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chromium/chrome/test/data/ssl/page_with_many_subresources.html 

<html>
<head>
<title>This page has many subresources</title>
</head>
<body>
  <img src="/cross-site/a.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/b.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/c.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/d.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/e.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/f.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/g.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/h.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/i.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/j.test/ssl/google_files/logo1.gif"/>
  <img src="/cross-site/k.test/ssl/google_files/logo1.gif"/>
</body>
</html>