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Action-219: Draft Response to MSE on Bug 23661

From: Janina Sajka <janina@rednote.net>
Date: Wed, 11 Dec 2013 23:48:52 -0500
To: HTML Accessibility Task Force <public-html-a11y@w3.org>
Message-ID: <20131212044852.GV7703@concerto.rednote.net>
Colleagues:

Herewith, a proposed response to the HTML-WG's Media Task Force and our
comments on their MSE specification as provided in Bug 23661:
https://www.w3.org/Bugs/Public/show_bug.cgi?id=23661

MSE Specification:
https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source-cr.html

The HTML-A11Y Task Force has previously discussed our willingness to
accept the Media Task Force assertion (in response to Bug 23661) that
the javascript approach detailed in the MSE specification is sufficient
to meet accessibility requirements for alternative media, and especially
for simultaneous video streams as is required to support Sign Language
Translation
http://www.w3.org/TR/media-accessibility-reqs/#sign-translation

The HTML-A11Y Task Force believes it important, however, that the core
technical specification implementing media support in HTML 5 explicitly
acknowledge both the alternative media requirements and the sufficiency
of its specification to successfully deploy multiple media streams,
especially multiple video streams, to users who require alternative
media.

We propose, therefore, a brief note in the introductory section of the
MSE specification stating:

	"NOTE: This specification directly supports multiple tracks. It
	explicitly extends the AudioTrack and VideoTrack interfaces to
	allow programmatic control of track kind to enable ,a
	href="http://www.w3.org/TR/media-accessibility-reqs/">Alternative
	Media</a> scenarios, including simultaneous multiple video
	tracks in support of <a
	href="http://www.w3.org/TR/media-accessibility-reqs/#sign-translation">Sign
	Language Translation video tracks</a>."

The Task Force recalls that our requirements for alternative media
support were conveyed to the wider HTML-WG in 2010:
http://lists.w3.org/Archives/Public/public-html/2010Aug/0327.html

Janina


-- 

Janina Sajka,	Phone:	+1.443.300.2200
			sip:janina@asterisk.rednote.net
		Email:	janina@rednote.net

Linux Foundation Fellow
Executive Chair, Accessibility Workgroup:	http://a11y.org

The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
Chair,	Protocols & Formats	http://www.w3.org/wai/pf
	Indie UI			http://www.w3.org/WAI/IndieUI/
Received on Thursday, 12 December 2013 04:49:24 UTC

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