- 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 UTC