HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>subscribe MDN</title>
</head>
<body>
  <button id="run">Subscribe</button>
  <pre id="out">Click Subscribe (needs HTTPS or localhost). May prompt for permission.</pre>
  <script>
    function urlBase64ToUint8Array(base64String) {
      var padding = "=".repeat((4 - (base64String.length % 4)) % 4);
      var base64 = (base64String + padding).replace(/-/g, "+").replace(/_/g, "/");
      var raw = atob(base64);
      return Uint8Array.from([].map.call(raw, function (c) { return c.charCodeAt(0); }));
    }
    document.getElementById("run").addEventListener("click", function () {
      var out = document.getElementById("out");
      if (!window.isSecureContext || !("serviceWorker" in navigator)) {
        out.textContent = "Need secure context + serviceWorker.";
        return;
      }
      var vapid = "BEl62iUYgUivxIkv69yViEuiBIa-Ib9-SkvMeAtA3LFgDzkrxZJjSgSnfckjBJuBkr3qBUYIHBQFLXYp5Nksh8U";
      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) {
        return registration.pushManager.subscribe({
          userVisibleOnly: true,
          applicationServerKey: urlBase64ToUint8Array(vapid)
        });
      }).then(function (subscription) {
        out.textContent = subscription.endpoint;
        URL.revokeObjectURL(url);
      }).catch(function (err) {
        out.textContent = "Error: " + err.message;
        URL.revokeObjectURL(url);
      });
    });
  </script>
</body>
</html>
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subscribe() — MDN pattern (Try It)
