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<!DOCTYPE html>
<body>
<script>
function nextEvent(target, type) {
return new Promise((resolve, reject) => target.addEventListener(type, e => resolve(e), {once: true}));
}
onload = async function() {
const portal = document.createElement('portal');
portal.src = new URL('simple-portal.html', location.href);
document.body.appendChild(portal);
await nextEvent(portal, 'load');
let firedEvents = [];
for (let type of ['pagehide', 'unload']) {
nextEvent(window, type).then(() => {
firedEvents.push(type);
localStorage.setItem('predecessor-fires-unload-events', firedEvents.join(' '));
});
}
portal.activate();
};
</script>
</body>
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