      width: 100px;
            }
        </style>
    </head>
    <body>
        <p>Test passes if a filled blue square is in the <strong>upper-left corner</strong> of an hollow black square and if there is <strong>no red</strong>.</p>
        <div id="div1">
            <div>X</div>
        </div>
    </body>
</html>