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<!DOCTYPE html> <html lang="en"> <head> <script> window.addEventListener('beforeunload', function (event) { var message = "Are you sure you want to close this page?"; event.returnValue = message; }); </script> </head> <body> <h2>How to Handle Browser Close Event in Javascript</h2> <input type="text" value="Enter Some Things" id="inputString"><br><br> </body> </html>