space.png');
            }
            #div2
            {
                margin-bottom: 2em;
            }
            #div3
            {
                margin-top: 2em;
            }
        </style>
    </head>
    <body>
        <p>Test passes if there is no red visible on the page.</p>
        <div id="div1">
            <div id="div2"></div>
            <div id="div3"></div>
        </div>
    </body>
</html>