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

<!DOCTYPE html>
<meta charset="utf-8">
<title>Parent is site-keyed, navigate a frame from a subdomain site-keyed to the same 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,
  testGetter
} from "../resources/helpers.mjs";

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

// Nobody requested origin-keying yet.

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

promise_test(async () => {
  await navigateIframe(frame1, "{{hosts[][www]}}", "?1");
  await setBothDocumentDomains(frames[0]);
}, "Navigation");

// Because this subdomain was previously site-keyed, the second load's
// origin-keying request is ignored; instead we continue with site-keying.

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