HTML Event attribute: onbeforeunload
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The HTML onbeforeunload attribute specifies the
event that is triggered just before a document is unloaded. It applies to <body> elements.
It can be used to return
a message if the user is just about to leave the page.
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head></head>
<body onbeforeunload="return myOnbeforeunload()">
onbeforeunload: try leaving page,
e.g. by following this link <a href="http://www.nematrian.com">nematrian homepage</a><br>
<script>
function myOnbeforeunload() {return "Page about to be unloaded";}
</script>
</body>
</html>
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