- 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>
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