ference/ref-filled-black-96px-square.xht" />
        <meta name="assert" content="Integers can be preceded by '+'." />
        <style type="text/css">
            div
            {
                background: black;
                height: 0;
                height: +1in;
                width: 1in;
            }
        </style>
    </head>
    <body>
        <p>Test passes if there is a filled black square.</p>
        <div></div>
    </body>
</html>
