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 15 on 2017-04-05
In Firefox version 1.5 on 2005-11-29
In Firefox for Android version 4 on 2011-03-29
Not in Internet Explorer
In Quest Browser version 5.0 on undefined
In Opera version 9.5 on 2008-06-12
In Opera Android version 14 on 2013-05-21
In Safari version 1.2 on 2004-02-02
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