"" />
        <meta name="assert" content="If the element has 'position: absolute', the containing block is established by the nearest positioned ancestor." />
        <style type="text/css">* { margin: 0; padding: 0 }
            #div1
            {
                border: solid black;
                margin: 50px;
                position: absolute;
                top: 0;
            }
            div div
            {
                height: 1in;
                width: 1in;
            }
