assert" content="If both 'margin-left' and margin-right' are computed as 'auto' their used value is as '0'." />
        <style type="text/css">* { margin: 0; padding: 0 }
            #div1
            {
                border: solid black;
                height: 2in;
                width: 2in;
            }
            img
            {
                background-color: blue;
                float: left;
                margin-left: auto;
                margin-right: auto;
                h