HTML attribute accesskey not working as it should

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-us">
<head>
    <title>Title</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <style type="text/css">
        a:focus{
            color:red
        }
    </style>
</head>
<body>
    <a accesskey="x" target="new" href="#">Hello</a>
</body>
</html>