On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 10 on 2011-03-08
In Chrome Android version 18 on 2012-06-27
In Edge version 79 on 2020-01-15
In Firefox version 4 on 2011-03-22
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 10 on 2009-09-01
In Opera Android version 10.1 on 2010-11-09
In Safari version 5 on 2010-06-07
In Safari on iOS version 5 on 2011-10-12
In Samsung Internet version 1.0 on 2013-04-27
In WebView Android version 37 on 2014-09-03