On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 36 on 2014-07-16
In Chrome Android version 36 on 2014-07-16
In Edge version 12 on 2015-07-29
In Firefox version 16 on 2012-10-09
In Firefox for Android version 16 on 2012-10-09
Not in Internet Explorer
In Quest Browser version 5.0 on undefined
In Opera version 23 on 2014-07-22
In Opera Android version 24 on 2014-09-10
In Safari version 9 on 2015-09-30 Note: Before Safari 17, ::before and ::after pseudo elements were not included in the 3D rendering context (see bug 256430).
In Safari on iOS version 9 on 2015-09-16
In Samsung Internet version 3.0 on 2015-04-10
In WebView Android version 4.4 on 2013-12-09
In WebView on iOS version 9 on 2015-09-16