On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 80 on 2020-02-04
In Chrome Android version 80 on 2020-02-04
In Edge version 80 on 2020-02-07
In Firefox version 65 on 2019-01-29
In Firefox for Android version 65 on 2019-01-29
Not in Internet Explorer
In Quest Browser version 9.0 on undefined
In Opera version 67 on 2020-03-03
In Opera Android version 57 on 2020-03-30
In Safari version 16.4 on 2023-03-27 Note: Although the onmessageerror event handler property is supported, the messageerror event is never fired.
In Safari on iOS version 16.4 on 2023-03-27 Note: Although the onmessageerror event handler property is supported, the messageerror event is never fired.
In Samsung Internet version 13.0 on 2020-12-02
In WebView Android version 80 on 2020-02-04
Not in WebView on iOS