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Success criterion 4.2.1 - alternative content

From: Charles McCathieNevile <chaals@opera.com>
Date: Tue, 20 Dec 2005 14:17:08 +0100
To: "WCAG 2 comments" <public-comments-wcag20@w3.org>
Message-ID: <op.s1226ukxwxe0ny@pc063.qadoc.oslo.opera.com>

There are several problems with the requirements for this.

The key problem is that it apparently allows an alternative version which
meets level 1 requirements to be used to satisfy level 3 conformance,
which is a logical failure in the conformance scheme. Either something
like ATAG's relative priority should be used, to ensure that conformance
can only be claimed to the level met by the alternative content, or there
should be success criteria at each level that do the same thing.

Also, as it is explained in "Understanding WCAG":

1. The requirement for a link should specify that at least the link to the
content must meet WCAG conformance at the desired level.

2. The note about user agents that don't support content negotiation is
redundant, since in that case the technique suggested doesn't apply.

cheers

Chaals

-- 
Charles McCathieNevile                     chaals@opera.com
   hablo español  -  je parle français  -  jeg lærer norsk
      Peek into the kitchen: http://snapshot.opera.com/
Received on Tuesday, 20 December 2005 13:17:44 UTC

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