clip-path-on-fixed-position-scroll-ref.html

<!DOCTYPE html>
<style>
.ref {
  height: 100px;
  width: 100px;
  background: green;
}
</style>
<div style="height: 800px"></div>
<div class="ref"></div>
<script>
onload = () => {
  window.scrollTo(0, 800);
};
</script>

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