<!DOCTYPE html>
<meta charset="utf-8">
<title>Parent is isolated, child1 is not isolated, child1 navigates to a different site, child2 gets inserted and is isolated, child1 navigates back</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

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

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

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

// Since they're different-origin, the parent's isolation request is respected,
// as is the child's non-request. So the parent ends up in the origin-keyed
// agent cluster and the child ends up in the site-keyed one.
testDifferentAgentClusters([self, 0], "Before navigation: parent to child1");

// Navigate the iframe to a different site. These, of course, must not be in the
// same agent cluster.

promise_test(async () => {
  await navigateIframe(frame1, "{{hosts[alt][]}}");
}, "Navigation");

// Now insert a second iframe, pointing to the same place as the first one
// originally did, but this time with origin isolation enabled. Because of the
// historical map of agent cluster keys for the browsing context group, the new
// iframe should still end up in the site-keyed agent cluster.

promise_test(async () => {
  await insertIframe("{{hosts[][www]}}", "?1");
}, "Inserting a second iframe");

testDifferentAgentClusters([self, 1], "After navigation: parent to child2");

// Now navigate the first iframe back. The resulting Document should be put in
// the site agent cluster, together with the second iframe's Document.

promise_test(async () => {
  const waitPromise = waitForIframe(frame1);
  history.back();
  await waitPromise;

  await setBothDocumentDomains(frames[0]);
}, "Going back in history (navigating back the first iframe)");

testDifferentAgentClusters([self, 0], "After back: parent to child1");
testDifferentAgentClusters([self, 1], "After back: parent to child2");
testSameAgentCluster([0, 1], "child1 to child2");
testSameAgentCluster([1, 0], "child2 to child1");
</script>