On the standards track: Yes
Is Experimental: Yes
Is Deprecated: No
In Chrome version 121 on 2024-01-23
In Chrome Android version 121 on 2024-01-23
In Edge version 121 on 2024-01-25
Not in Firefox
Not in Firefox for Android
Not in Internet Explorer
Not in Quest Browser
In Opera version 107 on 2024-02-07
In Opera Android version 81 on 2024-03-14
In Safari version 26.2 on 2025-12-12 Note: Only conservative is supported for document rules (though moderate automatically falls back to conservative). Only eager and immediate is supported for list rules.
In Safari on iOS version 26.2 on 2025-12-12 Note: Only conservative is supported for document rules (though moderate automatically falls back to conservative). Only eager and immediate is supported for list rules.
In Samsung Internet version 25.0 on 2024-04-24
In WebView Android version 121 on 2024-01-23
Not in WebView on iOS