The more convincing answer for my question 
(http://archivist.incutio.com/viewlist/css-discuss/86680)
I've got on a WAI list.

David White said:
"...The point about using numbers (I.e. Hex values) instead of names is 
purely so that there can be no misunderstanding when parsing on the client 
browser. Some browsers render "grey" (for example) differently but if you 
use Hex there can be no ambiguity. ..."

and I say:
It makes sense cause sometimes a slightly color difference crashes the 
threshold for contrast.

MaurĂ­cio Samy Silva
http://www.maujor.com/

----- Original Message ----- 
From: "Chris Ovenden" <[EMAIL PROTECTED]>
To: "Jukka K. Korpela" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Friday, March 30, 2007 9:43 AM
Subject: Re: [css-d] CSS color names values versus accessibility


> Interesting issue, and one I haven't given much thought to before. For
> what it's worth I only use the colour keywords 'black' and 'white' (no
> argument about what these mean!)
>
> But what about the three-digit hex contractions - ie #363 instead of
> #336633? I love other CSS shortcuts, but for some reason this one
> really irks me
>
> -- 
> Chris Ovenden
>
> http://thepeer.blogspot.com
> "Imagine all the people / Sharing all the world"
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