spec/css4-color: [extensions to css3-color features] move 4/8 digit hex colors to impl extensions, since I have a pending patch for webkit for it

Author: tabatkins

spec/css4-color.txt

@@ -13,19 +13,18 @@ Implementations may have found it useful to extend existing CSS3-Color features,
 
 As these are most likely to be practical and minimal (and supported by a second implementation), these are the first features we'll consider.
 
-  * ...
+  * 4 and 8-digit hex colors, so you can specify alpha with the hex representation.  It's non-trivial to translate hexadecimal to decimal for reformatting the color as rgba().
 
 ==== real world author extension needs ====
 Second, users and authors may have found that they wanted a CSS3-Color feature to work a certain way in their sites, and these real world needs are a second consideration.
 
   * the opacity argument from rgba() and hsla() should accept a percentage as well, with the obvious meaning.  It's confusing to be restricted to a number in [0,1], since that's effectively a percentage, especially since rgba() allows rgb to be specified in percentages, and hsl() *requires* them for s and l.
   * The rgb components of rgb/a() should accept <number> rather than <integer>, rounding to the nearest value the impl supports.  It's pretty common to get confusing errors when working with colors in <canvas> because you forgot to round the components to the nearest integer, thus producing an invalid color.
-  * 4 and 8-digit hex colors, so you can specify alpha with the hex representation.  It's non-trivial to translate hexadecimal to decimal for reformatting the color as rgba().
+
 ==== theoretical extension requests ====
 Third, there are hypothetical requests for extensions to CSS3-Color features. As these are not real world proven (only theoretical) demands, they are purely tertiary. We may consider them optimistically and include them in working drafts to solicit feedback and additional interest.
 
   * ...
-
 ===== new css4-color features =====
 Brand new features for CSS4-Color. We'll follow the same prioritization as above.