On the standards track: Yes
Is Experimental: No
Is Deprecated: No
Not in Chrome
Not in Chrome Android
Not in Edge
In Firefox version 8 on 2011-11-08
In Firefox for Android version 8 on 2011-11-08
Not in Internet Explorer
Not in Quest Browser
Not in Opera
Not in Opera Android
In Safari version 9.1 on 2016-03-21
In Safari on iOS version 9.3 on 2016-03-21
Not in Samsung Internet
Not in WebView Android