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

<!doctype html>
<!--
Copyright 2015 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html id='root' style="overflow-y: visible;">
  <!-- Since the body of an app is not scrollable by default, explicitly
       set it to be scrollable. -->
  <head>
    <script type="text/javascript" src="guest.js"></script>
  </head>
  <body style="margin: auto">
    Test guest.<br>
    Test guest.<br>
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    Test guest.<br>
    Test guest.<br>
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  </body>
</html>