Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/fast/multicol/less-than-one-pixel-tall-layer-at-column-top.html 

<!DOCTYPE html>
<p>There should be a centered thin black line below.</p>
<div style="-webkit-columns:5; -webkit-column-gap:0; column-fill:auto; height:100px;">
    <div style="height:200px;"></div>
    <div style="position:relative; height:0.9px; background:black;"></div>
</div>