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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="utils.js"></script>
<script>
// This file is loaded twice. First this is loaded as a page to trigger
// prerendering and then loaded as a prerendering page. The trigger page
// activates the prerendering page.
// Runs as the trigger page. This page starts prerendering and waits for signal
// from the prerendering page. After the signal, this page starts activation.
function runAsTriggerPage() {
assert_false(document.prerendering);
// Start prerendering.
const prerendering_url = location.href + '&prerendering=true';
startPrerendering(prerendering_url);
// Activate the prerendering page once it gets ready.
const bc = new PrerenderChannel('activation-ready');
bc.onmessage = () => { window.location = prerendering_url };
}
// Runs as prerendeirng page. First this page waits for the load event and
// signals to the trigger page for starting activation. Then, this page fires
// the prerenderingchange event and tests window.open() in the event.
function runAsPrerenderingPage() {
assert_true(document.prerendering);
window.onload = () => {
assert_true(document.prerendering);
// Notify the trigger page of activation ready.
const bc = new PrerenderChannel('activation-ready');
bc.postMessage('ready for activation');
}
new PrerenderChannel('close').addEventListener('message', () => {
window.close();
});
document.onprerenderingchange = () => {
assert_false(document.prerendering);
// Attempt to open a window in the prerenderingchange event.
const win = window.open('empty.html', '_blank');
// Send the result to the test runner page.
const bc = new PrerenderChannel('result');
if (win) {
bc.postMessage('opened');
win.close();
} else {
bc.postMessage('failed to open');
}
};
}
if (new URLSearchParams(location.search).has('prerendering')) {
runAsPrerenderingPage();
} else {
runAsTriggerPage();
}
</script>