ed;
            }
            #div3
            {
                background: green;
                position: absolute;
                left: 0;
                top: 0;
            }
        </style>
    </head>
    <body>
        <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
        <div id="div1">
            <div id="div2"></div>
            <div id="div3"></div>
        </div>
    </body>
</html>