[css-sizing-4] Flex items are an exception to this note. Issue by dholbert

Author: fantasai

css-sizing-4/Overview.bs

@@ -104,9 +104,13 @@ Intrinsic Aspect Ratios: the 'aspect-ratio' property</h3>
 			of ''<var>width</var> / <var>height</var>''.
 	</dl>
 
-	Note: If a box has both a specified 'width' and a specified 'height',
+	Note: If a box has both a 'width' and a 'height'
+	that are not <a lt="automatic size">automatic</a>
+	(or, in the case of a <a>flex item</a>,
+	both a ''flex-basis/content'' flex basis and
+	a non-<a lt="automatic size">automatic</a> preferred <a>cross size</a>),
 	then the <a>preferred aspect ratio</a> has no effect:
-	at least one of these sizes must be ''width/auto''
+	at least one of these sizes must be ''width/auto'' (/''flex-basis/content'')
 	for the <a>preferred aspect ratio</a> to have an impact on sizing.
 
 	<div class="example">