chromium/chrome/test/data/banners/nested_sw_test_page_empty_fetch_handler.html

<html>
  <head>
    <title>Web app banner test page</title>
    <script src="main.js"></script>
    <script>
      // If a "manifest=/path/to/manifest.json" query argument is provided to
      // the URL accessing this page, that path is injected as the manifest tag.
      // Otherwise, "manifest.json" is used as the manifest tag.
      addManifestLinkTag();
    </script>
    <script>
      // Register page scoped service worker.
      navigator.serviceWorker.register('service_worker_with_no_fetch_handler.js',
        { scope: 'nested_sw_test_page_empty_fetch_handler.html' });

      // Register app scoped service worker.
      navigator.serviceWorker.register('service_worker_empty_fetch_handler.js');
    </script>
  </head>
  <body onload="initialize()">
    Service worker returns a response object, so the page works well offline.
  </body>
</html>