[css-color-5] Clarify resolved values of color-contrast() with currentColor; add resolved section for color-mix(). See #6168

Author: svgeesus

css-color-5/Overview.bs

@@ -2380,8 +2380,13 @@ or any other color or monochrome output device which has been characterized.
 		with each <<color>> parameter resolved according to [[css-color-4#resolving-color-values]],
 		and the keywords ''AA'', ''AA-large'', ''AAA'', ''AAA-large'' replaced with their corresponding numeric value.
 
-		The used value is the winning color
+		If all <<color>> parameters resolve
+		to the corresponding colors in their respective color spaces,
+		the used value is the winning color
 		resolved according to [[css-color-4#resolving-color-values]].
+		Otherwise (if ''currentColor'' was used in the function),
+		the used value is the same as the computed value
+		thus preserving inheritance into child elements.
 
 		<div class="example">
 
@@ -2393,19 +2398,27 @@ or any other color or monochrome output device which has been characterized.
 				color-contrast(currentColor vs hsl(200 83% 23%), purple to AA)
 			</pre>
 
-			has the computed value
+			has the computed and used value
 
 			<pre class="lang-css">
 				color-contrast(currentColor vs rgb(10 75 107), rgb(128 0 128) to 4.5)
 			</pre>
 
-			and the used value
+		</div>
 
-			<pre class="lang-css">
-				rgb(128 0 128)
-			</pre>
+		<h3 id="resolving-mix">Resolving ''color-mix()'' values</h3>
 
-		</div>
+		The computed value is the specified ''color-mix()'' function
+		with each <<color>> parameter resolved according to [[css-color-4#resolving-color-values]].
+
+		If all <<color>> parameters resolve
+		to the corresponding colors in their respective color spaces,
+		the used value is the mixed color,
+		in the specified mixing color space,
+		resolved according to [[css-color-4#resolving-color-values]].
+		Otherwise (if ''currentColor'' was used in the function),
+		the used value is the same as the computed value
+		thus preserving inheritance into child elements.