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chromium/third_party/blink/web_tests/fast/multicol/nested-with-single-empty-block-expected.html 

<!DOCTYPE html>
<p>There should be three vertical lines below.</p>
<div style="height:50px;">
    <div style="float:left; height:100%; width:50px; padding-right:3px; border-right:3px solid;"></div>
    <div style="float:left; height:100%; width:50px; padding:0 3px; border-right:3px solid;"></div>
    <div style="float:left; height:100%; width:50px; padding:0 3px; border-right:3px solid;"></div>
</div>