In Firefox for Android version 6 on 2011-08-16
In Internet Explorer version 9 on 2011-03-14
In Quest Browser version 5.0 on undefined
In Opera version 11.6 on 2011-12-06
In Opera Android version 12 on 2012-02-25
In Safari version 3.1 on 2008-03-18
In Safari on iOS version 2 on 2008-07-11
In Samsung Internet version 1.0 on 2013-04-27
In WebView Android version 4.4 on 2013-12-09