<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <script>
      (async function () {
        await navigator.serviceWorker.register("file_service_worker.js");
        await navigator.serviceWorker.ready;
      })();
    </script>
  </head>
  <body>
    Service Worker Container
  </body>
</html>
