tests/wpt/web-platform-tests/css/css-multicol/multicol-overflow-clip-positioned.html

<!DOCTYPE html>
<title>CSS Multi-column Layout Test: multicol with overflow-clipped positioned content</title>
<link rel="help" href="https://www.w3.org/TR/css-multicol-1/">
<link rel="match" href="multicol-overflow-clip-positioned-ref.html">
<meta name="assert" content="Overflow clip for positioned content should work under multicol.">
<div style="columns: 2">
  <div style="height: 200px; overflow: hidden">
    <div style="height: 800px; background: blue; position: relative"></div>
  </div>
  <div style="height: 200px"></div>
</div>