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<!DOCTYPE html>
<html>
<body onbeforeunload="return myFunction()">
​
<p>Close this window, press F5 or click on the link below to invoke the onbeforeunload event.</p>
​
<a href="../index.html">Click here to go to w3schools.com</a>
  
<script>
function myFunction() {
  return "Write something clever here...";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/tags/tryit.asp?filename=tryhtml5_ev_onbeforeunload by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:09:25 GMT -->
</html>
​
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