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chromium
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chromium/content/test/data/cookies/page_with_subresource.html 

<html>
<head></head>
<body>
  <p>This is a page with a simple subresource (image), which can be used to test that appropriate cookies are attached to the subresource request.
  <img src="image_without_set_cookie.jpg"/>
</body>
</html>