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
In Edge version 12 on 2015-07-28
In Firefox version 36 on 2015-02-24
In Firefox for Android version 36 on 2015-02-27
In Internet Explorer version 5.5 on 2000-07-06
In Quest Browser version 5.0 on undefined
In Opera version 4 on 2000-06-28
In Opera Android version 14 on 2013-05-21
In Safari version 1 on 2003-06-23
In Safari on iOS version 1 on 2007-06-29
In Samsung Internet version 1.0 on 2013-04-27
In WebView Android version 37 on 2014-09-03