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chromium/third_party/blink/web_tests/external/wpt/css/css-position/hypothetical-box-scroll-viewport-ref.html 

<!doctype html>
<meta charset=utf-8>
<div>Modified text</div>
<div style="width: 200vw; height: 10px"></div>
<script>
  window.scrollTo(window.innerWidth * 2, 0);
</script>