     {
                height: 0;
            }
            #div1
            {
                border-bottom: 1ex solid black;
                margin-bottom: +7.5ex;
            }
            #div2
            {
                border-top: 1ex solid black;
            }
        </style>
    </head>
    <body>
        <p>Test passes if there is no red visible on the page.</p>
        <div id="wrapper">
            <div id="div1"></div>
            <div id="div2"></div>
        </div>
   