BeforeUnloadEvent tests return false negative in Edge 15-18 #1666
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foolip
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Testing of Edge 15 and 18 was done in openwebdocs/mdn-bcd-collector#1666. Since it's supported in IE, assume that support goes back to Edge 12 here.
queengooborg
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Jul 14, 2024
Testing of Edge 15 and 18 was done in openwebdocs/mdn-bcd-collector#1666. Since it's supported in IE, assume that support goes back to Edge 12 here.
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I have tested https://mdn-bcd-collector.gooborg.com/tests/api/BeforeUnloadEvent in Edge 15 and 18 in BrowserStack. The issue most likely affects Edge 12-18.
The test returns false with "Cannot create event". However,
BeforeUnloadEventis defined and'returnValue' in BeforeUnloadEvent.prototypeis true, so the event interface is supported.Unlike other custom event tests, trying
new BeforeUnloadEvent('beforeunload')won't work, because Edge throws with "Function expected".I can't see a good way to write a test that will give the right result on all browsers, so filing this issue.
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