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

<!doctype html>
<!--
Copyright 2014 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>
  <title>WebViewed test content</title>
</head>

<body style="padding: 0; margin: 0;">
Nothing to see here.
</body>
</html>