overlay-scrollbar-over-child-layer-nested.html

<!DOCTYPE html>
<meta name="fuzzy" content="maxDifference=0-255;totalPixels=0-3">
<script>
if (window.internals)
  internals.useMockOverlayScrollbars();
</script>
<div style="position: relative; width: 200px; height: 200px; overflow: scroll">
  <div style="position: relative; width: 210px; height: 80px; overflow: scroll">
    <div style="position: absolute; z-index: 5; background: green; width: 300px; height: 100px"></div>
  </div>
  <div style="height: 210px"></div>
</div>

chromium/third_party/blink/web_tests/scrollbars/overlay-scrollbar-over-child-layer-nested.html