ABCDEFGHIJKLMNOPQRSTUVWXYZ
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Handler Style
event.preventDefault()
event.returnValue = str
return strChromeFirefoxSafari
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addEventListenerxDialogDialogDialogBug 866818
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addEventListenerxDialogDialogDialog
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addEventListenerxNo DialogNo DialogNo DialogBug 809277
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addEventListenerxxDialogDialogDialog
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addEventListenerxxDialogDialogDialogBug 866818
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addEventListenerxxDialogDialogDialog
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addEventListenerxxxDialogDialogDialog
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onbeforeunloadxDialogDialogDialogBug 866818
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onbeforeunloadxDialogDialogDialog
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onbeforeunloadxDialogDialogDialog
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onbeforeunloadxxDialogDialogDialog
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onbeforeunloadxxDialogDialogDialog
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onbeforeunloadxxDialogDialogDialog
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onbeforeunloadxxxDialogDialogDialog
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Return typeChromeFirefoxSafari
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addEventListener
returnValue"Hello World"DialogDialogDialog
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addEventListener
returnValue""No dialogNo dialogNo dialogBug 1434509
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addEventListener
returnValuenullDialogDialogDialog
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addEventListener
returnValueundefinedDialogDialogDialog
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addEventListener
returnValueerrorDialogDialogDialog
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addEventListenerreturn"Hello World"No dialogNo dialogNo dialog
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addEventListener
return""No dialogNo dialogNo dialog
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addEventListener
returnnullNo dialogNo dialogNo dialog
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addEventListener
returnundefinedNo dialogNo dialogNo dialog
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addEventListener
returnerrorNo dialogNo dialogNo dialog
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onbeforeunloadreturnValue"Hello World"DialogDialogDialog
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onbeforeunloadreturnValue""No dialogNo dialogNo dialogBug 1434509
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onbeforeunloadreturnValuenullDialogDialogDialog
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onbeforeunloadreturnValueundefinedDialogDialogDialog
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onbeforeunloadreturnValueerrorDialogDialogDialog
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onbeforeunloadreturn"Hello World"DialogDialogDialog
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onbeforeunloadreturn""DialogDialogDialog
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onbeforeunloadreturnnullNo dialogNo dialogNo dialog
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onbeforeunloadreturnundefinedNo dialogNo dialogNo dialog
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onbeforeunloadreturnerrorDialogDialogDialog
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