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Re: [techs] test 178 was Table Summary Tests (111, 112, 113, 114, 203)

From: Chris Ridpath <chris.ridpath@utoronto.ca>
Date: Tue, 23 Aug 2005 10:37:02 -0400
Message-ID: <016f01c5a7f0$207bc8a0$e29a968e@WILDDOG>
To: "Johannes Koch" <koch@w3development.de>, "WAI-GL" <w3c-wai-gl@w3.org>
Cc: "Joe Clark" <joeclark@joeclark.org>, "Gian Sampson-Wild" <giansw@ifocus.com.au>

Our test 178 requires that all non decorative images, except those used as 
anchors, have alt text.
http://www.w3.org/WAI/GL/WCAG20/tests/test178.html

Joe and others have suggested that you can set the alt text to null ("") if 
there is text immediately preceding or following the image that describes 
the image.
http://joeclark.org/book/sashay/serialization/Chapter06.html#h2-4840

It's common practice to display images with this sort of text. Here's one 
random example:
http://www.kitp.ucsb.edu/other/staff/
(In this example the alt attributes are missing and should be present.)

We've already recoginzed that duplicate alt text can be an accessibility 
problem with test 175 - alt text for anchor images is different from the 
link text:
http://www.w3.org/WAI/GL/WCAG20/tests/test175.html

Should test 178 be modified to require (or at least allow) alt text to be 
null if text immediately preceeding or following the image describes the 
image?

Cheers,
Chris
Received on Tuesday, 23 August 2005 14:37:32 GMT

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