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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  Try to navigate away from this page.
</body>
</html>
 
body {
  font: bold 64px/1.1em helvetica, arial, sans-serif;
}
 
window.onbeforeunload = function(e) {
  return "Please don't leave";
};
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wilsonpagepro
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