[css-ui-4] test coverage

Author: frivoal

css-ui-4/Overview.bs

@@ -409,6 +409,10 @@ Outline Patterns: the 'outline-style' property</h3>
 	User agents may treat ''outline-style/auto'' as
 	''outline-style/solid''.
 
+	<wpt>
+		css/css-ui/outline-auto-width-001.html
+	</wpt>
+
 
 <h3 id="outline-color">
 Outline Colors: the 'outline-color' property</h3>