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Test Info:

<!DOCTYPE html>
<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>