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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>unregister legacy</title>
</head>
<body>
  <button id="run">Try unregister()</button>
  <pre id="out">Click Try (unregister is deprecated — likely unsupported).</pre>
  <script>
    document.getElementById("run").addEventListener("click", function () {
      var out = document.getElementById("out");
      var endpoint = "https://push.example.com/old-endpoint";
      if (navigator.push && typeof navigator.push.unregister === "function") {
        var req = navigator.push.unregister(endpoint);
        req.onsuccess = function () { out.textContent = "Unregistered: " + endpoint; };
        req.onerror = function () { out.textContent = "Unregister failed"; };
        return;
      }
      out.textContent = "unregister() not supported — use subscription.unsubscribe()";
    });
  </script>
</body>
</html>

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unregister() — legacy DOMRequest (Try It)