1 files changed, 33 insertions, 0 deletions
diff --git a/testing/web-platform/tests/speculation-rules/prerender/iframe-added-post-activation.html b/testing/web-platform/tests/speculation-rules/prerender/iframe-added-post-activation.html
new file mode 100644
index 0000000000..c4263db87d
--- /dev/null
+++ b/testing/web-platform/tests/speculation-rules/prerender/iframe-added-post-activation.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<!--
+Tests that an iframe added after activation starts out with
+document.prerendering false.
+-->
+<title>iframe added after activation</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="resources/utils.js"></script>
+<body>
+<script>
+
+setup(() => assertSpeculationRulesIsSupported());
+
+promise_test(async t => {
+  const uid = token();
+  const channel = new PrerenderChannel('test-channel', uid);
+  const messageQueue = new BroadcastMessageQueue(channel);
+  t.add_cleanup(_ => channel.close());
+
+  // Make the window to start the prerender.
+  const url = `resources/iframe-added-post-activation.html?uid=${uid}`;
+  window.open(url, '_blank', 'noopener');
+
+  // Wait for done.
+  const msg = await messageQueue.nextMessage();
+  assert_equals(msg, 'PASS');
+}, 'iframe added after activation has false document.prerendering');
+
+</script>
+</body>