W3C home > Mailing lists > Public > public-html-a11y@w3.org > September 2010

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

From: <bugzilla@jessica.w3.org>
Date: Thu, 30 Sep 2010 17:38:42 +0000
To: public-html-a11y@w3.org
Message-Id: <E1P1N5e-0001Yv-DY@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10642

Ashley Ward <ash@netality.com> changed:

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--- Comment #20 from Ashley Ward <ash@netality.com> 2010-09-30 17:38:41 UTC ---
There is a definite technical problem with providing alt text for an
automatically chosen poster image as this would, presumably, be chosen by the
user agent and so could not be determined when the HTML is created.

However, if a site developer has chosen to add an explicit poster image to a
video implies that there is some information/mood which the developer
specifically wishes to be conveyed. They must therefore be allowed a method of
conveying this same information to all users, including those using screen
readers.

This would also be different to the title of the movie as Everett's comment
pointed out.

Perhaps in terms of implementing this alt text, a better idea may be to add
another attribute to the video element rather than as a child element to the
video:

<video poster="poster.jpg" posteralt="Poster alt text">
..
</video>

This would mean that the content within the video element is still purely for
user agents which don't understand it, and this would also mean that it is
backwards compatible and existing html which is already using the video element
would not need updating (and we wouldn't then need user agents to support both
the attribute based for older sites and child element based for newer sites).

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Received on Thursday, 30 September 2010 17:38:44 UTC

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