HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>unsubscribe modern</title>
</head>
<body>
  <button id="run">Unsubscribe</button>
  <pre id="out">Click Unsubscribe (needs HTTPS or localhost and existing subscription).</pre>
  <script>
    document.getElementById("run").addEventListener("click", async function () {
      var out = document.getElementById("out");
      if (!window.isSecureContext || !("serviceWorker" in navigator)) {
        out.textContent = "Need secure context + serviceWorker.";
        return;
      }
      var sw = "self.addEventListener('install',function(e){self.skipWaiting();});self.addEventListener('activate',function(e){e.waitUntil(self.clients.claim());});";
      var url = URL.createObjectURL(new Blob([sw], { type: "application/javascript" }));
      try {
        await navigator.serviceWorker.register(url);
        var registration = await navigator.serviceWorker.ready;
        var subscription = await registration.pushManager.getSubscription();
        if (!subscription) {
          out.textContent = "No subscription to unsubscribe";
          return;
        }
        var success = await subscription.unsubscribe();
        out.textContent = success ? "Push subscription removed" : "Unsubscribe returned false";
      } catch (err) {
        out.textContent = "Error: " + err.message;
      }
      URL.revokeObjectURL(url);
    });
  </script>
</body>
</html>

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subscription.unsubscribe() — modern (Try It)