W3C home > Mailing lists > Public > public-comments-wcag20@w3.org > June 2007

Comment LC-1042

From: Gian Sampson-Wild <gian@tkh.com.au>
Date: Tue, 26 Jun 2007 11:12:41 +1000
To: "'Loretta Guarino Reid'" <lorettaguarino@google.com>
Cc: <public-comments-WCAG20@w3.org>
Message-ID: <001501c7b78f$1a43b640$b300a8c0@tkhcomputer>

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Comment 22:

Source: http://www.w3.org/mid/000901c69538$2e394450$f4c9b23a@tkhcomputer
(Issue ID: LC-1042)

Content negotiation: In Conformance it says "Note: If multiple
representations can be retrieved from a URI through content negotiation,
then the conformance claim would be for the Web unit that is returned when
no negotiation is conducted (unless the server returns an error for that
condition, in which case one of the negotiated forms must comply)". Does the
WG mean that if there is content negotiation, that only one version of the
content need be accessible? What about if one version of content provides
more information than the accessible version? That would be a violation of
WCAG1 and should be a violation of WCAG2

Proposed Change:

Firstly it should be required that all content from different
representations is available from the accessible version. Secondly, at Level
3 it should be required that all versions of content should be accessible.

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Response from Working Group:
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The content negotiation requirement has been removed. Alternate version is
defined as "a version that provides all of the same information and
functionality in the same human language and is as up to date as the
non-conforming content" Because multiple versions may be provided to
accommodate different sets of accessibility-supported Web technologies, to
be tuned to specific disabilities, or to accommodate vagaries of different
browsers, WCAG does not require that all versions satisfy all the success
criterion for any level of conformance. Only one version needs to fully
conform. We do require
that: 4.) Alternate Versions: If the Web page does not meet all of the
success criteria for a specified level, then a mechanism to obtain an
alternate version that meets all of the success criteria can be derived from
the nonconforming content or its URI, and that mechanism meets all success
criteria for the specified level of conformance. The alternate version does
not need to be matched page for page with the original (e.g. the alternative
to a page may consist of multiple pages). If multiple language versions are
available, then conforming versions are required for each language offered.

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Response from GSW:
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Thank you for taking my comment into account.
Received on Tuesday, 26 June 2007 01:12:55 UTC

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