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chromium/third_party/blink/web_tests/paint/invalidation/scroll/fixed-under-composited-fixed-scrolled-expected.html 

<!DOCTYPE html>
<script>
onload = function() { window.scrollTo(0, 400); }
</script>
<style>
body {
  height: 2000px;
  background-color: green;
}
</style>