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 79 on 2020-01-15
In Firefox version 1 on 2004-11-09
In Firefox for Android version 4 on 2011-03-29
Not in Internet Explorer
In Quest Browser version 5.0 on undefined
Not in Opera
Not in Opera Android
In Safari version 5 on 2010-06-07
In Safari on iOS version 4.2 on 2010-11-22
In Samsung Internet version 1.0 on 2013-04-27
In WebView Android version 4.4 on 2013-12-09