child-move-reveals-parent-background-ref.html

<!DOCTYPE html>
<style>
  #parent {
    width: 150px;
    height: 150px;
    background-color: green;
  }
</style>
<p>There should be a green square below.</p>
<div id="parent"></div>

chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/child-move-reveals-parent-background-ref.html