onbeforeunload close tab

The onbeforeunload event occurs when the document is about to be unloaded. This event allows you to display a message in a confirmation dialog box to inform the user whether he/she wants to stay or leave the current page. The default message that appears

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    https://stackoverflow.com
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    onunload Event - W3Schools Online Web Tutorials
    https://www.w3schools.com
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    https://bugzilla.mozilla.org
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  • The onbeforeunload event occurs when the document is about to be unloaded. This event allo...
    onbeforeunload Event - W3Schools Online Web Tutorials
    https://www.w3schools.com
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    Window Close Event of Browser - CodeProject
    https://www.codeproject.com
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    https://developer.microsoft.co
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    https://social.msdn.microsoft.