HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaNotify fallback</title>
  <style>
    body { font-family: system-ui, sans-serif; padding: 1.5rem; }
    #live { margin-top: 1rem; }
  </style>
</head>
<body>
  <button id="action">Add to cart</button>
  <div id="live" aria-live="polite"></div>
  <pre id="out"></pre>
  <script>
    function announce(el, message) {
      if (typeof el.ariaNotify === "function") {
        el.ariaNotify(message);
        return "ariaNotify";
      }
      var live = document.getElementById("live");
      live.textContent = "";
      requestAnimationFrame(function () {
        live.textContent = message;
      });
      return "aria-live";
    }

    var action = document.getElementById("action");
    var out = document.getElementById("out");

    action.addEventListener("click", function () {
      var msg = "Item added to cart.";
      var via = announce(action, msg);
      out.textContent = msg + "\n(via " + via + ")";
    });
  </script>
</body>
</html>

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Element.ariaNotify — live region fallback (Try It)