content-visibility-hidden-frame.html

<!DOCTYPE html>

<style>
iframe {
  width: 10px;
  height: 10px;
  border: none;
  padding: 0;
  margin: 0;
  position: absolute;
  top: 7px;
  left: 8px;
}
body {
  padding: 0;
  margin: 0;
  height: 200px;
}
</style>
<iframe id=frame style="content-visibility: hidden" srcdoc='<table> <marquee></marquee></table>'></iframe>

<script>
if (window.testRunner)
  testRunner.dumpAsLayout();
</script>

chromium/third_party/blink/web_tests/compositing/iframes/content-visibility-hidden-frame.html