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RE: Navigational features

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Mon, 28 Nov 2005 11:42:26 -0600
To: <w3c-wai-gl@w3.org>
Message-ID: <006f01c5f443$19226d80$ee8cfea9@NC6000BAK>

In follow up to this note - i checked and see that

1)  we forgot to edit the success criterion to match our Nov 10 call.  
SC 2.4.1 should say 

"2.4.1 Navigational mechanisms within the content can be programmatically
determined. "


Then - the "How to meet 2.4.1" section of Understanding WCAG 2.0 should be
edited to show why structural features are not included here;  only
mechanisms.  I suggest the following be added to the end of the INTENT
section. 

In addition to the navigational mechanisms, structure (e.g. headings, table
structure, etc) are also very useful in navigation.  They are not included
here because they are already required by level 1 success criterion  1.3.1.


(context for this suggestion is below) 

Gregg

 -- ------------------------------ 
Gregg C Vanderheiden Ph.D. 
Professor - Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 


-----Original Message-----
From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Gregg Vanderheiden
Sent: Sunday, November 27, 2005 9:09 PM
To: jim@jimthatcher.com; w3c-wai-gl@w3.org
Subject: RE: Navigational features


Jim

Structure is always useful in navigation.  And originally we had planned to
have it covered here but it was pointed out that it is already covered in
1.3 where any structure (obvious from presentation) is required to be
programmatically determined.  Thus it didn't need to be covered here. 

In fact, I thought that 2.4.1 was reworded from "Navigational Features"
(back to) "Navigational mechanisms" since the definition is clearly all
about (and restricted to) mechanisms.

Do you agree that what you seek should be already covered by 1.3?  or do you
see more.

Thanks 
 
Gregg

 -- ------------------------------
Gregg C Vanderheiden Ph.D. 
Professor - Ind. Engr. & BioMed Engr.
Director - Trace R & D Center
University of Wisconsin-Madison 


-----Original Message-----
From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Jim Thatcher
Sent: Sunday, November 27, 2005 8:02 PM
To: w3c-wai-gl@w3.org
Subject: Navigational features


2.4.1 Navigational features within the content can be programmatically
determined.

Navigational features are defined as mechanisms that allow the user to
locate and/or move to a different piece of content.

Referring to the same (as in my message about 1.1.1) heading image on the
left side of http://borders.com with the text "Browse" in white letters on a
greenish-blue background. Is that a navigational feature? I think it is and
it should be by SC 2.4.1 possible to programmatically know about it. Which
means it should be (in HTML) marked up as a heading. 

I think that in-page navigation is a critically important accessibility
issue today (for any non-mouse user) and it is easy to address (HTML view)
by requiring headings markup for the section headings of a page. I want that
to be clearly and certainly reflected as a (or in a) level one success
criteria of WCAG 2.0. 

I think 2.4.1 does address my concern, except not "clearly and certainly".

I advocated a skip link provision in the Section 508 Advisory Committee
meetings. It was a hack, but addressed in the only available way this
problem of incredibly difficult in-page navigation for people who can't see
the page and who don't use a mouse.

The "skip over navigation" issue has been raised (up) to a Level 2 Success
criterion: 

2.4.3 Blocks of content that are repeated on multiple perceivable units are
implemented so that they can be bypassed. 

What needs to be at level 1 is a more general requirement than bypassing
repeated content. I think that HTML headings markup on the "browse" image on
Borders.com (and others like it, of course) should be the consequence of a
level one success criterion of WCAG 2.0. 2.4.1 is close. Is it there?
Perhaps the definition of "navigational features" can be changed to "clearly
and certainly" include the "Browse" heading of borders.com.

Jim
 
Accessibility Consulting: http://jimthatcher.com/
512-306-0931
Received on Monday, 28 November 2005 17:42:37 GMT

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