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chromium/third_party/blink/web_tests/external/wpt/css/css-multicol/crashtests/float-becomes-spanner.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1317656">
<div style="columns:2;">
  <div>
    <div id="elm" style="float:left;"></div>
  </div>
</div>
<script>
  document.body.offsetTop;
  elm.style.cssFloat = "none";
  elm.style.columnSpan = "all";
  document.body.offsetTop;
  elm.style.display = "none";
</script>