Navigating away from a page with an unload user prompt

[elliterate]

If user prompts spawned in beforeunload event handlers are always dismissed and dismissal means preferring the "Cancel" action, doesn't that mean one would be unable to leave such a page?

[whimboo]

Duplicate of #1294.

[elliterate]

Duplicate of #1294.

@whimboo I’m not sure if it’s quite the same. #1294 seems to want a way to allow the handler to block (that is, to be fully exercised) whereas I would argue for there to be a way to (optionally?) force its dismissal (e.g., in tests, where it could prevent test cleanup). Those seem like they might be related but independent concerns.

[whimboo]

Our handling of beforeunload prompts is currently not great and we need to improve. As such please add a comment to the other issue and I'm happy to adjust the summary to match all aspects. We will discuss this topic soon in a WG meeting.