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Re: [css3-selectors] :contains

From: L. David Baron <dbaron@dbaron.org>
Date: Sun, 30 May 2004 09:06:32 -0700
To: W3C CSS List <www-style@w3.org>, public-css-testsuite@w3.org
Message-ID: <20040530160632.GA3049@darby.dbaron.org>
On Sunday 2004-05-30 14:35 +0200, Anne van Kesteren (fora) wrote:
> >  Content generated with the ::before and ::after pseudo-elements does 
> >not actually modify the content of the element; only the way it is 
> >presented, and thus does not affect whether or not another selector 
> >matches.  The background colour should be red.

> Personally, I don't see a difference here and I think that they all 
> should have a green background (which stands for PASS, obviously). 

This contradicts the entire model of CSS processing -- selectors are
matched against the content, declarations from the matching rules are
cascaded to determine the specified values, and then values are
computed.

Furthermore, I don't see a use case for your proposal.  Generated
content is unlikely to contain text like this since generated content
should not be used for things that are essential to viewing the document
(such as adding text).  It should only be used for things that are
stylistic (e.g., changing the list-numbering style).

> Especially since ':first-letter' _does_ apply to '::before'. That would 
> lead to incosinstency between selectors, something you should avoid, imo.

Pseudo-elements are very different from pseudo-classes.  Pseudo-classes
are just selectors:  they affect whether an element matches the
selector.  Pseudo-elements are styling specific parts of an element, but
the selector matching process for pseudo-elements essentially occurs
without the pseudo-element.


Also, cross-posting between www-style and public-css-testsuite is almost
never the right thing to do, especially since the membership of the
two lists is quite similar.  This discussion belongs on www-style.

-David

-- 
L. David Baron                                <URL: http://dbaron.org/ >

Received on Sunday, 30 May 2004 12:07:05 GMT

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