RE: Question: testing for non-unique id values SC 4.1.1

+1


Warm regards,

Charu Pandhi
---------------------------------------
Accesibility Tooling and Automation lead
IBM Accessibility Research
 (512) 286 6370, T/L 363 6370
http://w3.ibm.com/able   http://www.ibm.com/able
 
      Vice President, SWE Southwest Texas
      swt.swe.org





From:   "White, Jason J" <jjwhite@ets.org>
To:     Jonathan Avila <jon.avila@ssbbartgroup.com>, "w3c-wai-gl@w3.org" 
<w3c-wai-gl@w3.org>
Date:   09/29/2016 03:03 PM
Subject:        RE: Question: testing for non-unique id values SC 4.1.1





> -----Original Message-----
> From: Jonathan Avila [mailto:jon.avila@ssbbartgroup.com]
> I think this is also a broader question -- if there is a failure for 
content that is
> hidden and never shown in any responsive mode such as a input without
> accessible name used as a honey pot with display:none -- is that really 
a failure
> of any of the criteria?
[Jason] It may be a failure. In particular, I am concerned that assistive 
technologies implemented in scripts (e.g., as browser extensions) may 
encounter difficulties. For example, if they use querySelector() or 
getElementById() to match an element with a specified ID, the search of 
the document tree won't be restricted to "visible" nodes.
The kind of script demonstrated by Lisa Seeman on behalf of the COGA Task 
Force at TPAC last week provides a very good example of what I have in 
mind. It can be implemented as a browser extension that offers cognitive 
support (an assistive technology) to the user.
I would only consider loosening the requirements of WCAG if we could be 
sure that duplicate IDs or other departures from the success criteria in 
"hidden" content wouldn't result in problems for assistive technologies, 
including those which are browser-based rather than platform-based.


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