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Clarifying concept of extension

From: Sailesh Panchang <spanchang02@yahoo.com>
Date: Wed, 7 Oct 2015 10:43:55 -0700
Message-ID: <1444239835.20591.YahooMailBasic@web122101.mail.ne1.yahoo.com>
To: public-comments-wcag20@w3.org
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 17:44:27 UTC

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