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Re: Guideline 1.2

From: Charles McCathieNevile <charles@w3.org>
Date: Tue, 9 Jan 2001 13:46:34 -0500 (EST)
To: Frank Gaine <fgaine@frontend.com>
cc: <w3c-wai-ig@w3.org>
Message-ID: <Pine.LNX.4.30.0101091340550.25427-100000@tux.w3.org>
Hi Frank,

in fact you mean checkpoint 1.2 of Web Content Accesibility Guidelines -
there are three and a bit sets of accessibility guidelines, so it is helpful
to be so annoyingly precise.

Screen readers and other non-graphic systems do not know what is under each
pixel of a server-side image map. So it is not clear what the link is to. In
fact the specification suggests that they always send a coordinate of 0,0 to
the server - specifically precluding the possibility of using the links

This is different from a client-side image map, where the specification
provides for alternative text content for each active region. There is a
seperate requirement at a lower priority that redundant versions of these are
also available, due to poor implementation in some browsers.

And yes, this does mean a completely redundant set - repeating the links.


Charles McCN

On Tue, 9 Jan 2001, Frank Gaine wrote:

  Hi All,

  I'm new to this interest group and I don't know if you've covered the
  following at sometime in the past but here goes anyway. I would like to ask
  a question in relation to Guideline 1.2 - it sets out that redundant text
  links should be provided for each active region of a server-side image map.
  What specific difficulties do server-side image maps present for screen
  readers and text only browsers? Does 'redundant text links' mean completely
  seperate (duplicate in fact) hypertext links?

  Thank You

  Frontend ~ Usability Engineering & Interface Design

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Charles McCathieNevile    mailto:charles@w3.org    phone: +61 (0) 409 134 136
W3C Web Accessibility Initiative                      http://www.w3.org/WAI
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Received on Tuesday, 9 January 2001 13:46:52 UTC

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