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[Bug 12587] AT shouldn't see img@alt="" and img@role=presentation as 100% synonyms

From: <bugzilla@jessica.w3.org>
Date: Tue, 03 May 2011 13:01:32 +0000
To: public-html-a11y@w3.org
Message-Id: <E1QHFEK-0005uC-Hs@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=12587

--- Comment #2 from Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no> 2011-05-03 13:01:31 UTC ---
Here is the approach which the 'HTML to Platform Accessibility APIs
implementation guide' should take:

1. The AT should first run an algoritm to *calculate* whether the IMG
     is presentational or non-presentational
2. If it is non-presentational, AT should select the best text substitute

When it comes to the algorithm to calculate whether IMG is presentational or
not, then I have suggested how it should look in my 'Validity map for <img>':

http://lists.w3.org/Archives/Public/public-html/2011Mar/0750

Two examples from that algorithm:

* If IMG has non-empty @title, then AT should consider 
   the IMG as non-presentational,  regardless of @alt's value.
* Ditto if IMG has @aria-labelledby  - regardless of @alt's value.

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