[css-color-4] Add explanatory note w3c#5284

Author: svgeesus

css-color-4/Overview.bs

@@ -652,11 +652,31 @@ Named Colors</h3>
 
 	The names resolve to colors in sRGB.
 
-	16 of CSS's named colors come from HTML originally:
+	16 of CSS's named colors come from the VGA palette originally, and were then adopted into HTML:
 	aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, and yellow.
 	Most of the rest
 	come from one version of the X11 color system,
-	used in Unix-derived systems to specify colors for the console.
+	used in Unix-derived systems to specify colors for the console,
+	and were then adopted into SVG.
+
+	Note: these color names are standardized here,
+	<em>not because they are good</em>,
+	but because their use and implementation has been widespread for decades
+	and the standard needs to reflect reality.
+	Indeed, it is often hard to imagine what each name will look like (hence the list below);
+	the names are not evenly distributed throughout the sRGB color volume,
+	the names are not even internally consistent
+	(<span class="swatch" style="--color: darkgray"></span> ''darkgray'' is lighter than
+	<span class="swatch" style="--color: gray"></span> ''gray'', while
+	<span class="swatch" style="--color: lightpink"></span> ''lightpink'' is darker than
+	<span class="swatch" style="--color: pink"></span> ''pink''),
+	and some names
+	(such as <span class="swatch" style="--color: indianred"></span> ''indianred'',
+	which was originally named after a red pigment from India),
+	have been found to be offensive.
+	Thus, their use is not encouraged.
+
+
 	(Two special color values, ''transparent'' and ''<color>/currentcolor'',
 		are specially defined in their own sections.)