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chromium/third_party/blink/web_tests/external/wpt/css/css-multicol/large-actual-column-count.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://www.w3.org/TR/css-multicol-1/#pseudo-algorithm">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="container" style="overflow:hidden; columns:1; column-fill:auto; column-gap:0; width:100px; height:100px; background:red;">
  <div style="height:300000px;"></div>
  <div style="width:100px; height:100px; background:green;"></div>
  <div style="height:123456px;"></div>
</div>
<script>
  document.getElementById("container").scrollLeft = 300000;
</script>