[Webkit-unassigned] [Bug 169789] I found one more onbeforeunload event return value coercion edge case

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169789

Chris Dumez <cdumez at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |cdumez at apple.com

--- Comment #1 from Chris Dumez <cdumez at apple.com> ---
(In reply to comment #0)
> The newly-introduced test at
> http://w3c-test.org/html/browsers/browsing-the-web/unloading-documents/
> beforeunload-canceling.html named
> 
> > Returning false must not cancel the event, because it's coerced to the DOMString "false" which does not cancel CustomEvents: CustomEvent, cancelable
> 
> does not pass in Safari Tech Preview 25. Everything else does (except the
> test "Returning a string must not cancel the event: BeforeUnloadEvent with
> type "click", cancelable" which is fine since it's best if Safari doesn't
> implement createEvent("beforeunload"); see
> https://github.com/whatwg/dom/issues/362.)

I am not clear yet on what part of the spec says so.

I found:
https://html.spec.whatwg.org/#the-event-handler-processing-algorithm (step 5)

which says:
If return value is not null, then:
    1. Set E's canceled flag.
    ...

So if you return false, we cancel the event.

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