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chromium/third_party/blink/web_tests/fast/multicol/span/height-increase.html 

<!DOCTYPE html>
<script>
    onload = function() {
        document.body.offsetTop;
        document.getElementById('elm').style.height = '200px';
    }
</script>
<p>The word 'PASS' should be seen below.</p>
<div style="-webkit-columns:3; color:black; background:yellow;">
    <div style="-webkit-column-span:all; background:black;">
        <div id="elm"></div>
    </div>
    PASS
</div>