Comment / question re. Requirements for WCAG 2.0 Extensions

Ref: https://www.w3.org/TR/wcag2-ext-req/

Comment 1. relating to Section 2.2

Reference: "The result of this is that when a page conforms to WCAG
2.0 with an extension, it must also conform to WCAG 2.0 if the
extension is not considered in the conformance review".
Consider if this makes it more explicit and clearer:
The result of this is that a page that claims conformance to WCAG 2.0
plus an extension must also independently conform with all
requirements  of WCAG 2.0 at the stated level without considering the
extension.

Comment 2:   relating to Section 2.2 examples
I find this line a bit unclear:
Reference: "Existing success criterion may be modified, but the
resulting change must still satisfy WCAG 2.0 success criteria"

Maybe it can be re-worded:
"An existing success criterion can be modified by the extension in a
manner that it adds additional conformance requirements without
diluting or decreasing what is already required by the success
criterion in WCAG 2.0.

Comment 3: relating to Section 2.5:
Reference: "When a page conforms to an extension at a specific level,
that page must conform to WCAG 2.0 at the same level".
Question:
This will discourage a page author claiming conformance with Level A
WCAG 2.0 from  meeting  a particular extension  that covers  certain
Level AA  requirements. Maybe the page author does not choose to meet
all Level AA requirements except those covered  by this particular
extension.
So why can the author not say the page conforms with WCAG Level A + Extension X?
This  will be more in line with what I understand from the statement
in Section 2.4:
"Extensions must specify that conformance claims indicate that a page
conforms to WCAG 2.0 as a base, and to the extension as an additional
layer of conformance."

Thanks,

Sailesh Panchang
Principal Accessibility Consultant
Deque Systems Inc
Phone 703-225-0380 ext 105
Mobile: 571-344-1765

Received on Wednesday, 3 February 2016 17:03:09 UTC