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Re: Alternative presentation of content

for

From: Jonathan Avila
Date: Jan 4, 2018 8:12PM

Alan, I think you will need to carefully look at the term Synchronized Media

From WCAG: audio or video synchronized with another format for presenting information and/or with time-based interactive components, unless the media is a media alternative for text that is clearly labeled as such
(The understanding document for SC 1.2.3) https://www.w3.org/TR/UNDERSTANDING-WCAG20/media-equiv-audio-desc.html

If the slides auto advance and the user would be expected to separately listen to one and then go back and read the other than that sounds like you have synchronized media and thus a synchronized alternative would be required. If your proposed pop-up could be treated like captions or turned into something like extended audio descriptions via aria-live regions then you could be able to make an argument that it is a synchronized alternative. At what granularity text has to be synchronized is required is not totally clear. For example, general captioning best practices would not consider displaying a large amount of text as synchronized -- but if you were able to highlight the spoken text in that transcript that highlight likely could be considered synchronized. The highlighted transcript would need to be a true transcript indicating all things required for captions such as speaker and other non-decorative sounds, etc.

Jonathan

Jonathan Avila
Chief Accessibility Officer
Level Access, inc. (formerly SSB BART Group, inc.)
(703) 637-8957
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