HTML onbeforeunload Event Attribute

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Event attribute onbeforeunload</title>
</head>
<body onbeforeunload="myFunction()">
<p>Close this window, press F5 or click on the link below to trigger an event for onbeforeunload.</p>
<a href="https://www.cssportal.com">Go to CSSPortal.com</a>
<script>
function myFunction() {
    return "Are you sure you want to leave this page?";
}
</script>
</body>
</html>

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