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[Bug 10642] No alternative text description for video key frame (poster)

From: <bugzilla@jessica.w3.org>
Date: Fri, 01 Oct 2010 14:16:43 +0000
To: public-html-a11y@w3.org
Message-Id: <E1P1gPj-0005XG-6V@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10642

--- Comment #29 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> 2010-10-01 14:16:41 UTC ---
(In reply to comment #27)
> (In reply to comment #26)
> > This
> > also applies to the first frame displayed if no explicit poster frame is
> > provided. Since it's either this first frame or the explicitly linked image,
> > covering them both the same way makes sense.
> 
> The trouble with providing poster alt text when no explicit poster image is
> given is that we can't be sure that the UA will choose the first frame. It may
> choose the middle frame, or the first non-blank frame.

Maybe in theory. But in practice all browser use the very first frame, because
that is the first data downloaded together with the metadata. We might as well
specify the use of the first frame for default posters in the spec if there is
a loophole for compatibility across browsers.

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Received on Friday, 1 October 2010 14:16:48 GMT

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