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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>sendBeacon — hide</title>
</head>
<body>
  <p>Switch tabs or minimize to fire visibilitychange.</p>
  <pre id="out">Listening for visibilitychange…</pre>
  <script>
    var analyticsData = "session=end&ts=" + Date.now();
    var out = document.getElementById("out");
    document.addEventListener("visibilitychange", function () {
      if (document.visibilityState === "hidden") {
        var ok = navigator.sendBeacon("/log", analyticsData);
        out.textContent = "beacon on hide queued: " + ok;
      }
    });
  </script>
</body>
</html>

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sendBeacon — visibilitychange (Try It)