- From: <janina@rednote.net>
- Date: Thu, 7 Jan 2016 11:39:45 -0500
- To: HTML Accessibility Task Force <public-html-a11y@w3.org>, W3C WAI Accessible Platform Architectures <public-apa@w3.org>
Colleagues: This decision pertains to the CfC published to the APA Working Group, with advice of the HTML-A11Y Task Force at: http://lists.w3.org/Archives/Public/public-pfwg/2015Dec/0103.html http://lists.w3.org/Archives/Public/public-html-a11y/2015Dec/0015.html This CfC drew several messages of support, and several suggesting perfecting edits which have been adopted. Therefore, this CfC is agreed as revised below. APA will now forward the following comments on the MSE CR document at: http://www.w3.org/TR/2015/CR-media-source-20151112/ Thanks to all who provided editorial suggestions on the draft comments. Revised Comments The Accessible Platform Architectures (APA) Working Group and the HTML-A11Y Task Force offer the following accessibility related comments on the MSE Candidate Recommendation (URI above): 1.) The diagram in this document should be made accessible. There are several ways to achieve this, including accessible vector graphics with SVG, a link to an external description (standard <a href> or @longdesc), or an in-page description of the graphical content. a.) We provide for your reference a draft textual diagram description, though our draft requires enhancement as per b.) below. The draft description is available at: http://lists.w3.org/Archives/Public/public-apa/2016Jan/0014.html b.) In addition to a textual description of your diagram for the benefit of those readers who cannot see it, wWe find the diagram also does not clearly convey its meaning and may benefit significantly from redesign. Please reconsider what you're trying to convey and determine if there is a more intuitive way to present the data. Please clearly label your switches, connector endpoints, and relationships, e.g. What are the three dots under the video decoders? Are all the audio decoder switches open or is that a drawing error? What is the green circled X that the audio decoders are pointing to? What are the triangles? What is the meaning of the different colors of SourceBuffers? What is the viewer expected to learn from this diagram? c.) Please consider creating this diagram using SVG. We believe it is actually an excellent candidate for the accessible graphic markup approaches being defined by the joint ARIA and SVG Task Force.[2] One member of this TF has already offered to assist, should you decide on SVG. 2.) We would request greater use of prose to describe what the API is doing. This is needed both to help the reader understand what is being specified, but also to test whether the proposed API actually meets its intended purpose. 3.) We believe the MSE is not the appropriate specification to show how multiple media objects, such as the primary video plus a sign-language translation video plus captions plus described video are unencrypted (EME) and synchronized, even when each comes from a different server. However, we believe the W3C needs a high-level overview of how our various specifications fit together to deliver the total user experience defined by HTML and by the Media Accessibility User Requirements (MAUR).[1] We request your assistance in creating this high-level overview document, and in using alternative media examples where appropriate across W3C media specifications in ourder to illustrate for authors and user agent developers how W3C specifications work together to meet the widest possible assortment of user needs. Thank you for your consideration of our comments. Janina Sajka, APA Chair and HTML-A11Y Co-Facilitator [1] http://www.w3.org/TR/media-accessibility-reqs/ [2] http://www.w3.org/WAI/PF/svg-a11y-tf/ -- 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, Accessible Platform Architectures http://www.w3.org/wai/apa
Received on Thursday, 7 January 2016 16:40:12 UTC