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chromium/chrome/test/data/extensions/platform_apps/web_view/touch_accessibility/main.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>
  <style>
    body {
      border: 0;
      padding: 0;
      margin: 0;
    }
    webview {
      border: 0;
      padding: 0;
      margin: 50px 0 0 90px;
    }
  </style>
</head>
<body>
  <script src="main.js"></script>
</body>
</html>