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
Not in Firefox
Not in Firefox for Android
In Internet Explorer version 9 on 2011-03-14
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 1.1 on 2003-10-24
Not in Safari on iOS
In Samsung Internet version 1.0 on 2013-04-27
In WebView Android version 37 on 2014-09-03