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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
</head>
<body onbeforeunload="return beforeUnload()">
<a id="navigateAway" href="./hello.html">Click Me</a>
<a id="navigateAway2" href="./hello2.html">Click Me</a>
<script>
function beforeUnload() {
return "Please don't leave.";
}
</script>
</body>
</html>
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