[Webkit-unassigned] [Bug 169789] New: 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

            Bug ID: 169789
           Summary: I found one more onbeforeunload event return value
                    coercion edge case
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d at domenic.me

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.)

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