The onbeforeunload event attribute is triggered when the document is ready to be unloaded.
You can try running the following code to implement the onbeforeunload attribute −
<!DOCTYPE html>
<html>
<body onbeforeunload = "return display()">
<p>Close this window or press F5.</p>
<script>
function display() {
return "Wanna stay here or leave?";
}
</script>
</body>
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