[whatwg] prompts, alerts and showModalDialog during beforeunload/unload events

[Ojan Vafai]

Currently, modal dialogs that fire during beforeunload/unload events are
used to confuse users into not being able to leave websites (e.g. to tell
the user to click on the wrong button for in the browser's beforeunload
alert dialog). They also add a layer of complexity to browser shutdown
behavior. I can't think of any legitimate use-case for opening a modal
dialog when a user is trying to navigate away from a page.

Proposal: Opening a modal dialog during beforeunload/unload should either
throw an error or just silently fail.

Ojan
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