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chromium/chrome/test/data/extensions/platform_apps/web_view/scrollable_embedder_and_guest/main.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 style="overflow-y: scroll;">
  <body style=
    "width: 400px; height: 400px; margin: 0px; padding: 0px;">
    <div id="webview-tag-container"></div>
    <script src="main.js"></script>
  </body>
</html>