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

<!--
Copyright 2018 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>
  <style>
    html,body {
     height: 100%;
    }
  </style>
</head>
<body>
  <p>Hello.</p>
  <script src="guest.js"></script>
</body>
</html>