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

From: Sean Hayes <Sean.Hayes@microsoft.com>
Date: Wed, 21 Mar 2012 13:01:27 +0000
To: Charles Pritchard <chuck@jumis.com>, John Foliot <john@foliot.ca>
CC: '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 <Paul.Cotton@microsoft.com>, "public-html-a11y@w3.org" <public-html-a11y@w3.org>, "public-html@w3.org" <public-html@w3.org>
Message-ID: <E9A92BD0A4FC934EB7935470A46D15240906C642@DB3EX14MBXC325.europe.corp.microsoft.com>
I may be missing something in your example, but it looks to me as if on loading the page the poster image will appear twice, and then the second image does not disappear as the video starts. It may work from an ARIA perspective, but from a design POV I don't see this as a solution to the issue, can you elaborate how this is supposed to work?

-----Original Message-----
From: Charles Pritchard [mailto:chuck@jumis.com] 
Sent: 21 March 2012 07:55
To: John Foliot
Cc: 'Silvia Pfeiffer'; 'David Singer'; janina@rednote.net; "'xn--mlform-iua@målform.no'"; rubys@intertwingly.net; laura.lee.carlson@gmail.com; mjs@apple.com; Paul Cotton; public-html-a11y@w3.org; public-html@w3.org
Subject: Re: CP, ISSUE-30: Link longdesc to role of img [Was: hypothetical question on longdesc]

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.

It looks kind of ok from an ARIA perspective, though it still loses a 
little something from non-aria.
I've argued we may want to look at allowing users/authors more easy 
access to displaying fallback content.

In that case, the typical user could both see the longdesc, and see the 
fallback content (and then follow that longdesc).


-Charles
Received on Wednesday, 21 March 2012 13:02:35 UTC

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