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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/clip-path/clip-path-fixed-scroll-ref.html 

<!doctype html>
<div style="height: 100vh"></div>
<div style="width: 200px; height: 200px; background: green"></div>
<script>
  window.scrollTo(0, 1000);
</script>