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chromium/third_party/blink/web_tests/fast/multicol/resize-container-with-column-rule-child-expected.html 

<!DOCTYPE html>
<p>There should be two black vertical lines below.</p>
<div style="width:604px; height:100px;">
    <div style="float:left; width:200px; height:100%; background:white; border-right:2px solid;"></div>
    <div style="float:left; width:200px; height:100%; background:white; border-right:2px solid;"></div>
    <div style="float:left; width:200px; height:100%; background:white;"></div>
</div>