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[Bug 12794] New: [video] Add a non-normative note on how to provide text alternatives for media elements

From: <bugzilla@jessica.w3.org>
Date: Thu, 26 May 2011 01:52:54 +0000
To: public-html@w3.org
Message-ID: <bug-12794-2495@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=12794

           Summary: [video] Add a non-normative note on how to provide
                    text alternatives for media elements
           Product: HTML WG
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: silviapfeiffer1@gmail.com
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org


People are unclear about the best way in which to provide non-timed text
alternatives for accessibility needs to audio and video elements. Just to be
clear: I'm not talking about captions and audio descriptions here, but about
what a screenreader would say when a user tabs onto a media element on the
page. What would a Web page author need to do.

The proposal is to use the aria attributes for this.

To clarify this, it would be good to add a non-normative example to the spec,
maybe to the WAI-AIRA section or even to the media element section. Something
like:

"Note: To provide non-timed text alternatives for media elements, use aria-*
attributes. The following shows an example of how it can be used to provide
short and long text alternatives to the initially loaded paused video, which
only shows the placeholer image poster.png, and a summary for the video's
content. The example provides this information both to accessibility users and
users in legacy UAs that do not support the media elements.

<video src="file.mp4" poster="poster.png" aria-describedby="posteralt
videosummary">
  <p id="videosummary">A Clockwork Orange Trailer (<a
href="transcript.html">Transcript</a>)</p>
  <p id="posteralt">Poster frame is a clockwork orange movie poster (<a
href="posterlongdesc.html">long description</a>)</p>
  <p><a href="file.mp4">Download the video file</a></p>
</video>
"

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Received on Thursday, 26 May 2011 01:52:56 UTC

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