On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 17 on 2012-02-08 Note: Until Chrome 46, content values weren't constrained to the values listed in the spec.
In Chrome Android version 18 on 2012-06-27 Note: Until Chrome Android 46, content values weren't constrained to the values listed in the spec.
In Edge version 79 on 2020-01-15
In Firefox version 36 on 2015-02-24 Note: The referrer value wasn't taken into account when navigation was happening via the context menu or middle click until Firefox 39.
In Firefox for Android version 36 on 2015-02-27 Note: The referrer value wasn't taken into account when navigation was happening via the context menu or middle click until Firefox for Android 39.
In Internet Explorer version 11 on 2013-10-17 Note: Browsers initially supported an early draft of the specification which can only use a meta tag and is only compatible with the origin value from the new spec.
In Quest Browser version 5.0 on undefined Note: Until Quest Browser 5.0, content values weren't constrained to the values listed in the spec.
In Opera version 15 on 2013-07-02 Note: Until Opera 33, content values weren't constrained to the values listed in the spec.
In Opera Android version 14 on 2013-05-21 Note: Until Opera Android 33, content values weren't constrained to the values listed in the spec.
In Safari version 11.1 on 2018-04-12
In Safari on iOS version 12 on 2018-09-17
In Samsung Internet version 1.0 on 2013-04-27 Note: Until Samsung Internet 5.0, content values weren't constrained to the values listed in the spec.
In WebView Android version 4.4 on 2013-12-09 Note: Until WebView Android 46, content values weren't constrained to the values listed in the spec.
In WebView on iOS version 12 on 2018-09-17