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Re: Clarifying concept of extension

From: Andrew Kirkpatrick <akirkpat@adobe.com>
Date: Wed, 7 Oct 2015 22:16:34 +0000
To: Sailesh Panchang <spanchang02@yahoo.com>, "public-comments-wcag20@w3.org" <public-comments-wcag20@w3.org>
Message-ID: <1C16583F-7C4A-48D5-99CE-A67DBA632EF5@adobe.com>
Sailesh just reminded me that I’m backwards in thinking that he was thinking backwards.  It would be correct to say that 5:1 is a “tougher” requirement than 4.5:1.  Thanks for setting me straight...


Andrew Kirkpatrick
Group Product Manager, Accessibility



On 10/7/15, 13:43, "Sailesh Panchang" <spanchang02@yahoo.com> wrote:

>With reference to  https://www.w3.org/WAI/GL/wiki/WCAG_Extensions_Framework

>1. Consider incorporating these statements right before the sentence beginning with ,"The underlying goal of each extension is...":
>A WCAG2 Eextension is a vehicle for defining accessibility requirements  over and above  what is contained in the normative part of WCAG 2.0; in other words an extension extends a certain  part of WCAG 2.0 without actually changing WCAG 2.0. 
>Once an extension becomes a W3C recommendation, authors may choose to make their Web content conform with this extension too in addition to the minimum conformance at the desired WCAG 2.0 level.
>2. With regard to, " Extension specifications are expected to offer modifications to existing WCAG 2.0 success criteria" 
>Clarify the above with an example like:
>Although SC 1.4.3 AA requires  a minimum ratio of 4.5 to 1, an extension requirement at Level AA may say the minimum is 5 to 1.
>Or, an extension may bump up  2.4.7 Level AA to Level A. 
>(These are mere examples to further the understanding of an extension's purpose).
>Just my thoughts.
>Sailesh Panchang
Received on Wednesday, 7 October 2015 22:17:13 UTC

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