[css-grid-1] Clarify intention of minimum contribution. #4016

Author: fantasai

css-grid-1/Overview.bs

@@ -4002,15 +4002,19 @@ Resolve Intrinsic Track Sizes</h3>
 					set the track's <a>base size</a>
 					to the maximum of its items’ <a>minimum contributions</a>,
 					floored at zero.
-					The <dfn noexport id="min-size-contribution">minimum contribution</dfn> of an item,
-					which is considered a type of <a>intrinsic size contribution</a>,
-					is the outer size that would result from assuming
+					The <dfn noexport id="min-size-contribution">minimum contribution</dfn> of an item
+					is the smallest outer size it can have.
+					Specifically, it is the outer size
+					that would result from assuming
 					the item’s used <a>minimum size</a>
 					('min-width' or 'min-height', whichever matches the relevant axis)
 					as its <a>preferred size</a>
 					('width' or 'height', whichever matches the relevant axis)
 					if its computed <a>preferred size</a> [=behaves as auto=],
 					or else the item’s <a>min-content contribution</a> otherwise.
+					Because the <a>minimum size</a> often depends
+					on the size of the item’s content,
+					it is considered a type of <a>intrinsic size contribution</a>.
 
 					Note: For items with a specified minimum size of ''min-width/auto'' (the initial value),
 					the <a>minimum contribution</a> is usually equivalent to