On the standards track: Yes
Is Experimental: No
Is Deprecated: No
Not in Chrome
Not in Chrome Android
Not in Edge
In Firefox version 9 on 2011-12-20
In Firefox for Android version 9 on 2011-12-21
Not in Internet Explorer
Not in Quest Browser
Not in Opera
Not in Opera Android
In Safari version 5.1 on 2011-07-20
In Safari on iOS version 5 on 2011-10-12
Not in Samsung Internet
Not in WebView Android