n the value of the 'font-size' property itself, it uses the font size of the parent element." />
        <style type="text/css">* { margin: 0; padding: 0 }
            #div1
            {
                font-size: 3em;
            }
            #test
            {
                background: black;
                height: 1em;
                width: 1em;
            }
            div
            {
                font-family: Ahem;
                margin-top: 10px;
            }
        </