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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>clearAppBadge — safe</title>
</head>
<body>
  <pre id="out">Working…</pre>
  <script>
    async function clearBadgeSafe() {
      if (typeof navigator.clearAppBadge !== "function") {
        return { ok: false, reason: "unsupported" };
      }
      if (!window.isSecureContext) {
        return { ok: false, reason: "insecure-context" };
      }
      try {
        await navigator.clearAppBadge();
        return { ok: true, reason: "cleared" };
      } catch (err) {
        return { ok: false, reason: err.name };
      }
    }
    clearBadgeSafe().then(function (result) {
      document.getElementById("out").textContent = JSON.stringify(result);
    });
  </script>
</body>
</html>

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clearAppBadge — safe helper (Try It)