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Re: Clarification of WCAG intent and meaning of techniques [Re: WCAG considering amending F65 to NOT fail missing ALT text if title or aria-label is present]

From: Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>
Date: Thu, 28 Nov 2013 13:59:30 +0100
To: Steve Faulkner <faulkner.steve@gmail.com>
Cc: "Schnabel, Stefan" <stefan.schnabel@sap.com>, Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>, Michael Cooper <cooper@w3.org>, David MacDonald <david100@sympatico.ca>, Janina Sajka <janina@rednote.net>, HTML Accessibility Task Force <public-html-a11y@w3.org>, WCAG WG <w3c-wai-gl@w3.org>, "public-comments-wcag20@w3.org" <public-comments-wcag20@w3.org>, Gregg Vanderheiden <gv@trace.wisc.edu>, "kirsten@can-adapt.com" <kirsten@can-adapt.com>
Message-ID: <20131128135930526838.0e3b4632@xn--mlform-iua.no>
Steve Faulkner, Thu, 28 Nov 2013 12:51:05 +0000:
> Hi stefan, issue with this is
> 
> SR output: graphic Giraffe grazing on tree branches ... Giraffe grazing on
> tree branches

Stefan has a point. But perhaps your comment in reality shows that 
Stefan’s example needs an *empty* alt?

<img src="../images/giraffe.jpg" aria-labelledby="123" alt="" />
<p id="123">Giraffe grazing on tree branches</p>

Leif H


> SteveF
> HTML 5.1 <http://www.w3.org/html/wg/drafts/html/master/>
> 
> 
> On 28 November 2013 12:48, Schnabel, Stefan <stefan.schnabel@sap.com> wrote:
> 
>>>> So, to replace @alt with an @aria-* attribute, would be to do the
>> opposite of what the WCAG Robustness principle requires
>> 
>> No.
>> 
>> <img src="../images/giraffe.jpg" aria-labelledby="123"/>
>> <p id="123">Giraffe grazing on tree branches</p>
>> 
>> is equivalent since even if the image is missing the text describing the
>> image is still there.
>> 
>> - Stefan
>> 
>> 
>> -----Original Message-----
>> From: Leif Halvard Silli [mailto:xn--mlform-iua@målform.no]
>> Sent: Donnerstag, 28. November 2013 13:31
>> To: Steve Faulkner
>> Cc: Schnabel, Stefan; Michael Cooper; David MacDonald; Janina Sajka; HTML
>> Accessibility Task Force; WCAG WG; public-comments-wcag20@w3.org; Gregg
>> Vanderheiden; kirsten@can-adapt.com
>> Subject: Re: Clarification of WCAG intent and meaning of techniques [Re:
>> WCAG considering amending F65 to NOT fail missing ALT text if title or
>> aria-label is present]
>> 
>> Steve Faulkner, Thu, 28 Nov 2013 10:24:29 +0000:
>>> Hi Stefan, this only works for criteria that are solely contingent upon
>>> accessibility APIs exposing information to AT.
>>> 
>>> For the case of alt it has not been agreed that this is the case.
>>> 
>>> Ramon, for example brought up the case of a low vision user who turns off
>>> images in the browser because the information in the images is difficult
>> to
>>> perceive, but the alt text exposed as text by the browser is not. This
>>> involves no AT.
>>> 
>>> In this case what is required for all of the suggested alternatives
>>> aria-label etc is that they are displayed in place of an image when an
>>> image is not displayed. This is currently not the case. If we can
>> interest
>>> browser implementers exposing aria-label as text in this case then we
>> have
>>> a practical alternative to alt.
>> 
>> So, to replace @alt with an @aria-* attribute, would be to do the
>> opposite of what the WCAG Robustness principle requires:
>> http://www.w3.org/TR/WCAG20/#robust

>> 
>> Leif H Silli
>> 
>> 
Received on Thursday, 28 November 2013 13:00:10 UTC

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