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[Bug 17463] 'sign' and 'captions' as attributes

From: <bugzilla@jessica.w3.org>
Date: Tue, 12 Jun 2012 12:43:20 +0000
To: public-html-a11y@w3.org
Message-Id: <E1SeQRM-0006xc-D4@jessica.w3.org>

--- Comment #3 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> 2012-06-12 12:43:19 UTC ---
(In reply to comment #2)
> This is what I have in mind: Users who interrogate pages using commands like
> the links list (say, on YouTube), will get something like, 'Video Name XYZ 1,
> Signing available, Captions not available, Transcript available'; 'Video Name
> XYZ 2, Signing Not available, Captions not available, Transcript not available'
> etc.
> I would like to know if such attributes can be exposed for video. Could AT
> vendors use these values?

We already have markup for captions, video descriptions, synchronized video
like sign language video, and synchronized audio like audio descriptions. We
are currently solving the transcript use case (see bug 12964). All of these
will be machine discoverable, so a screen reader does indeed have all
functionality available from HTML for making the announcements that you are
asking for.

> Coming to your proposed use case, yes, making the video tabfocusable would
> work, but isn't that already happening? Wouldn’t it help when assistive
> technology could announce / convey information regarding these attributes
> (discussed above) when the video has keyboard focus?

It is possible to focus on the video element with AT, i.e. your screenreader
may choose to focus on video and audio elements. However, my last test has
shown that neither VoiceOver nor ChromeVox provide focus on audio and video
elements. And neither does the browser in their default tabfocus. I had to put
explicit @tabindex attributes onto the media elements to allow them to receive

As the video is specified right now, it is not tabfocusable and only
interactive when it has controls. Thus, the interaction that you are after with
announcing information when the video has keyboard focus can't be achieved.

I would like to refocus this bug on this problem if it's ok, seen as the
information that you are after is already available through text tracks and
synchronized media resources.

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Received on Tuesday, 12 June 2012 12:43:25 UTC

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