<html>
    <head>
        <style>
            div::before { 
                display: table-column-group; 
                content: "Before Generated Content"
            }
        </style>
        <script>
            if (window.testRunner)
                testRunner.dumpAsText();
        </script>
    </head>
    <body>
        <div>
            PASS
        </div>
    </body>
</html>