On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 3 on 2009-09-15
In Chrome Android from the start
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 version 9 on 2011-03-14
In Quest Browser from the start
In Opera from the start
In Opera Android from the start
In Safari version 3.1 on 2008-03-18
In Safari on iOS version 3 on 2009-06-17
In Samsung Internet from the start
In WebView Android from the start