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Re: [CSS3] pseudo class for "current element"

From: L. David Baron <dbaron@dbaron.org>
Date: Tue, 25 Jan 2005 16:18:55 -0800
To: www-style@w3.org
Message-ID: <20050126001855.GA13122@ridley.dbaron.org>
On Tuesday 2005-01-25 15:59 -0800, Andrew Fedoniouk wrote:
> For example: 
> <select> element (list box) is "focusable" element but its <options> are not. 
> Being in focus, <select> has one current item (option) which is visually distinct from others. 

The selected option should probably match the :checked pseudo-class.  A
SELECT is logically pretty much the same thing as a radio group.  

> I mean it is lack of "containment" selectors like:
> 
> P < DIV  - any <div> which contains <p> 
> * < DIV  - non empty div 
> OPTION:focus < SELECT  - select having option in focus. 

These have been discussed extensively on this list and one proposal was
in early drafts of css3-selectors.   Search for ":subject" (the one that
was in css3-selectors), ":has", and ":matches".

The problem is that they're all difficult to implement effeciently in
the processing model used for CSS selectors (used via a function that
maps (element, selector) -> boolean).

(The two bits of your message that I quoted seem like two entirely
separate issues, although the middle of the message seemed to connect
them in a way that I didn't understand.)

-David

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

Received on Wednesday, 26 January 2005 00:19:28 GMT

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