On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 1 on 2008-12-11 Note: Chrome only supports string values.
In Chrome Android version 18 on 2012-06-27 Note: Chrome Android only supports string values.
In Edge version 12 on 2015-07-29 Note: Edge only supports string values.
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 Note: Quest Browser only supports string values.
In Opera version ≤12.1 on undefined Note: Opera only supports string values.
In Opera Android version ≤12.1 on undefined Note: Opera only supports string values.
In Safari version 3.1 on 2008-03-18 Note: Safari only supports string values.
In Safari on iOS version 2 on 2008-07-11 Note: Safari on iOS only supports string values.
In Samsung Internet version 1.0 on 2013-04-27 Note: Samsung Internet only supports string values.
In WebView Android version 3 on 2011-02-22 Note: WebView only supports string values.
In WebView on iOS version 2 on 2008-07-11 Note: WebView on iOS only supports string values.