On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 71 on 2018-12-04
In Chrome Android version 71 on 2018-12-04
In Edge version 79 on 2020-01-15
In Firefox version 64 on 2018-12-11 Note: Before Firefox 44, Firefox incorrectly allowed elements inside a <frame> or <object> element to request, and to be granted, fullscreen. In Firefox 44 and onwards this has been fixed: only elements in the top-level document or in an <iframe> element with the allowfullscreen attribute can be displayed fullscreen.
In Firefox for Android version 64 on 2018-12-11 Note: Before Firefox for Android 44, Firefox for Android incorrectly allowed elements inside a <frame> or <object> element to request, and to be granted, fullscreen. In Firefox for Android 44 and onwards this has been fixed: only elements in the top-level document or in an <iframe> element with the allowfullscreen attribute can be displayed fullscreen.
In Internet Explorer version 11 on 2013-10-17
In Quest Browser version 6.0 on undefined
In Opera version 58 on 2019-01-23
In Opera Android version 50 on 2019-02-18
In Safari version 16.4 on 2023-03-27
In Safari on iOS version 16.4 on 2023-03-27 Note: Only available on iPad, not on iPhone. Shows an overlay button which can not be disabled. Swiping down exits fullscreen mode, making it unsuitable for some use cases like games. Only available on iPad, not on iPhone. Shows an overlay button which can not be disabled.
In Samsung Internet version 10.0 on 2019-08-22
In WebView Android version 71 on 2018-12-04
Not in WebView on iOS