HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasPermission UI</title>
</head>
<body>
  <button id="run">Check permission</button>
  <pre id="out">Click Check (needs HTTPS or localhost).</pre>
  <script>
    document.getElementById("run").addEventListener("click", function () {
      var out = document.getElementById("out");
      function labelFor(status) {
        if (status === "granted") return "Disable Push Messages";
        if (status === "denied") return "Push Blocked";
        return "Enable Push Messages";
      }
      if (!window.Notification) {
        out.textContent = "Notification API not available";
        return;
      }
      out.textContent = labelFor(Notification.permission === "default" ? "default" : Notification.permission);
    });
  </script>
</body>
</html>

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hasPermission() — UI branch (Try It)