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What is "S" in CSS grammar?

From: Peng Yu <pengyu.ut@gmail.com>
Date: Tue, 27 Dec 2011 16:24:48 -0600
Message-ID: <CABrM6wn2S32bJs7dXu7QRj9tDTE-Ku=_1KLLTVzAc6BJZz8YQg@mail.gmail.com>
To: www-style@w3.org
Hi,

http://www.w3.org/TR/CSS2

The above document mentioned something link this.

hexcolor
: HASH S*
;

I also see the following. I'm wondering if the following S is the above S.

S s|\\0{0,4}(53|73)(\r\n|[ \t\r\n\f])?|\\s

I know some of above syntax, but not all. Could anybody help me
understand what the above sentence mean?

I'm not familiar enough with flex syntax. Sorry for asking a naive question.

-- 
Regards,
Peng
Received on Tuesday, 27 December 2011 23:07:24 GMT

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