chromium/third_party/blink/web_tests/fast/multicol/percent-height.html

<!DOCTYPE html>
<html>
    <head>
        <title>Resolving percent height inside multicol</title>
    </head>
    <body>
        <p>There should be a blue square below.</p>
        <div style="-webkit-columns:3; columns:3; -webkit-column-gap:0; column-gap:0; width:99px; height:99px;">
            <div style="height:300%; background:blue;"></div>
        </div>
    </body>
</html>