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chromium/third_party/blink/web_tests/paint/invalidation/force-dark-mode-expected.html 

<!DOCTYPE html>
<script>
if (internals)
  internals.settings.setForceDarkModeEnabled(true);
</script>
<div style="width: 2000px; height: 2000px">
Text
  <div style="width: 200px; height: 200px; overflow: scroll; background: white">
    <div style="width: 2000px; height: 2000px">Scroller with white background</div>
  </div>
  <div style="width: 200px; height: 200px; overflow: scroll">
    <div style="width: 2000px; height: 2000px">Scroller with transparent background</div>
  </div>
</div>