   <meta name="assert" content="The 'solid' border is the dominant border when it is collapsed with a 'groove' border of the same size." />
        <style type="text/css">
            #table1
            {
                margin-bottom: 20px;
            }
            table
            {
                border-collapse: collapse;
            }
            td
            {
                border: 5px groove lime;
                height: 3em;
                width: 3em;
            }
            #center, #tab