HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>document.ariaNotify priority</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;}</style>
</head>
<body>
  <button id="alert">Simulate session expiry</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("alert").addEventListener("click", function () {
      var msg = "Session expired. Please sign in again.";
      if (typeof document.ariaNotify === "function") {
        document.ariaNotify(msg, { priority: "high" });
        document.getElementById("out").textContent = "Queued (high): " + msg;
      } else {
        document.getElementById("out").textContent = "Not supported: " + msg;
      }
    });
  </script>
</body>
</html>

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Document.ariaNotify — high priority (Try It)