chromium/chrome/test/data/chromeos/file_manager/cws_container_mock/index.html

<!doctype html>
<html>
  <head>
    <title>CWS Container (mock)</title>
    <script type="text/javascript" src="main.js"></script>
  </head>
  <body style="display: none">
    <div id="container">
      This is a mocked CWS Container.
    </div>
    <button onclick="javascript:onInstallButton();">Install</button>
  </body>
</html>