On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 45 on 2015-09-01
In Chrome Android version 45 on 2015-09-01
In Edge version 12 on 2015-07-29
In Firefox version 20 on 2013-04-02
In Firefox for Android version 20 on 2013-04-02
Not in Internet Explorer
In Quest Browser version 5.0 on undefined
In Opera version 32 on 2015-09-15
In Opera Android version 32 on 2015-09-23
In Safari version 14.1 on 2021-04-26 Note: The CSSGroupingRule interface itself is not present, but many of the methods are available on various interfaces such as the CSSMediaRule and CSSPageRule interfaces.
In Safari on iOS version 14.5 on 2021-04-26 Note: The CSSGroupingRule interface itself is not present, but many of the methods are available on various interfaces such as the CSSMediaRule and CSSPageRule interfaces.
In Samsung Internet version 5.0 on 2016-12-15
In WebView Android version 45 on 2015-09-01
In WebView on iOS version 14.5 on 2021-04-26 Note: The CSSGroupingRule interface itself is not present, but many of the methods are available on various interfaces such as the CSSMediaRule and CSSPageRule interfaces.