scroll-background-obscured-expected.html

<!doctype HTML>
<div id="target" style="height: 100%; overflow-y:scroll; background-color: yellow; width: 200px; height: 200px;">
  <div style="width: 200px; height: 400px;"></div>
</div>
<script>
target.scrollTop = 200;
</script>

chromium/third_party/blink/web_tests/paint/overflow/scroll-background-obscured-expected.html