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Re: Accessibility of ALT texts

From: Charles McCathieNevile <charles@w3.org>
Date: Wed, 11 Apr 2001 06:55:00 -0400 (EDT)
To: "gregory j. rosmaita" <oedipus@hicom.net>
cc: <w3c-wai-gl@w3.org>, Lois Wakeman <lois@lois.co.uk>, <w3c-wai-ua@w3.org>
Message-ID: <Pine.LNX.4.30.0104110633300.3313-100000@tux.w3.org>
Actually, even saner would be to be able to query the image itself for its
description. See, for example, Describing and retrieving photos using RDF and
HTTP - a W3C note at http://www.w3.org/TR/photo-rdf/ which shows how this can
be done.

It should also be possible to do this for out of line images using a service
like Annotea http://www.w3.org/2001/02/Annotea but I haven't managed it yet.
I'll chase the Annotea team to find out if it is me or them...

cheers

Charles McCN

On Wed, 11 Apr 2001, gregory j. rosmaita wrote:

  aloha, again!

  it just struck me as i tried to fall asleep that the sanest syntax (given
  the present state of affairs) with which to link a CSS-generated graphic to
  a textual equivalent/description might be the following (warning: the second
  URI is fictitious):

  background-image: url(http://www.w3.org/QA/images/qabg.png);
  background-image-longdesc:
  url(http://www.w3.org/QA/images/longdesc/qabg.html)
  or
  background-image: url(http://www.w3.org/QA/images/qabg.png);
  background-image-alt: url(http://www.w3.org/QA/images/longdesc/qabg.html)
  or
  background-image: url(http://www.w3.org/QA/images/qabg.png);
  background-image-desc: url(http://www.w3.org/QA/images/longdesc/qabg.html)

  the contents of the background-image-longdesc or background-image-alt or
  background-image-desc could then be pulled inline by the browser/UA to
  provide for an inline textual description if (a) image loading is turned
  off, and (b) the UA is configured to display descriptions of background
  images inline--and, if condition b were met, then the content of the BODY of
  the document referenced by the background-image-longdesc/alt/desc could then
  be rendered in place of the background image, or be made available via a
  context menu type functionality from a placeholder graphic, or be accessible
  in toto via a UA-generated hyperlink, etc.

  perhaps there are 3-levels for which functionality is needed:

  background-image: url(http://www.w3.org/QA/images/qabg.png);
  background-image-alt: "Quality Assurance and Conformance";
  background-image-longdesc:
  url(http://www.w3.org/QA/images/longdesc/qabg.html)

  with the background-image-alt being required if using background-image, or
  perhaps the pseudo-elemental "content" construct (actually, i think the
  correct term is "property") could simply be recycled for the purpose of
  providing a brief textual alternative?

  gregory, who probably should be asleep.


-- 
Charles McCathieNevile    http://www.w3.org/People/Charles  phone: +61 409 134 136
W3C Web Accessibility Initiative     http://www.w3.org/WAI    fax: +1 617 258 5999
Location: 21 Mitchell street FOOTSCRAY Vic 3011, Australia
(or W3C INRIA, Route des Lucioles, BP 93, 06902 Sophia Antipolis Cedex, France)
Received on Wednesday, 11 April 2001 06:55:03 GMT

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