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

Re: Survey ready on Media Text Associations proposal

From: Eric Carlson <eric.carlson@apple.com>
Date: Fri, 5 Mar 2010 10:15:35 -0800
Cc: Philip Jägenstedt <philipj@opera.com>, Michael Smith <mike@w3.org>, HTML Accessibility Task Force <public-html-a11y@w3.org>
Message-Id: <7B31CA8D-1493-4060-A87D-38D8968E022B@apple.com>
To: Silvia Pfeiffer <silviapfeiffer1@gmail.com>

On Mar 4, 2010, at 9:21 PM, Silvia Pfeiffer wrote:

>> Do you still want to keep the
>> enabled *property* so that scripts can switch between different tracks of a
>> group, just like the browser context menu?
> I assume you are referring to the JavaScript API with *property*? If
> so, yes, I think a Web Developer should be able to set a default
> through the @enable attribute, and ask the track about its state
> through the enabled property, then be allowed to react accordingly.
  I agree.

>> I am not very optimistic about UA
>> track selection being very useful being applying the 'media' attribute.
> Those media queries that apply to this (as well as the video element)
> actually still need to be defined. As with the JavaScript API, we
> could decide to leave the media attribute out for the moment and add
> it at a later state when we are sure that we actually have media
> queries that help in the resource selection process.
  I think 'media' will be extremely useful for describing the accessibility affordances in optional external tracks. 

<trackgroup media="accessibility(audiodescription:yes)" >
    <track src="en.wav" lang="en" enabled >
    <track src="fr.wav" lang="fr" >
    <track src="de.wav" lang="de" >

> Incidentally - have any browser vendors implemented support for the
> @media attribute on the video and audio elements? I'd be curious about
> test cases there and whether they apply to external text associations.
  WebKit supports media queries on the <source> element.

Received on Friday, 5 March 2010 18:16:13 UTC

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