ote characters appearing in an unquoted URI need to be escaped with a backslash so that the resulting URI value is a URI token." />
        <style type="text/css">* { margin: 0; padding: 0 }
            div
            {
                background: red url(support/\'green\ block.png);
            }
        </style>
    </head>
    <body>
        <p>Test passes if the box below is green.</p>
        <div>Filler Text</div>
    </body>
</html>