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Contrast value and background problem

From: WCAG 2.0 Comment Form <nobody@w3.org>
Date: Sun, 24 Jun 2007 12:44:58 +0000 (GMT)
To: public-comments-wcag20@w3.org
Message-Id: <20070624124458.DFACB6B63E@tibor.w3.org>

Name: levy
Email: aurelien.levy@free.fr
Affiliation: tektonika
Document: UW
Item Number: Understanding Success Criterion 1.4.3
Part of Item: Techniques
Comment Type: technical
Summary of Issue: Contrast value and background problem
Comment (Including rationale for any proposed change):
First i think the 5:1 value is to difficult to achieve currently something like every website will fail (even the w3 website actualy), a 4:1 value seen to be more realistic to me.

The document must be more clear about how to handle text hover background or gradient image, the G18 technique must be more explicit how to test it. For exemple, how many pixel must have the halo to validate ? 

The success and failure technique must repeat (and images of text) in there wording like in the criterion itself to more clear.

For the h21 and f24 i\'m ok for most of the part but i think their is a case where the user must specify there need correclty. For exemple, if the author specify white background color on body element and the user has modified is UA to have black background, the user must change the text color too, it\'s nosense to just modify the background color. 

Futhermore, it\'s to UA to propose alternate style sheet (like opera browser do) and option to render webpage with user preference in everycase

Finaly, there is case where even with good color contrast a text is still difficult to read look at this exemple :


Proposed Change:
Received on Sunday, 24 June 2007 12:45:04 UTC

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