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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="/common/get-host-info.sub.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<script src="/speculation-rules/prerender/resources/deferred-promise-utils.js"></script>
<body>
<script>
async function main() {
// Start loading a sandbox iframe, which is treated as cross-origin iframe.
// The iframe messages us with the value of its document.prerendering,
// which should be false since load is delayed until after activation.
const sandboxIframe = document.createElement('iframe');
sandboxIframe.sandbox = 'allow-scripts';
const gotMessage = new Promise((resolve, reject) => {
window.addEventListener('message', (e) => {
if (e.data === 'document.prerendering: false')
resolve();
else
reject('bad message: ' + e.data);
});
});
sandboxIframe.src = 'post-message-prerendering-completion-notification.html';
document.body.appendChild(sandboxIframe);
// To give the test a chance to fail by giving enough time if it loads the
// cross-origin iframe instead of deferring, wait for a same-origin iframe to
// load before proceeding with the test.
await createFrame('empty.html');
// Start the event collector to trigger activation.
const prerenderEventCollector = new PrerenderEventCollector();
prerenderEventCollector.start(gotMessage, 'iframe loaded');
}
// The main test page (prerender/sandbox-iframe.html) loads the initiator
// page, then the initiator page will prerender itself with the
// `prerendering` parameter.
const params = new URLSearchParams(location.search);
if (!params.has('prerendering')) {
loadInitiatorPage();
} else {
main();
}
</script>
</body>
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