[Webkit-unassigned] [Bug 172603] [WK2] Support onbeforeunload confirm panel in MiniBrowser

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172603

--- Comment #1 from Daniel Bates <dbates at webkit.org> ---
Created attachment 311266

  --> https://bugs.webkit.org/attachment.cgi?id=311266&action=review

Test case

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