rinsic height when an absolutely positioned replaced element with and intrinsic height with over-constrained values solves for 'bottom'.">
        <style type="text/css">
            #div1
            {
                border-top: solid black;
                position: relative;
            }
            div div
            {
                background: blue;
                height: 15px;
                left: 15px;
                position: absolute;
                top: 1in;
                width: 15px;
 