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<!DOCTYPE html>
<title>BroadcastChannel#postMessage is deferred</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 bc = new PrerenderChannel('test-channel', uid);
t.add_cleanup(_ => bc.close());
const gotMessage = new Promise(resolve => {
bc.addEventListener('message', e => {
resolve(e.data);
}, {
once: true
});
});
const url = `resources/broadcast-channel.html?uid=${uid}`;
window.open(url, '_blank', 'noopener');
const result = await gotMessage;
const expected = [
{
event: 'started waiting BroadcastChannel',
prerendering: true
},
{
event: 'prerendering change',
prerendering: false
},
{
event: 'received message: hello',
prerendering: false
},
{
event: 'finished waiting BroadcastChannel',
prerendering: false
},
];
assert_equals(result.length, expected.length);
for (let i = 0; i < result.length; i++) {
assert_equals(result[i].event, expected[i].event, `event${i}`);
assert_equals(result[i].prerendering, expected[i].prerendering,
`prerendering${i}`);
}
// Send a close signal to PrerenderEventCollector on the prerendered page.
new PrerenderChannel('close', uid).postMessage('');
}, `BroadcastChannel#postMessage should be deferred until the prerendered ` +
`page is activated`);
</script>
</body>
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