[css-color-4] Export HTML-Compatible Serialization, w3c#10550

Author: svgeesus

css-color-4/Overview.bs

@@ -6205,7 +6205,7 @@ Serializing sRGB values</h3>
 		<li>The alpha is 1</li>
 		<li>There are no [=missing=] values</li>
 		<li>The RGB component values are internally represented as integers between 0 and 255 inclusive (i.e. 8-bit unsigned integer)</li>
-		<li>HTMLCompatible serialization is requested</li>
+		<li><dfn export for="color serialization">HTML-compatible serialization is requested</dfn></li>
 	</ol>
 
 	Then corresponding sRGB values are serialized in 6-digit [=hex color notation=] as follows: