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<!doctype html>
<!--
Tests for about:blank iframes `document.prerendering` state
and prerenderingchange event.
-->
<title>Test about:blank iframes prerendering state</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 gotMessage = new Promise(resolve => {
channel.addEventListener('message', e => {
resolve(e.data);
}, {once: true});
});
// Make the window to start the prerender.
const url = `resources/about-blank-iframes.html?uid=${uid}`;
window.open(url, '_blank', 'noopener');
const msg = await gotMessage;
assert_equals(msg, 'PASS');
}, 'about:blank iframes');
</script>
</body>
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