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<head>
  <meta charset="utf-8">
  <title>sendBeacon — basic</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function pingAnalytics() {
      if (typeof navigator.sendBeacon !== "function") {
        return "sendBeacon not supported";
      }
      var queued = navigator.sendBeacon("/analytics", "event=page_ping");
      return "queued: " + queued;
    }
    document.getElementById("out").textContent = pingAnalytics();
  </script>
</body>
</html>

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sendBeacon — basic string (Try It)