On the standards track: Yes
Is Experimental: No
Is Deprecated: No
Not in Chrome
Not in Chrome Android
Not in Edge
In Firefox version 1 on 2004-11-09
In Firefox for Android version 4 on 2011-03-29
In Internet Explorer version 10 on 2012-10-26
Not in Quest Browser
Not in Opera
Not in Opera Android
In Safari version 4 on 2009-06-08
In Safari on iOS version 3.2 on 2010-04-03
Not in Samsung Internet
Not in WebView Android