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<!DOCTYPE html>
<title>Prerendered iframe</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<body>
<script>
assert_true(document.prerendering);

const params = new URLSearchParams(location.search);
const uid = params.get('uid');

const bc = new PrerenderChannel('iframe-channel', uid);
bc.postMessage('prerender success');
bc.close();
</script>
</body>