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Test Info:

<!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>
<script src="resources/utils.js"></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}`;, '_blank', 'noopener');
// Wait for done.
const msg = await messageQueue.nextMessage();
assert_equals(msg, 'PASS');
}, 'iframe added after activation has false document.prerendering');