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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
html { columns:2; }
</style>
<div style="height:100px;"></div>
<script>
document.body.offsetTop;
document.body.style.columnSpan = "all";
document.documentElement.style.writingMode = "vertical-rl";
</script>