<!doctype html>
<html manifest="appcache.manifest">
<title>Iframe that will be cached using application cache.</title>
<meta charset='utf-8'>
<link rel='author' href='jarrydg@chromium.org' title='Jarryd Goodman'>
<script>
(async () => {
  const initPromise = new Promise(resolve => {
    applicationCache.addEventListener('cached', resolve);
    applicationCache.addEventListener('noupdate', resolve);
  });
  await initPromise;

  window.parent.postMessage('document cached');
})();
</script>
</html>