mock-scrollbars-expected.html | Explore in Territory

<!DOCTYPE html>
<script>
  if (window.internals)
    internals.useMockOverlayScrollbars();
  onload = ()=> {
    child.style.display = "block";
  }
</script>
<style>body { overflow:hidden; }</style>
<p>The scrollable container below should not appear to be scrollable.</p>
<div id="child" style="display:none; overflow:scroll; width:200px; height:200px;">
  <div style="box-sizing:border-box; border:solid; width:100%; height:100%;"></div>
</div>

chromium/third_party/blink/web_tests/scrollbars/mock-scrollbars-expected.html