[css-values-4] Clarify that clamping happens to 'top-level calculations'. #8158

Author: tabatkins

css-values-4/Overview.bs

@@ -4641,7 +4641,7 @@ Range Checking</h3>
 
 	Parse-time range-checking of values is not performed within [=math functions=],
 	and therefore out-of-range values do not cause the declaration to become invalid.
-	However, the value resulting from an expression
+	However, the value resulting from a [=top-level calculation=]
 	must be clamped to the range allowed in the target context.
 	Clamping is performed on <a>computed values</a> to the extent possible,
 	and also on <a>used values</a>
@@ -5189,6 +5189,9 @@ Recent Changes</h3>
 			(<a href="https://github.com/w3c/csswg-drafts/issues/8532">Issue 8532</a>)
 		<li>Clarified that fully omitted ''mix()'' arguments are valid.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/8556">Issue 8556</a>)
+		<li>Clarified that range clamping happens specifically to [=top-level calculations=]
+			(rather than the unclear term "expressions").
+			(<a href="https://github.com/w3c/csswg-drafts/issues/8158">Issue 8158</a>)
 	</ul>
 
 	Substantial changes since <a href="https://www.w3.org/TR/2021/WD-css-values-4-20211016/">16 October 2021 WD</a>: