W3C home > Mailing lists > Public > w3c-wai-ua@w3.org > October to December 2000

Re: SVG, Style, Resizing, Etc.

From: Ian Jacobs <ij@w3.org>
Date: Fri, 06 Oct 2000 10:44:08 -0400
Message-ID: <39DDE538.1E12CF0E@w3.org>
To: Jon Gunderson <jongund@ux1.cso.uiuc.edu>
CC: Al Gilman <asgilman@iamdigex.net>, w3c-wai-ua@w3.org, kasday@ACM.org, Bruce_Bailey@ed.gov
Jon Gunderson wrote:
> Al,
> The colors user for rendering the graphic is often more important than size
> for some people with visual impairments.  It depends on what part of the
> eye is affected.  So we need to include foreground and background color in
> the mix for full consideration of accessibility for people with low vision.

1) I could imagine a checkpoint (though I don't think we should add it
at this point)
   that the user be able to control all colors in a document, within the
same range
   available to the author. The current UAAG 1.0 only covers
   colors for text and not for graphical objects such as splines. Here's
why I don't
   think we should address this issue at this time: we have not had any
   at all about the usability or accessibility requirements of
overriding colors for
   portions of images or graphics. I don't think we should attack a new
problem 10
   days before going to last call. It can wait until another version.

2) SVG colors can be specified with CSS style sheets and so allow user
override of
   author and user agent defaults. 

 - Ian

> At 10:24 PM 10/5/2000 -0400, Al Gilman wrote:
> >[Len, Bruce: the reference thread is at
> >  http://lists.w3.org/Archives/Public/w3c-wai-ua/2000OctDec/thread.html#4 ]
> >
> >According to Bruce Bailey's report
> >
> >   http://lists.w3.org/Archives/Public/w3c-wai-ig/2000OctDec/0012.html
> >
> >if you can force the text up in size you have solved the P2 problem.  Icons
> >don't seem to be the same severity of problem.
> >
> >This would sound as though, modulo a possible P3 gap, you are probably
> >covered as is.
> >
> >I am copying Len and Bruce on this as I feel a bit over my depth.  I don't
> >have that good a background in low vision.
> >
> >Al
> >
> >On second thought that bit about icons is not so strange.  Icons are analog
> >encoding.  This means you would expect them to degrade gradually on
> >low-pass filtering where all you get is an outline, more or less.  Text
> >doesn't look like it sounds.  You have to correctly identify the letters.
> >Fuzz text and all the letters without ascenders or descenders look alike;
> >that's an awful lot of them!  Symbolic codes have better error rejection
> >for low error rates.  That's why digital and FM before it deliver high
> >fidelity.  But like the little girl with the little curl; when they are
> >bad... watch out!
> Jon Gunderson, Ph.D., ATP
> Coordinator of Assistive Communication and Information Technology
> Division of Rehabilitation - Education Services
> MC-574
> College of Applied Life Studies
> University of Illinois at Urbana/Champaign
> 1207 S. Oak Street, Champaign, IL  61820
> Voice: (217) 244-5870
> Fax: (217) 333-0248
> E-mail: jongund@uiuc.edu
> WWW: http://www.staff.uiuc.edu/~jongund
> WWW: http://www.w3.org/wai/ua

Ian Jacobs (jacobs@w3.org)   http://www.w3.org/People/Jacobs
Tel:                         +1 831 457-2842
Cell:                        +1 917 450-8783
Received on Friday, 6 October 2000 10:44:13 UTC

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