       span span
            {
                background: blue;
                height: 1in;
                position: absolute;
                width: 1in;
            }
        </style>
    </head>
    <body>
        <p>Test passes if the filled blue square is in the <strong>lower-right corner</strong> of the hollow black square.</p>
        <div>
            <span id="span1">
                <span></span>
            </span>
        </div>
    </body>
</html>