[css-flexbox] Add more rationale for flex-basis dependency removal on min-size: auto

Author: fantasai

css-flexbox/Overview.bs

@@ -3160,7 +3160,9 @@ Substantive Changes and Bugfixes</h4>
 
 		<li id="change-201409-min-auto-specified-size">
 			Remove the requirement that the <a>flex basis</a> be ''content'' for the <a>specified size</a> to be defined.
-			(The specified size should always win if it is smaller than the intrinsic size.)
+			(The specified size should always win if it is smaller than the intrinsic size.
+			This is particularly important to maintain author expectations for,
+			e.g. <code>&lt;img src="&hellip;" width=40 height=40 title="100x100 image"&gt;</code>.)
 
 			<blockquote>
 				If the item’s <del>computed 'flex-basis' is ''content''