[css-flexbox] Rename the terms used in automatic minimum size calculations. Part of #2385.

Author: tabatkins

css-flexbox-1/Overview.bs

@@ -910,42 +910,44 @@ Automatic Minimum Size of Flex Items</h3>
 	of the 'min-width' and 'min-height' properties
 	[[!CSS-SIZING-3]]
 	(which represents their initial value)
-	applies an <a>automatic minimum size</a>
-	to <a>flex items</a> whose 'overflow' is ''overflow/visible'' in the <a>main axis</a>.
+	applies a <dfn for="flexbox">content-based minimum size</dfn>
+	to <a>flex items</a> whose 'overflow' is ''overflow/visible'' in the <a>main axis</a>;
+	any other 'overflow' value causes the <a>automatic minimum size</a> to be zero,
+	as usual.
 
-	In general, the <a>automatic minimum size</a> of a <a>flex item</a>
-	is the smaller of its <a>content size</a> and its <a>specified size</a>.
+	In general, the <a>content-based minimum size</a> of a <a>flex item</a>
+	is the smaller of its <a>content size suggestion</a> and its <a>specified size suggestion</a>.
 	However, if the box has an aspect ratio and no <a>specified size</a>,
-	its <a>automatic minimum size</a>
-	is the smaller of its <a>content size</a> and its <a>transferred size</a>.
-	If the box has neither a <a>specified size</a> nor an aspect ratio,
-	its <a>automatic minimum size</a> is the <a>content size</a>.
+	its <a>content-based minimum size</a>
+	is the smaller of its <a>content size suggestion</a> and its <a>transferred size suggestion</a>.
+	If the box has neither a <a>specified size suggestion</a> nor an aspect ratio,
+	its <a>content-based minimum size</a> is the <a>content size suggestion</a>.
 
-	The <a>content size</a>, <a>specified size</a>, and <a>transferred size</a>
+	The <a>content size suggestion</a>, <a>specified size suggestion</a>, and <a>transferred size suggestion</a>
 	used in this calculation account for the relevant min/max/preferred size properties
-	so that the <a>automatic minimum size</a> does not interfere with any author-provided constraints,
+	so that the <a>content-based minimum size</a> does not interfere with any author-provided constraints,
 	and are defined below:
 
 	<dl>
-		<dt><dfn dfn noexport>specified size</dfn>
+		<dt><dfn dfn noexport>specified size suggestion</dfn>
 		<dd>
 			If the item’s computed <a>main size property</a> is <a>definite</a>,
-			then the <a>specified size</a> is that size
+			then the <a>specified size suggestion</a> is that size
 			(clamped by its <a>max main size property</a> if it's <a>definite</a>).
 			It is otherwise undefined.
 
-		<dt><dfn dfn noexport>transferred size</dfn>
+		<dt><dfn dfn noexport>transferred size suggestion</dfn>
 		<dd>
 			If the item has an intrinsic aspect ratio
 			and its computed <a>cross size property</a> is <a>definite</a>,
-			then the <a>transferred size</a> is that size
+			then the <a>transferred size suggestion</a> is that size
 			(clamped by its <a lt="min cross size property">min and max cross size properties</a> if they are <a>definite</a>),
 			converted through the aspect ratio.
 			It is otherwise undefined.
 
-		<dt><dfn dfn noexport>content size</dfn>
+		<dt><dfn dfn noexport>content size suggestion</dfn>
 		<dd>
-			The <a>content size</a> is the <a>min-content size</a> in the <a>main axis</a>,
+			The <a>content size suggestion</a> is the <a>min-content size</a> in the <a>main axis</a>,
 			clamped, if it has an aspect ratio, by any <a>definite</a> <a lt="min cross size property">min and max cross size properties</a> converted through the aspect ratio,
 			and then further clamped by the <a>max main size property</a> if that is <a>definite</a>.
 	</dl>