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chromium/third_party/blink/web_tests/external/wpt/html/browsers/origin/origin-keyed-agent-clusters/iframe-navigation/parent-yes-1-no-same-2-no-subdomain.sub.https.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Parent is origin-keyed, navigate a frame from same-origin site-keyed to different-origin (subdomain) origin-keyed</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<script type="module">
import {
  insertIframe,
  navigateIframe,
  setBothDocumentDomains,
  testSameAgentCluster,
  testDifferentAgentClusters,
  testGetter
} from "../resources/helpers.mjs";

let frame1;
promise_setup(async () => {
  frame1 = await insertIframe("{{hosts[][]}}");
});

// Since the parent is origin-keyed, the same-origin child's non-request is
// ignored, so it gets origin-keyed too.

testSameAgentCluster([self, 0], "Before: parent to child");
testGetter(self, true, "before parent");
testGetter(0, true, "before child");

promise_test(async () => {
  await navigateIframe(frame1, "{{hosts[][www]}}");
  await setBothDocumentDomains(frames[0]);
}, "Navigation");

// Since the new page is different-origin, its non-request should be respected.

testDifferentAgentClusters([self, 0], "After: parent to child");
testGetter(self, true, "after parent");
testGetter(0, false, "after child");
</script>