<!DOCTYPE HTML>
<html>
<body>
  <script type="application/javascript">

function o() {
 var xhr = new XMLHttpRequest();
 xhr.open("GET", "sync_xhr_unload.sjs", false);
 try { xhr.send(); } catch(e) {}
}

window.addEventListener("beforeunload", o);
window.addEventListener("unload", o)

  </script>
</body>
</html>
