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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Notification.permission</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var out = document.getElementById("out");
    if (!window.Notification) {
      out.textContent = "Notification API not available";
    } else if (Notification.permission === "granted") {
      out.textContent = "Notifications (and push) allowed";
    } else if (Notification.permission === "denied") {
      out.textContent = "Blocked";
    } else {
      out.textContent = "Not decided yet";
    }
  </script>
</body>
</html>

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Notification.permission — simple check (Try It)