There are several reasons for keeping functions out of normal CSS. The 
first is that it becomes much, much easier to parse; we don't have to 
think about the content of the attributes at all. This is a good thing. 
A slightly less Nathan-is-lazy reason is that CSS3 defines a lot more 
function-like things, including stuff like hsl, and I don't want to 
interfere with that at all.

- Nathan

s.ross wrote:
> I think you're right about the undefined functions evaluating to CSS. 
> That seems like a cool way to treat it. Also, would it be desirable to 
> use the quoted form to explicitly coerce something into CSS?
>
> Is there a particular reason not to allow functions as an attribute? I 
> certainly prefer specifying colors as constants in a block at the top 
> of my Sass, but a CSS person might expect that functions would be 
> available in that context.
>
> Steve

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