HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>registrations legacy</title>
</head>
<body>
  <button id="run">Try registrations()</button>
  <pre id="out">Click Try (registrations is deprecated — likely unsupported).</pre>
  <script>
    document.getElementById("run").addEventListener("click", function () {
      var out = document.getElementById("out");
      if (navigator.push && typeof navigator.push.registrations === "function") {
        var req = navigator.push.registrations();
        req.onsuccess = function () {
          if (req.result.length > 0) {
            req.result.forEach(function (r) {
              out.textContent += "\n" + r.pushEndpoint + " v" + r.version;
            });
          } else {
            out.textContent = "No existing registrations";
          }
        };
        req.onerror = function () { out.textContent = "registrations failed"; };
        return;
      }
      if (!window.isSecureContext || !("serviceWorker" in navigator)) {
        out.textContent = "registrations() not supported. Use getSubscription().";
        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" }));
      navigator.serviceWorker.register(url).then(function () {
        return navigator.serviceWorker.ready;
      }).then(function (registration) {
        if (typeof registration.pushManager.registrations === "function") {
          var r = registration.pushManager.registrations();
          r.onsuccess = function () { out.textContent = r.result.length + " registration(s)"; };
        } else {
          out.textContent = "registrations() not supported — use getSubscription()";
        }
        URL.revokeObjectURL(url);
      }).catch(function (err) {
        out.textContent = "Error: " + err.message;
        URL.revokeObjectURL(url);
      });
    });
  </script>
</body>
</html>
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registrations() — legacy list (Try It)
