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Re: Comments in CSS

From: Bert Bos <bert@w3.org>
Date: Wed, 7 Dec 2005 20:51:13 +0100
To: www-style@w3.org
Message-Id: <200512072051.13586.bert@w3.org>

On Wednesday 07 December 2005 17:26, Anne van Kesteren wrote:
> On Wed, 07 Dec 2005 17:11:37 +0100, Manuel Strehl
>
> <manuel.strehl@stud.uni-regensburg.de> wrote:
> > So, if you'd like to test the CSS without, say, prop2 (cause you'd
> > like to see what it's like, when the UA overrides your "color"
> > property...), it would be really fine, if you could comment it out
> > by just typing "//" rather than wrap it in "/*"..."*/":
> >
> > selector {
> >   property1;
> >   //property2;        much faster than /*property2*/
> >   property3;
> > }
>
> How about x-property2;? That would cause the rule to be dropped. Not
> the same semantics, but you keep the effect. (I mostly just use x
> without all the dashes, but this seems more appropriate.)

I do the same as Anne.

It is not possible to introduce "//" as a comment delimiter without 
changing the core grammar of CSS. CSS says that "//" consists of two 
tokens "/". Although we currently only have expressions with a single 
"/", it is possible to add some later that use "//".

Back when the syntax of CSS was developed, it wasn't felt necessary to 
use "//" for comments, nor "#" for that matter. The latter was more 
useful for ID selectors and we thought the former would someday be used 
as a combinator (I forget whether it became '+', '>' or '~'). And 
anyway, we believed it was enough to have "/*...*/" comments plus the 
fact that incorrect properties/rules are ignored.



Bert
-- 
  Bert Bos                                ( W 3 C ) http://www.w3.org/
  http://www.w3.org/people/bos                               W3C/ERCIM
  bert@w3.org                             2004 Rt des Lucioles / BP 93
  +33 (0)4 92 38 76 92            06902 Sophia Antipolis Cedex, France
Received on Wednesday, 7 December 2005 19:51:27 GMT

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