<!DOCTYPE html>
<html>
    <head>
        <title>Leading and trailing margin</title>
    </head>
    <body>
        <p>There should be no scrollbars.</p>
        <div style="-webkit-columns:3; columns:3;">
            <div style="margin-top:1em; margin-bottom:10em;">&nbsp;</div>
        </div>
    </body>
</html>