[css-sizing-3] Clean up wording in rules for determining intrinsic sizes to make correspondences clear. #2128

Author: fantasai

css-sizing-3/Overview.bs

@@ -694,16 +694,28 @@ Intrinsic Size Determination</h2>
 Intrinsic Sizes</h3>
 
 	The <a>min-content size</a> of a box in each axis
-	is the size it would have as an
-	''width/auto''-sized (in that axis) float in a zero-sized containing block.
+	is the size it would have if it were
+	a float given an ''width/auto'' size in that axis
+	(and no <a lt="min size">minimum</a> or <a>maximum size</a> in that axis)
+	and whose containing block was <em>zero</em>-sized in that axis.
 	(In other words, the minimum size it has when sized as “shrink-to-fit”.)
 
 	The <a>max-content size</a> of a box in each axis
-	is the size it would have as an
-	''width/auto''-sized (in that axis) float in an infinitely-sized containing block.
+	is the size it would have if it were
+	a float given an ''width/auto'' size in that axis
+	(and no <a lt="min size">minimum</a> or <a>maximum size</a> in that axis),
+	and whose containing block was <em>infinitely</em>-sized in that axis.
 	(In other words, the maximum size it has when sized as “shrink-to-fit”.)
+
+	<p class="note">
+	Note that when the box has an intrinsic aspect ratio,
+	size constraints in the opposite dimension will transfer through
+	and can affect the ''width/auto'' size in the considered one.
+	See <a href="https://www.w3.org/TR/CSS2/visudet.html">CSS2&sect;10</a>.
+
 	For replaced elements,
-	if this size would depend on the size of the containing block
+	if the <a>max-content size</a> size would depend
+	on the size of the containing block
 	(as it does for images with an intrinsic aspect ratio but no intrinsic size,
 	see <a href="https://www.w3.org/TR/CSS2/visudet.html#inline-replaced-width">CSS2&sect;10.3.2</a>)
 	and therefore can't be calculated against an infinitely-sized containing block