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Test Info:

<!DOCTYPE html>
Tests for cross-origin iframes `document.prerendering` state.
This file cannot be upstreamed to WPT until:
* The specification describes the loading of cross-origin iframes. The test
expects that they are not loaded during prerendering.
<title>Load a cross-origin document in a prerendered iframe</title>
<meta name="variant" content="?target_hint=_self">
<meta name="variant" content="?target_hint=_blank">
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.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 bc = new PrerenderChannel('test-channel', uid);
const gotMessage = new Promise(resolve => {
bc.addEventListener('message', e => {
}, {
once: true
const url = `resources/cross-origin-iframe.html?uid=${uid}&target_hint=${getTargetHint()}`;, '_blank', 'noopener');
const result = await gotMessage;
const expected = [
event: 'started waiting iframe loaded',
prerendering: true
event: 'prerendering change',
prerendering: false
event: 'finished waiting iframe loaded',
prerendering: false
assert_equals(result.length, expected.length);
for (let i = 0; i < result.length; i++) {
assert_equals(result[i].event, expected[i].event, `event[${i}]`);
assert_equals(result[i].prerendering, expected[i].prerendering,
// Send a close signal to PrerenderEventCollector on the prerendered page.
new PrerenderChannel('close', uid).postMessage('');
}, `cross-origin iframes should not load until activation`);