ancestor-chain-cross-site-embed.html

<!doctype html>
<head>
<meta charset="utf-8"/>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/cookies/resources/testharness-helpers.js"></script>
<title>Test partitioned cookies ancestor chain: cross site embed</title>
</head>
<body>
<script>

test(() => {
  const iframe = document.createElement("iframe");
  const url = new URL(
    "/cookies/partitioned-cookies/resources/" +
        "ancestor-chain-same-site-embed.html",
    `https://${ORIGINAL_HOST}:${window.location.port}`);
  iframe.src = url.href;
  document.body.appendChild(iframe);
  fetch_tests_from_window(iframe.contentWindow);
}, "Cross-site embed opened");

</script>
</body>

chromium/third_party/blink/web_tests/http/tests/cookies/partitioned-cookies/resources/ancestor-chain-cross-site-embed.html