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The test for the correct use of longdesc should be conditional on its application

From: <noreply@w3.org>
Date: Tue, 04 Jan 2011 13:18:07 +0000
To: public-comments-wcag20@w3.org
Message-Id: <E1Pa6m7-0000oj-Tu@lowblow.w3.org>

Name: Detlev Fischer
Email: fischer@dias.de
Affiliation: DIAS GmbH
Document: TD
Item Number: H45
Part of Item: Applicability
Comment Type: general comment
Summary of Issue: The test for the correct use of  longdesc should be conditional on its application
Comment (Including rationale for any proposed change):
The test for the correct use of  longdesc should be conditional on its application in the first place. The first check 

1. Check that the img element has a longdesc 
attribute. 
 is not meaningful for any img and redundant for those that actually carry the longdesc attribute.

(The descripton may also mention the drawback that alternative text via longdesc is not usually accessible to sighted users and might therefore be supplied redundantly.)



Proposed Change:
So the test in my opinion should start with a conditional:

"If longdesc is used on images to supply alternative text:"

...then test #2 and #3 (as #1 and #2) 
Received on Tuesday, 4 January 2011 13:18:09 UTC

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