org/TR/CSS21/box.html#border-width-properties" />
        <meta name="flags" content="ahem invalid" />
        <meta name="assert" content="The 'border-right-width' property does not support a negative length value in 'em' units and resets to the initial value." />
        <style type="text/css">* { margin: 0; padding: 0 }
            div
            {
                border-right-style: solid;
                font: 20px/1 Ahem;
                height: 1in;
                width: 0;
            }
