css21/syntax/uri-010.xht

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>CSS Test: Invalid character (_) before URL functions</title>
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
        <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#uri" />
        <link rel="match" href="../reference/no-red-filler-text-ref.xht"/>
        <meta name="flags" content="image invalid" />
        <meta name="assert" content="An underscore character preceding URL string invalidates the entire url assignment." />
        <style type="text/css">
            div
            {
                background: url(_"support/red_box.png");
            }
        </style>
    </head>
    <body>
        <p>Test passes if there is no red visible on the page.</p>
        <div>Filler Text</div>
    </body>
</html>