Access: [6.1.1.3]: style sheets require testing (style attribute)
(Priority 1)

Cause:

If style sheets are used for formatting content and/or controlling page layout, be sure the information remains accessible when style sheets are disabled or not supported. Include a non-visual method of presenting the information and organize style sheets logically.

Testfile:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
	"http://www.w3.org/TR/REC-html40/loose.dtd">
<html lang="en">
<head>
<title>aert1.0/6.1.1</title>
</head>
<body>

<p style="color: green">hello</p>

</body>
</html>

References:

W3C WAI: http://www.w3.org/WAI//
HTML Techniques for WAI 1.0: http://www.w3.org/TR/WCAG10-HTML-TECHS/