            }
            #pre3
            {
                margin-left: 1em;
            }
            #pre2, #pre3
            {
                background: black;
                display: inline-block;
                height: 1em;
                width: 2em;
            }
        </style>
    </head>
    <body>
        <p>Test passes if there are only two boxes below.</p>
        <pre id="pre1">XX   XX</pre>
        <pre id="pre2"></pre><pre id="pre3"></pre>
    </body>
</html>