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<!DOCTYPE html> <html> <body onbeforeunload="return myFunction()"> <h1>HTML DOM Events</h1> <h2>The beforeunload Event</h2> <p>Reload this page, or click on the link below to invoke the onbeforeunload event.</p> <a href="">Click here to go to w3schools.com</a> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>