third_party_partitioned_cookies.html

<html>
  <head>
    <title>cross-site iframes with partitioned cookies</title>
    <script>
      function setCookie() {
        document.cookie = 'name=Good;';
      }
      </script>
  </head>
<body onload="setCookie();">
<!-- This only works if the CrossSiteRedirector is running on the embedded test
     server, and the host_resolver is set up to handle b.test and c.test. -->
<iframe src="/cross-site/b.test/partitioned_cookie.html" id="frame1"></iframe>
<iframe src="/cross-site/c.test/mixed_with_partitioned_cookie.html" id="frame2"></iframe>
<iframe src="/cross-site/d.test/set_cookie_header.html" id="frame3"></iframe>
</body></html>

chromium/chrome/test/data/third_party_partitioned_cookies.html