Re: Acessibility of <audio> and <video>

NOTE:  Please be careful with replies here.  Because the subject alas 
touches on accessibility, HTML, and CSS I have included all those 
groups (I hope), and also BCC'd WhatWG.  If you're in WhatWG, please 
note that the discussion here started on public-html and so I am 
encouraging it to stay there.

We've actually been thinking about the framework for accessibility of 
media elements in HTML5.  Note that this is rather different from 
discussing (say) caption formats or the like.  I've attached a 
'thought piece' on the subject, which attempts to lay out some of the 
needs as we see them, and also proposes a way ahead.

Comments gratefully received;  this is an important subject, yet 
subtle.  Good accessibility is quite tricky.  If the spec doesn't 
provide the right framework, or it's unworkable from the point of 
view of authors or users, you fail, no matter how good your 
intentions...


-- 
David Singer
Apple/QuickTime