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<!DOCTYPE html>
<script src="/common/utils.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<script src="/speculation-rules/prerender/resources/deferred-promise-utils.js"></script>
<script>
// The main test page loads the initiator page, then the initiator page will
// prerender itself with the `prerendering` parameter. The prerendered page will
// trigger a main frame navigation with the `navigation` parameter.
const params = new URLSearchParams(location.search);
const uid = params.get('uid');
const isPrerendering = params.has('prerendering');
const isNavigation = params.has('navigation');
if (isPrerendering && isNavigation) {
assert_true(document.prerendering);
const result = {
// Check the value of document.prerendering now and after activation.
prerenderingValueBeforeActivation: document.prerendering,
prerenderingValueAfterActivation: null,
// True if the prerenderingchange event is fired.
onprerenderingchangeCalled: false,
};
window.addEventListener('load', () => {
const prerenderChannel = new PrerenderChannel('prerender-channel', uid);
prerenderChannel.postMessage('readyToActivate');
prerenderChannel.close();
});
document.addEventListener('prerenderingchange', (e) => {
assert_false(document.prerendering);
const entry = performance.getEntriesByType('navigation')[0];
assert_greater_than_equal(entry.activationStart, 0,
'activationStart must be greater than 0')
result.onprerenderingchangeCalled = true;
result.prerenderingValueAfterActivation = document.prerendering;
const resultChannel = new PrerenderChannel('result', uid);
resultChannel.postMessage(result);
resultChannel.close();
window.close();
});
} else if (isPrerendering) {
assert_true(document.prerendering);
location.href = location.href + '&navigation';
} else {
assert_false(document.prerendering);
const prerenderingUrl = location.href + '&prerendering';
const prerenderChannel = new PrerenderChannel('prerender-channel', uid);
const readyToActivate = new Promise((resolve, reject) => {
prerenderChannel.addEventListener('message', e => {
if (e.data === 'readyToActivate') {
resolve();
} else {
reject(`The initiator page receives an unsupported message: ${e.data}`);
}
});
});
// Activate the page when prerendering is ready.
readyToActivate.then(() => {
window.location = prerenderingUrl.toString();
}).catch(e => {
const resultChannel = new PrerenderChannel('result', uid);
resultChannel.postMessage(
`Failed to navigate the prerendered page: ${e.toString()}`);
resultChannel.close();
window.close();
});
startPrerendering(prerenderingUrl);
}
</script>