On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 9 on 2011-02-03
In Chrome Android version 18 on 2012-06-27
In Edge version 12 on 2015-07-28
In Firefox version 4 on 2011-03-22
In Firefox for Android version 4 on 2011-03-29
In Internet Explorer from the start
In Quest Browser version 5.0 on undefined
In Opera version 15 on 2013-07-02
In Opera Android version 14 on 2013-05-21
In Safari version 5.1 on 2011-07-20
In Safari on iOS version 5 on 2011-10-12
In Samsung Internet version 1.0 on 2013-04-27
In WebView Android version 4.4 on 2013-12-09