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chromium/chrome/test/data/third_party_cookie.html 

<html><head><title>Third Party Cookies test</title></head>
<body>
<!-- This only works if the CrossSiteRedirector is running on the embedded test
     server, and the host_resolver is set up to handle b.com. -->
<iframe src="/set_cookie_header.html" id="frame1"></iframe>
<iframe src="/cross-site/b.com/set_cookie_header.html" id="frame2"></iframe>
</body></html>