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

<html>
  <head>
    <title>Web app banner test page</title>
    <script src="main.js"></script>
    <link rel="manifest" href="manifest_with_id.json">
  </head>
  <body onload="initializeWithWorker('service_worker.js')">
    Service worker returns a response object if it's offline, so the page
    supports the offline environment.
  </body>
</html>