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RE: SC 2.1.1 and server-side image maps

From: Christophe Strobbe <christophe.strobbe@esat.kuleuven.be>
Date: Fri, 09 Feb 2007 16:51:40 +0100
Message-Id: <>
To: <w3c-wai-gl@w3.org>

Hello Gregg,

At 02:04 9/02/2007, Gregg Vanderheiden wrote:

>Content always applies to the Web Page, not to individual parts of it.

OK, but we must be aware for the implications of this for SC 4.2.2 
(bullet 1): "If content can be entered using the keyboard, then the 
content can be exited using the keyboard," or in the editors' draft: 
"If focus can be moved to content using a keyboard interface, then 
focus can be moved away from that content using only a keyboard 
interface, and the method for doing so is described before the 
content is encountered and in a way that meets all Level 1 success criteria."
I thought this should apply not only to the "web page" considered as 
a whole (i.e. you can enter the page and exit before interacting with 
any of the components in it), but also to each of the individual 
parts (text, image, Flash/Java object, ... so if you can enter an 
embedded Java applet using the keyboard, you can also exit it). Even 
if "content" does not apply to individual parts of web pages, this is 
an SC that can be met only if each of the individual parts (that can 
be entered using the keyboard) also meet it, but a server-side image 
map can't meet SC 2.1.1 by itself: it is the page that meets the SC 
by providing redundant text links for this specific "individual part".

>The SC apply to Web pages.
>CS image maps are not mentioned because we don't have specific requirements
>for them.  We could include some examples to show some ways of handling our
>requirements but we don't have a way that you must use.

My mistake: I meant server-side image maps instead of client-side ones.

Best regards,


>Does this clear your question?
>  -- ------------------------------
>Gregg C Vanderheiden Ph.D.
> > -----Original Message-----
> > From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On
> > Behalf Of Christophe Strobbe
> > Sent: Thursday, February 08, 2007 3:01 PM
> > To: w3c-wai-gl@w3.org
> > Subject: SC 2.1.1 and server-side image maps
> >
> >
> > Hi,
> >
> > During the review of certain WCAG 2.0 test cases in the BenToWeb
> > project, we ran into the following issue.
> > Success criterion 2.1.1 requires: "All functionality of the content
> > is operable in a non-time-dependent manner through a keyboard
> > interface, except where the task requires analog, time-dependent input."
> > Appendix D of WCAG 2.0 (Comparison of WCAG 1.0 checkpoints to WCAG
> > 2.0 - non-normative) maps WCAG 1.0 checkpoint 1.2 to several WCAG 2.0
> > success criteria. Checkpoint 1.2 reads: "Provide redundant text links
> > for each active region of a server-side image map." With regard to
> > keyboard access, the checkpoint is mapped to success criterion 2.1.1,
> > but it is not clear whether providing redundant text links is
> > sufficient: if "content" (as in "All functionality of the
> > content...") is interpreted as confined to the image map itself,
> > server-side image maps always fail SC 2.1.1 and an alternative needs
> > to be provided to meet SC 4.2.1, but if "content" is interpreted as
> > the web page containing the image map, then redundant text links in
> > the same web page would meet SC 2.2.1 and it would not be necessary
> > to fall back on SC 4.2.1. However, client-side image maps are not
> > mentioned in Understanding WCAG 2.0, nor in Techniques for WCAG 2.0.
> > The June 2005 version of HTML Techniques for WCAG 2.0 contained a
> > technique called "Text links for server-side image maps"[1] (for
> > success criterion 2.4 L 1 SC 1), but it is not entirely clear if this
> > would now be considered as a technique for SC 2.1.1 or for SC 4.2.1.
> >
> > [1]
> > http://www.w3.org/TR/2005/WD-WCAG20-HTML-TECHS-
> > 20050630/Overview.html#ssim_textlinks

Christophe Strobbe
K.U.Leuven - Departement of Electrical Engineering - Research Group 
on Document Architectures
Kasteelpark Arenberg 10 - 3001 Leuven-Heverlee - BELGIUM
tel: +32 16 32 85 51

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
Received on Friday, 9 February 2007 15:51:56 UTC

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