ts fallback to the default font family. The default font family varies and depends on user agent." />
        <style type="text/css">* { margin: 0; padding: 0 }
            div
            {
                font-family: UnknownFont;
            }
        </style>
    </head>
    <body>
        <p>PREREQUISITE: Operating system cannot have a font named "UnknownFont" installed. If it is installed remove it to verify this test.</p>
        <p>Test passes if there is a letter "X" below.</p>
        <