CodePen Embed - onbeforeunload

<body onbeforeunload="return myFunction()">
<h1>The beforeunload Event</h1>

<p>Reload this page, or click on the link below to invoke the onbeforeunload event.</p>

<a href="https://codingislove.com">Click here to go to codingislove.com</a>
    
<script>
function myFunction() {
  event.preventDefault();
  return "";
}
</script>

</body>

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