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  <meta charset="utf-8">
  <title>setAppBadge — count</title>
</head>
<body>
  <pre id="out">Working…</pre>
  <script>
    async function setUnreadBadge(unread) {
      if (typeof navigator.setAppBadge !== "function") {
        return "Badging API not supported";
      }
      try {
        await navigator.setAppBadge(unread);
        return "Badge set to " + unread;
      } catch (err) {
        return "Error: " + err.name;
      }
    }
    setUnreadBadge(30).then(function (msg) {
      document.getElementById("out").textContent = msg;
    });
  </script>
</body>
</html>

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setAppBadge — unread count (Try It)