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 52 on 2017-03-07
In Firefox for Android version 52 on 2017-03-07
In Internet Explorer version 5 on 1999-03-18
In Quest Browser version 5.0 on undefined
In Opera version 15 on 2013-07-02
In Opera Android version 14 on 2013-05-21
In Safari version 1.3 on 2005-04-15
Not in Safari on iOS
In Samsung Internet version 1.0 on 2013-04-27
In WebView Android version 4.4 on 2013-12-09