<!DOCTYPE html>
<html>
    <head>
        <title>Nested spanner (not allowed)</title>
    </head>
    <body>
        <p>There should be nothing below.</p>
        <div style="-webkit-columns:6; columns:6; -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>