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chromium/chrome/test/data/extensions/platform_apps/web_view/download_cookie_isolation/guest.html 

<!DOCTYPE html>
<!--
Copyright 2016 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html>
  <head>
    <script src="guest.js"></script>
  </head>
  <body>
    <h1>Guest Page</h1>
    <div id="container"></div>
  </body>
</html>