On the standards track: No
Is Experimental: No
Is Deprecated: Yes
Not in Chrome
Not in Chrome Android
Not in Edge
In Firefox version 3.6 on 2010-01-21
In Firefox for Android version 4 on 2011-03-29
Not in Internet Explorer
Not in Quest Browser
Not in Opera
Not in Opera Android
In Safari version 7 on 2013-10-22
In Safari on iOS version 7 on 2013-09-18
Not in Samsung Internet
Not in WebView Android
In WebView on iOS version 7 on 2013-09-18