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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<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>