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<body>
<p>I will close myself if you close me.</p>
<script>
window.onbeforeunload = function() {
window.close();
};
</script>
</body>
<body>
<p>I will close myself if you close me.</p>
<script>
window.onbeforeunload = function() {
window.close();
};
</script>
</body>