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Re: [css3-background] PFWG review of css3-background 2009-10-15 LCWD

From: fantasai <fantasai.lists@inkedblade.net>
Date: Wed, 24 Feb 2010 14:44:26 -0800
Message-ID: <4B85ABCA.6090703@inkedblade.net>
To: Michael Cooper <cooper@w3.org>
CC: "Tab Atkins Jr." <jackalmage@gmail.com>, www-style <www-style@w3.org>, List WAI Liaison <wai-liaison@w3.org>
On 02/24/2010 02:26 PM, Michael Cooper wrote:
> This is a PFWG acknowledgement of your response to our comment on CSS 3
> Backgrounds and Borders. PFWG approval to send this acknowledgement is
> recorded at http://www.w3.org/2010/02/10-pf-minutes.html#item12.
>
> We're still somewhat concerned the CSS allows only for a
> background-image, and not for other types of images.  We are also not
> convinced that allowing for a high-contrast-foreground-image and
> high-contrast-background-image would constitute a hack.  It is possible
> that the image module or media queries is the right place for this
> functionality.  We are, however, aware that our feedback came quite
> late, and that it may not be possible to incorporate for this version of
> CSS.  Should that be the case, please consider this use case as a
> feature request for the next version.

CSS allows for three types of images:
   - Marker images, such as for list bullets, using 'list-style-image'
   - Background images, using 'background-image'
   - Content images, using the 'content' property (which is currently
     limited to the :before and :after pseudo-elements, but which in
     CSS3 will able to insert and replace content in all elements).

What is the use case that you have in mind that is not addressed by
any of these three features?

> You state that "There is also an effort in the CSS Images module to
> address spriting directly and make it generally useful in CSS, rather
> than only being useful in backgrounds."  We were unable to locate that
> module.  Can you point us to the document, so that we may provide input
> to that group?  Is it in Last Call as well?

The CSS3 Images module is currently a Working Draft:
   http://www.w3.org/TR/css3-images/

The Media Fragments spec is also a Working Draft:
   http://www.w3.org/TR/media-frags/

> While we appreciate the effort to take CSS3 to last call we are working
> to define new CSS attributes to allow people with disabilities to render
> alternative content to HTML 5 elements, like canvas, to make it
> accessible. Since CSS3 features have a tight association with HTML 5
> features we request that the new features for content selection, and

This is, afaict, only true for media queries, and not true in general.

> which are based on IMS Global Learning Consortium, access for all
> features be agreed upon in the HTML working group and included in the
> CSS 3 media query specification before it can complete CR.

I'm sorry, but the current Media Queries Candidate Recommendation is
not accepting new features. The CSS Working Group is open to creating
a new module that addresses alternative content use cases, but those
features would belong in a separate REC-track document.

> We appreciate this is disruptive. The canvas accessibility working group
> is working to have a recommendation on canvas accessibility by Feb 25.
> Should we agree to use media queries as the vehicle to address selection
> of alternative content we will submit our requests by this date to
> discuss requirements.

We will look forward to your suggestions as the starting point for a
new Media Queries module.

~fantasai
Received on Wednesday, 24 February 2010 22:45:03 GMT

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