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Re: UNS: RE: UNS: WCAG considering amending F65 to NOT fail missing ALT text if title or aria-label is present

From: Sailesh Panchang <spanchang02@yahoo.com>
Date: Tue, 26 Nov 2013 14:35:34 +0000
Message-ID: <1385476506.89010.YahooMailBasic@web125004.mail.ne1.yahoo.com>
To: David MacDonald <david100@sympatico.ca>, Joshue O Connor <joshue.oconnor@cfit.ie>
Cc: 'HTML Accessibility Task Force' <public-html-a11y@w3.org>, 'WCAG WG' <w3c-wai-gl@w3.org>
David / Joshue,
This solution about aria-describedby  has been in the survey comments for two weeks now and I had drawn attention to it during the call too: 
"iii. On  reflection, I think it is always better to use aria-describedby on the alt (instead of aria-labelledby). The intent is to have available text on 
the page announced without need for duplicating and also to avoid pitfalls of not assigning an alt or using alt="". So the alt can be say, a single word and the more descriptive text elsewhere on the page. Then both will be read. For instance the alt can be "Logo:" and the aria-describedby can be the org's name say at the top of the page. In the star rating example (on aria-labelledby example for image), the alt can be "Rating:" and the other text can be "3 /5" etc. So if we adopt this approach, we should not advocate use of aria-labelledby for images." 

Using aria-describedby in this way helps to enhance accessibility / user experience. It does not distort  the way different user groups identify the image if aria-labelledby were used .... a point I made earlier too and is illustrated in David's code sample:
<img scr="eiffelTower.jpg" alt="Eiffel tower" labelledby="123">
<p id="123"> The tower stands 324 metres (1,063 ft.) tall</p>

Is this not a concern? Or is the focus only on ARIA supported AT users?
Again the focus of ARIA is on rich Internet apps / content. The algorithm's focus is clearly on  interactive elements as per the examples.
Thanks and regards,
Sailesh




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On Tue, 11/26/13, Joshue O Connor <joshue.oconnor@cfit.ie> wrote:

 Subject: Re: UNS: RE: UNS: WCAG considering amending F65 to NOT fail missing   ALT text if title or aria-label is present
 To: "David MacDonald" <david100@sympatico.ca>
 Cc: "'HTML Accessibility Task Force'" <public-html-a11y@w3.org>, "'WCAG WG'" <w3c-wai-gl@w3.org>
 Date: Tuesday, November 26, 2013, 6:30 AM
 
 David MacDonald wrote:
 > There are several fixes, here are two:
 > 1) use aria-describedby insread of aria-labelledby
 because it maps to the
 > accDescription, not the accName, so the alt gets the
 accName and the
 > describedby gets accDescription
 > 2) leave off the aria-labelledby, so the user will hear
 the ALT text, and
 > encounter the supplementary text in the paragraph after
 the image.
 
 Thanks, and if you find a suitable spot in one of our wikis
 that'd be great (if not already there somewhere). Also maybe
 also overviews of what accName/accDescription are - most
 designers don't think on this level at all.
 
 > If the algorithm does not shift from OR to AND, then we
 will need to
 > introduce WCAG failures for the presence of both
 ALT+aria-label, and
 > ALT+aria-labelledby in an image.
 
 <chair hat off> Maybe, maybe not. We really have to
 discuss these things on a case by case basis. Accessible
 development techniques and UA support are always changing,
 so some caution is needed - (this is part of the reason we
 are having this unforeseen @alt debate, no?). Ideally, the
 standard should define the behaviour but as we know in
 practice that's just not always the case.
 
 Thanks
 
 Josh
 
 
Received on Tuesday, 26 November 2013 17:53:01 UTC

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