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chromium/third_party/blink/web_tests/fast/css-generated-content/margin-empty-content-expected.html 

<html>
    <head>
        <style>
            ul {
                list-style-type: none;
            }
            li {
                display: inline-block;
            }
            li:after {
                margin: 0 0 0 1px;
            }
        </style>
    </head>
    <body>
        <ul>
            <li>Should not wrap</li>
        </ul>
    </body>
</html>