[Webkit-unassigned] [Bug 188083] The instanceof operator does not work as expected for classes that extend CustomEvent or Event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188083

--- Comment #2 from Eugene Kashida <ekashida at gmail.com> ---
It seems to be working as expected in Firefox and Chrome, and Edge has the following open issue:
https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/11923584/

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