[css-color-4] Improved serialization of named, system, dep system & transparent w3c#7870

Author: svgeesus

css-color-4/Overview.bs

@@ -5533,18 +5533,28 @@ Serializing sRGB values</h3>
 	* [=named colors=]
 	* [=system colors=]
 	* <a href="#deprecated-system-colors">deprecated-colors</a>
+	* ''transparent''
 
-	<!-- are all system colors assumed to be sRGB? -->
+	<!-- are all system colors assumed to be sRGB?
+		https://github.com/w3c/csswg-drafts/issues/8312
+	-->
 
 	is derived from the [=specified value=].
 
 	When serializing the value of a property 
-	which was set by the author to a CSS named color, 
+	which was set by the author to a CSS [=named color=], 
+	a [=system color=],
+	a <a href="#deprecated-system-colors">deprecated-color</a>,
+	or ''transparent''
 	therefore, for the [=specified value=],
-	the (all lowercase) named value is retained.
+	the <a href="https://infra.spec.whatwg.org/#ascii-lowercase">ASCII lowercase</a>  
+	keyword value is retained.
 	For the computed and used value,
 	the corresponding sRGB value is used.
 
+	Thus, the serialized specified value of ''transparent'' is the string "transparent",
+	while the serialized computed value of ''transparent'' is the string "rgba(0, 0, 0, 0)".
+
 	For all other sRGB values,
 	the specified, computed and used value
 	is the corresponding sRGB value.
@@ -5924,16 +5934,13 @@ Serializing values of the ''color()'' function</h3>
 Serializing other colors</h3>
 
 	This applies to
-	''transparent'' and
 	''currentcolor''.
 
-	The serialized form of these values
+	The serialized form of this value
 	is derived from the [=computed value=]
 	and uses <a href="https://infra.spec.whatwg.org/#ascii-lowercase">ASCII lowercase</a> 
 	letters for the color name.
 
-	The serialized form of ''transparent'' is the string "rgba(0, 0, 0, 0)".
-
 	The serialized form of ''currentColor'' is the string "currentcolor".
 
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