iframe-big.html | Explore in Territory

<!DOCTYPE html>
<p>need something shows here.</p>
<p style="position: absolute; left: 1000px; top: 1000px;">make the iframe big enough</p>

<script>
window.addEventListener('message', (event) => {
  event.source.postMessage({}, '*');
});
</script>

chromium/third_party/blink/web_tests/http/tests/misc/resources/iframe-big.html