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RE: 1.4.3

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Tue, 20 Nov 2007 11:13:17 -0600
To: 'David MacDonald' <befree@magma.ca>, w3c-wai-gl@w3.org
Message-id: <00a601c82b98$a479d3d0$5e0b2148@NC84301>
Correct -  and very nice. 

 

Thanks David.   I struggled a long time on that and didn't see it.   

 


Gregg
 -- ------------------------------ 
Gregg C Vanderheiden Ph.D. 

 

 


  _____  


From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of David MacDonald
Sent: Tuesday, November 20, 2007 9:56 AM
To: 'Gregg Vanderheiden'; w3c-wai-gl@w3.org
Subject: RE: 1.4.3

I was confused when I first read "where no minimum contrast is required" it
made the sentence long and hard to parse. I thought that the word "where"
was the beginning of a conditional phrase. If #2 is an exception then the
5:1 ratio doesn't apply and we needn't say "where no minimum contrast is
required."

 

If necessary we could clarify it in the understanding.

 

How about:

 

===============

 

1.4.3 Contrast (Minimum): Text <http://www.w3.org/WAI/GL/WCAG20/#textdef>
and images of text have a contrast ratio
<http://www.w3.org/WAI/GL/WCAG20/#contrast-ratiodef>  of at least 5:1,
except for 

1)large-scale <http://www.w3.org/WAI/GL/WCAG20/#larger-scaledef>  text and
images of text that have a contrast ratio of at least 3:1, and 

2)text or images of text that are part of an inactive user interface
component, that are pure decoration
<http://www.w3.org/WAI/GL/WCAG20/#puredecdef> , that are incidental text in
an image <> , or that are not visible to anyone.  (Level AA) How to Meet
1.4.3
<http://www.w3.org/WAI/WCAG20/quickref/20071102/Overview.php#visual-audio-co
ntrast-contrast>  Understanding
<http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071102/visual-aud
io-contrast-contrast.html>  1.4.3

 

 

Definition: incidental text in an image

 

Proposed:

Text that is inconsequential to the meaning of the image.

 

Example: In a photo of two men talking on a street corner, there is a sign
on a store in the background.

 

 

access empowers people...

        ...barriers disable them...

 

www.eramp.com

From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Gregg Vanderheiden
Sent: Monday, November 19, 2007 4:07 PM
To: w3c-wai-gl@w3.org
Subject: FW: 1.4.3

 

In doing a consistency review of 1.4.3 I noted how complex  it had become
and how different than our past version or the TEITAC version. 

 


Current form of 1.4.3


1.4.3 Contrast (Minimum): Text <http://www.w3.org/WAI/GL/WCAG20/#textdef>
and images of text have a contrast ratio
<http://www.w3.org/WAI/GL/WCAG20/#contrast-ratiodef>  of at least 5:1, and
large-scale <http://www.w3.org/WAI/GL/WCAG20/#larger-scaledef>  text and
images of text have a contrast ratio of at least 3:1, except for the
following: (Level AA) How to Meet 1.4.3
<http://www.w3.org/WAI/WCAG20/quickref/20071102/Overview.php#visual-audio-co
ntrast-contrast>  Understanding
<http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071102/visual-aud
io-contrast-contrast.html>  1.4.3

*    Inactive User Interface: If text content is part of an inactive user
interface component, then no minimum contrast requirement applies.

*    Decoration or Incidental: If text content is pure decoration
<http://www.w3.org/WAI/GL/WCAG20/#puredecdef> , or is incidental text in an
image, then no minimum contrast requirement applies.

*    Invisible: If text is not visible to anyone, then no minimum contrast
requirement applies.

Note: Success Criteria 1.4.3 and 1.4.5 can be met via a contrast control
available on or from the page.

 

 

 

There is a lot of redundancy.    

 

Also we want to harmonize with TEITAC if we can 

 

Here is their version

 


TEITAC VERSION


 

Except for large-scale text, presentation of text (and images of text) in
electronic documents must have a default contrast ratio of at least 5:1,
except if the text is unavailable items or pure decoration. Large-scale text
(or images of large-scale text) can allow a contrast ratio of at least 3:1.

 

 

 


NEW PROPOSED VERSION


 

 

How about the following.  

 

 

1.4.3 Contrast (Minimum): Text <http://www.w3.org/WAI/GL/WCAG20/#textdef>
and images of text have a contrast ratio
<http://www.w3.org/WAI/GL/WCAG20/#contrast-ratiodef>  of at least 5:1,
except for 

3)large-scale <http://www.w3.org/WAI/GL/WCAG20/#larger-scaledef>  text and
images of text that have a contrast ratio of at least 3:1, and 

4)text or images of text that are part of an inactive user interface
component, that are pure decoration
<http://www.w3.org/WAI/GL/WCAG20/#puredecdef> , that are incidental text in
an image, or that are not visible to anyone, where no minimum contrast is
required.  (Level AA) How to Meet 1.4.3
<http://www.w3.org/WAI/WCAG20/quickref/20071102/Overview.php#visual-audio-co
ntrast-contrast>  Understanding
<http://www.w3.org/WAI/GL/WCAG20/WD-UNDERSTANDING-WCAG20-20071102/visual-aud
io-contrast-contrast.html>  1.4.3

Note: Success Criteria 1.4.3 and 1.4.5 can be met via a contrast control
available on or from the page.

 

This should not change the meaning but should clean it up a lot.

 

 


Gregg

------------------------

Gregg C Vanderheiden Ph.D. 
Professor - Depts of Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 
< <http://trace.wisc.edu/> http://trace.wisc.edu/> FAX 608/262-8848  

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Received on Tuesday, 20 November 2007 17:13:31 GMT

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