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Re: More ISSUE 30 @longdesc use cases

From: Laura Carlson <laura.lee.carlson@gmail.com>
Date: Tue, 24 Aug 2010 14:11:06 -0500
Message-ID: <AANLkTikTVPDBeJBcj=0XJ8nkPnBwmpmBukp168ER5HPs@mail.gmail.com>
To: "Gregory J. Rosmaita" <oedipus@hicom.net>
Cc: Joshue O Connor <joshue.oconnor@cfit.ie>, HTML Accessibility Task Force <public-html-a11y@w3.org>, HTML WG <public-html@w3.org>, W3C WAI-XTECH <wai-xtech@w3.org>, Barry McMullin <barry.mcmullin@dcu.ie>
Hi Gregory,

I added the examples below and a few others to your Longdesc Retention
Wiki Page.


There are a lot more examples at the CSS Squirrel Comic Strip site. I
didn't add all of those.

Best Regards,

On 8/24/10, Laura Carlson <laura.lee.carlson@gmail.com> wrote:
> Hi Josh,
> Here are a few more longdesc use cases in the wild:
> Federal Deposit Insurance Corporation
> http://www.fdic.gov/regulations/examinations/supervisory/insights/siwin09/Interest_Rate_Risk.html
> http://www.fdic.gov/regulations/examinations/supervisory/insights/siwin09/Interest_Rate_Risk.html
> Hawaii's Public Schools: Seizures Flow Chart
> http://doe.k12.hi.us/specialeducation/SpEdHandbook2006/06appendix_a.htm#SeizureAlgorithm
> http://doe.k12.hi.us/specialeducation/SpEdHandbook2006/06appendix_a_seizure
> flowchartlongdesc.htm
> Interagency Committee on Disability Research (ICDR)
> http://www.icdr.us/atreportweb/sec4/strength.htm#chart3
> http://www.icdr.us/atreportweb/longdesc/chart3.html
> Health and Safety Executive
> http://www.hse.gov.uk/aboutus/strategiesandplans/hscplans/strategicplan0104/plan0104-09.htm#httpwwwhsegovukaboutusstrategiesandplanshscplansstrategicplan0104plan010409longdeschtmLongdescriptionavailable
> http://www.hse.gov.uk/aboutus/strategiesandplans/hscplans/strategicplan0104/plan0104-09longdesc.htm
> Commuter Choice Primer
> Research and Innovative Technology Administration (RITA)  Department
> of Transportation
> http://ntl.bts.gov/lib/jpodocs/repts_pr/13669/section03.htm
> http://ntl.bts.gov/lib/jpodocs/repts_pr/13669/long_desc_figure1.htm
> Best Regards,
> Laura
> On 8/23/10, Joshue O Connor <joshue.oconnor@cfit.ie> wrote:
>> Hi,
>> I have come across a couple of interesting @longdesc use cases. The
>> first is by Laura Carslon which used "A11y Resolved Bug Comparisons"
>> graphs and pie charts. Describing a pie chart and graph like the
>> examples Laura provide would be extremely difficult without an attribute
>> like @longdesc, if you don't want the descriptions to appear inline. [1]
>> To expand on this problem, the need for an off page long descriptor is
>> made even clearer in the following example from 2006 (courtesy of Prof.
>> Barry McMullin of DCU) which he describes as a "Double-negative use
>> case". [2]
>> To explain - I will quote Barry directly from the CFIT website.
>> "Double-negative" because longdesc is not being used here — but I would
>> have liked to use it, and its use would have been absolutely
>> appropriate! It's just that weak user-agent support meant that using it
>> would potentially have left the long description actually unavailable to
>> people who might benefit from it. So instead, I decided to compromise
>> (somewhat) the experience of people who already could perceive the
>> graphical image perfectly well, and exposed the long description for all
>> users (even though it is redundant for the majority). This decision
>> then, logically, had the further effect of requiring an explanation —
>> for those majority users — of what a long description is and why — which
>> explanation, in turn, is redundant for those users who would normally
>> actually benefit from a long description!
>> I humbly suggest that such a convoluted (nay, "traumatic"!) design
>> decision — genuinely existing "in the wild" — should count as legitimate
>> evidence of the use-case-need for longdesc!?" [3]
>> To me the above example, compounds the first and illustrates that an off
>> page long descriptor is very much needed but due to the authors concerns
>> about UA support etc he decided /not/ to use it. This implies that:
>> 1) A long descriptor, that can potentially reference a URI and can be
>> recognised and handled in a way that is conducive to a positive user
>> experience for an AT user is actually needed.
>> 1) The consequences of having to include a very verbose description
>> inline can be problematic in terms of page bloat, potential perceived
>> complexity for users with cognitive disabilities and possibly other
>> usability issues, such as general confusion as to the descriptions
>> purpose for non-users of AT.
>> Josh
>> [1] http://www.d.umn.edu/~lcarlson/html5bugchart/20100821/
>> [2] http://www.aishe.org/readings/2007-1/No-14.html#x20-19300014.6
>> [3] http://www.cfit.ie/news-and-commentary-archive/525-longdesc-rip
> --
> Laura L. Carlson

Laura L. Carlson
Received on Tuesday, 24 August 2010 19:11:44 UTC

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