<!DOCTYPE html>
<html>
    <head>
        <title>Nested spanner (not allowed)</title>
        <script>
            function test() {
                var elm = document.getElementById('elm');
                elm.offsetTop; // trigger layout
                elm.style.WebkitColumns = '6';
                elm.style.columns = '6';
            }
        </script>
    </head>
    <body onload="test()">
        <p>There should be nothing below.</p>
        <div id="elm" style="-webkit-column-gap:0; column-gap:0; width:4em; overflow:hidden;">
            <div style="-webkit-column-span:all; column-span:all; padding-left:4em;">
                <div style="-webkit-column-span:all; column-span:all;">
                    FAIL
                </div>
            </div>
        </div>
    </body>
</html>