[css-color-4] resist fingerrinting with mandated mappings for deprecated system colors w3c#3873

Author: svgeesus

css-color-4/Overview.bs

@@ -3582,9 +3582,9 @@ Appendix A: Deprecated CSS System Colors</h2>
 	and increase fingerprinting surface, compromising user privacy.
 
 	User agents must support these keywords,
-	but are encouraged to map them to default values
-	not based on the user's OS settings
-	or match them to appropriate (undeprecated) [=system colors=].
+	and to mitigate fingerprinting
+	must map them to the (undeprecated) [=system colors=]
+	as listed below.
 	<strong>Authors must not use these keywords.</strong>
 
 	The deprecated system colors are represented
@@ -3593,84 +3593,84 @@ Appendix A: Deprecated CSS System Colors</h2>
 
 	<dl noexport>
 		<dt><dfn>ActiveBorder</dfn>
-		<dd>Active window border.
+		<dd>Active window border. Same as ''ButtonBorder''.
 
 		<dt><dfn>ActiveCaption</dfn>
-		<dd>Active window caption.
+		<dd>Active window caption. Same as ''CanvasText''.
 
 		<dt><dfn>AppWorkspace</dfn>
-		<dd>Background color of multiple document interface.
+		<dd>Background color of multiple document interface. Same as ''Canvas''.
 
 		<dt><dfn>Background</dfn>
-		<dd>Desktop background.
+		<dd>Desktop background. Same as ''Canvas''.
 
 		<dt><dfn>ButtonHighlight</dfn>
 		<dd>The color of the border facing the light source for 3-D elements
-		that appear 3-D due to one layer of surrounding border.
+		that appear 3-D due to one layer of surrounding border. Same as ''ButtonFace''.
 
 		<dt><dfn>ButtonShadow</dfn>
 		<dd>The color of the border away from the light source for 3-D elements
-		that appear 3-D due to one layer of surrounding border.
+		that appear 3-D due to one layer of surrounding border. Same as ''ButtonFace''.
 
 		<dt><dfn>CaptionText</dfn>
-		<dd>Text in caption, size box, and scrollbar arrow box.
+		<dd>Text in caption, size box, and scrollbar arrow box. Same as ''CanvasText''.
 
 		<dt><dfn>InactiveBorder</dfn>
-		<dd>Inactive window border.
+		<dd>Inactive window border. Same as ''ButtonBorder''.
 
 		<dt><dfn>InactiveCaption</dfn>
-		<dd>Inactive window caption.
+		<dd>Inactive window caption. Same as ''Canvas''.
 
 		<dt><dfn>InactiveCaptionText</dfn>
-		<dd>Color of text in an inactive caption.
+		<dd>Color of text in an inactive caption. Same as ''GrayText''.
 
 		<dt><dfn>InfoBackground</dfn>
-		<dd>Background color for tooltip controls.
+		<dd>Background color for tooltip controls. Same as ''Canvas''.
 
 		<dt><dfn>InfoText</dfn>
-		<dd>Text color for tooltip controls.
+		<dd>Text color for tooltip controls. Same as ''CanvasText''.
 
 		<dt><dfn>Menu</dfn>
-		<dd>Menu background.
+		<dd>Menu background. Same as ''Canvas''.
 
 		<dt><dfn>MenuText</dfn>
-		<dd>Text in menus.
+		<dd>Text in menus. Same as ''CanvasText''.
 
 		<dt><dfn>Scrollbar</dfn>
-		<dd>Scroll bar gray area.
+		<dd>Scroll bar gray area. Same as ''Canvas''.
 
 		<dt><dfn>ThreeDDarkShadow</dfn>
 		<dd>The color of the darker (generally outer) of the two borders away
 		from the light source for 3-D elements that appear 3-D due to two
-		concentric layers of surrounding border.
+		concentric layers of surrounding border. Same as ''ButtonBorder''.
 
 		<dt><dfn>ThreeDFace</dfn>
 		<dd>The face background color for 3-D elements that appear 3-D due to
-		two concentric layers of surrounding border.
+		two concentric layers of surrounding border. Same as ''ButtonFace''.
 
 		<dt><dfn>ThreeDHighlight</dfn>
 		<dd>The color of the lighter (generally outer) of the two borders facing
 		the light source for 3-D elements that appear 3-D due to two
-		concentric layers of surrounding border.
+		concentric layers of surrounding border. Same as ''ButtonBorder''.
 
 		<dt><dfn>ThreeDLightShadow</dfn>
 		<dd>The color of the darker (generally inner) of the two borders facing
 		the light source for 3-D elements that appear 3-D due to two
-		concentric layers of surrounding border.
+		concentric layers of surrounding border. Same as ''ButtonBorder''.
 
 		<dt><dfn>ThreeDShadow</dfn>
 		<dd>The color of the lighter (generally inner) of the two borders away
 		from the light source for 3-D elements that appear 3-D due to two
-		concentric layers of surrounding border.
+		concentric layers of surrounding border. Same as 'ButtonBorder'''.
 
 		<dt><dfn>Window</dfn>
-		<dd>Window background.
+		<dd>Window background. Same as ''Canvas''.
 
 		<dt><dfn>WindowFrame</dfn>
-		<dd>Window frame.
+		<dd>Window frame. Same as ''ButtonBorder''.
 
 		<dt><dfn>WindowText</dfn>
-		<dd>Text in windows.
+		<dd>Text in windows. Same as ''CanvasText''.
 	</dl>