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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>register legacy</title>
</head>
<body>
  <button id="run">Try register()</button>
  <pre id="out">Click Try (register is deprecated — likely unsupported).</pre>
  <script>
    document.getElementById("run").addEventListener("click", function () {
      var out = document.getElementById("out");
      var pushApi = navigator.push;
      if (pushApi && typeof pushApi.register === "function") {
        var req = pushApi.register();
        req.onsuccess = function () {
          out.textContent = "New endpoint: " + req.result;
        };
        req.onerror = function (e) {
          out.textContent = "Error: " + (e.target.error || "register failed");
        };
        return;
      }
      if (!window.isSecureContext || !("serviceWorker" in navigator)) {
        out.textContent = "register() not supported. Use subscribe() after serviceWorker.ready.";
        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.register === "function") {
          var r = registration.pushManager.register();
          r.onsuccess = function () { out.textContent = "Endpoint: " + r.result; };
          r.onerror = function () { out.textContent = "register failed"; };
        } else {
          out.textContent = "register() not supported — use subscribe() instead";
        }
        URL.revokeObjectURL(url);
      }).catch(function (err) {
        out.textContent = "Error: " + err.message;
        URL.revokeObjectURL(url);
      });
    });
  </script>
</body>
</html>
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register() — legacy DOMRequest (Try It)
