Display confirmation message when user tries to close the browser in JavaScript

Question

I want to make inform the user by displaying a confirm message that Are you sure you want to close If he chooses OK then close else not How to do using Javascript

Mudassar · Accepted Answer

lthtml xmlns34httpwwww3org1999xhtml34gtlthead id34Head134 runat34server34gt    lttitlegtlttitlegt    ltscript type34textjavascript34gt                windowonbeforeunload  function return 39Are you sure39      ltscriptgtltheadgtltbodygt    ltform id34form134gt        This is a page to be closed    ltformgtltbodygtlthtmlgtDemo

Display confirmation message when user tries to close the browser in JavaScript

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