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Re: CP, ISSUE-30: Link longdesc to role of img [Was: hypothetical question on longdesc]

From: Steve Faulkner <faulkner.steve@gmail.com>
Date: Wed, 21 Mar 2012 10:16:36 +0000
Message-Id: <B4CB8DFE-15FD-4952-AFA1-1A798F981499@gmail.com>
Cc: Charles Pritchard <chuck@jumis.com>, John Foliot <john@foliot.ca>, Silvia Pfeiffer <silviapfeiffer1@gmail.com>, David Singer <singer@apple.com>, "janina@rednote.net" <janina@rednote.net>, "xn--mlform-iua@målform.no" <xn--mlform-iua@xn--mlform-iua.no>, "rubys@intertwingly.net" <rubys@intertwingly.net>, "laura.lee.carlson@gmail.com" <laura.lee.carlson@gmail.com>, "mjs@apple.com" <mjs@apple.com>, "paul.cotton@microsoft.com" <paul.cotton@microsoft.com>, "public-html-a11y@w3.org" <public-html-a11y@w3.org>, "public-html@w3.org" <public-html@w3.org>
To: Benjamin Hawkes-Lewis <bhawkeslewis@googlemail.com>
Hi Ben,

"ARIA is being implemented as an AT-only access mechanism."

This does not have to be the case, it's not a requirement in ARIA or HTML5 and for example there has been positive discussions with the Firefox acc team in regards to exposing landmarks to keyboard users.

Regards
Stevef

Sent from my iPhone

On 21 Mar 2012, at 10:08, Benjamin Hawkes-Lewis <bhawkeslewis@googlemail.com> wrote:

> On Wed, Mar 21, 2012 at 7:55 AM, Charles Pritchard <chuck@jumis.com> wrote:
>> On 3/20/2012 11:18 PM, John Foliot wrote:
>>> 
>>> This is the very same reason why aria-describedby cannot point to "hidden"
>>> text, as it too will be flattened to the same string text, using the same
>>> computational rules.
>> 
>> 
>> Can we get by with aria-describedby pointing to an embedded image tag?
>> 
>> <video poster="poster.jpg" aria-describedby="poster"
>> longdesc="videolongdesc.html" aria-label="My video">
>> <a href="videolongdesc.html" title="My Video"><img id="poster"
>> src="poster.jpg" longdesc="posterlongdesc.html" alt="My Poster" /></a>
>> </video>
>> 
>> We're pointing aria-describedby at an element with special semantics: img
>> @longdesc, and it's not a display: none/@hidden element,
>> so we're not violating any laws there... though I would have no expectation
>> that the img could gain focus as fallback for video.
> 
> I think that is not going to work since:
> 
> 1. Image descriptions need to accessible via mainstream browser UI and
> ARIA is being implemented as an AT-only access mechanism.
> 
> 2. Under the recent edits PFWG has been making, non-rendered fallback
> for <video> would arguably fall under "Elements, including their
> descendents, that have host language semantics specifying that the
> element is hidden, such as CSS display:none or visibility:hidden or
> HTML 5 hidden attribute". ("hidden" is not properly defined here ...
> I've provided some feedback requesting it be defined.) Consequently
> the @longdesc link would not be accessible even to AT.
> 
>    http://www.w3.org/WAI/PF/aria-implementation/#exclude-elements
> 
> --
> Benjamin Hawkes-Lewis
> 
Received on Wednesday, 21 March 2012 10:20:47 UTC

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