<html>
    <head>
        <script>
            if (window.testRunner)
                testRunner.dumpAsText();
        </script>
    </head>
    <style>
    div { 
        border: 5px solid maroon; 
        -webkit-column-count: 2;
        margin: 1em 0;
    }
    summary { 
        -webkit-column-span: all;
        background-color: #eeeeee;
        color: black;
    }
    </style>
    <body onload="document.open(); document.write('PASS, does not crash'); document.close();">
        <div>
            <label>AAA
            <summary>BBB
        </div>
    </body>
</html>