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Re: [css3-selectors] Grouping

From: Andrew Fedoniouk <news@terrainformatica.com>
Date: Sat, 09 Jan 2010 20:11:24 -0800
Message-ID: <4B49536C.9010305@terrainformatica.com>
To: Boris Zbarsky <bzbarsky@MIT.EDU>
CC: "Tab Atkins Jr." <jackalmage@gmail.com>, Nikita Popov <privat@ni-po.com>, www-style list <www-style@w3.org>
Boris Zbarsky wrote:
> On 1/9/10 9:17 PM, Andrew Fedoniouk wrote:
>> Beside of the fact that @set feature significantly reduces CPU payload
>> it is very useful for things like UI components frameworks
> Scoped stylesheets are indeed useful.  Last I checked, there was work on 
> them; certainly Mozilla's current XBL has such a concept, and I think 
> HTML5 had some proposals along those lines as well.
> It sounds like your style sets are essentially scoped stylesheets with a 
> CSS selector syntax for establishing the scope, right?

Correct, style set establishes its own scope.

Even :root element inside the set matches the element with defined 
style-set attribute - not the document root. Rules inside the set
know nothing about the document root - agnostic to their root element 
position in the host DOM. That is disputable of course, but it is how I 
see all this.

One obvious exception though - scope is defined by the CSS itself and 
not by something external like XBL or HTML5. There are problems with 
external approach. For example multiple sets declared in single
style unit (file) may use common @const declarations, etc.

With style sets some framework (e.g. YUI or jQUI ) may define whole
UI theme as a single CSS file instead of splitting all pieces into 
multiple files that need to be managed and downloaded separately, etc.
As style sets do not create payload when not used then this is
perfectly fine for such use cases.

> -Boris

Andrew Fedoniouk.

Received on Sunday, 10 January 2010 04:10:56 UTC

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