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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 06:35:06 -0800 (PST)
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,

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.
Received on Tuesday, 26 November 2013 14:35:37 UTC

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