<!DOCTYPE html>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1290093">
<div style="columns:2;">
  <span style="position:relative;">
    <div style="position:absolute;"></div>
    <div id="spanner" style="column-span:all;"></div>
  </span>
</div>
<script>
  document.body.offsetTop;
  // This doesn't actually affect layout, but changing display type requires re-attach.
  spanner.style.display = "flow-root";
</script>
