- From: Bert Bos <bert@w3.org>
- Date: Wed, 16 Feb 2005 19:57:50 +0100
- To: Undisclosed.Recipients: ;
- Cc: "www-style Mailing List" <www-style@w3.org>
On Tuesday 08 February 2005 17:36, Christian Roth wrote:
> In the core syntax [1] (so this holds true for both CSS21 and CSS3),
> the selector part of a ruleset is optional:
>
> ruleset : selector? '{' S* declaration? [ ';' S* declaration? ]* '}'
> S*;
>
> However, none of the different specific grammars for selectors (i.e.
> neither the one for CSS21 [2] nor for CSS3 [3]) actually allow a
> selector to be empty.
I don't remember the original arguments, but I think it was the correct
thing to do.
I don't know of any proposals to assign a meaning to a selector-less
rule, but that's no reason to exclude such a rule for all time. Maybe
we'll find some application in the future, for something else than
styling.
Meanwhile, it doesn't seem to have any negative effect. On the contrary:
a selector-less rule is parsed and ignored. That's one less opportunity
for a parsing error.
>
> [1] <http://www.w3.org/TR/CSS21/syndata.html#tokenization>
> [2] <http://www.w3.org/TR/CSS21/grammar.html>
> [3] <http://www.w3.org/TR/2003/WD-css3-syntax-20030813/#grammar0>
> [4] <http://www.w3.org/TR/CSS21/syndata.html#q10>
Bert
--
Bert Bos ( W 3 C ) http://www.w3.org/
http://www.w3.org/people/bos W3C/ERCIM
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Received on Wednesday, 16 February 2005 18:57:52 UTC