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chromium/chrome/test/data/extensions/api_test/tabs/capture_visible_tab/test_png/text.html 

<!--
Copyright 2011 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html>
  <body>
    Text should make some pixels not white.
  </body>
</html>