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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $(window).unload(function(){ alert("Goodbye!"); }); }); </script> </head> <body> <p>When you click <a href="../../w3schools.com/index.html">this link</a>, or close the window, an alert box will be triggered.</p> </body> </html>