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When a modal dialog is opened, w3c spec says: If any modal dialog box, such as those opened by on window.onbeforeunload or window.alert, is opened at any point in the page load, a response must be sent. What kind of response should be sent? Success or AnAlertOpened Error?
Discussed at the F2F in Sapporo *** This bug has been marked as a duplicate of bug 24816 ***