1 files changed, 40 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/browsers/origin/origin-keyed-agent-clusters/iframe-navigation/parent-no-1-no-subdomain-2-yes-subdomain.sub.https.html b/testing/web-platform/tests/html/browsers/origin/origin-keyed-agent-clusters/iframe-navigation/parent-no-1-no-subdomain-2-yes-subdomain.sub.https.html
new file mode 100644
index 0000000000..803e684e1c
--- /dev/null
+++ b/testing/web-platform/tests/html/browsers/origin/origin-keyed-agent-clusters/iframe-navigation/parent-no-1-no-subdomain-2-yes-subdomain.sub.https.html
@@ -0,0 +1,40 @@
+<!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>