RE: captions accessibility with screen readers.

If you use a screen reader because you are visually impaired but you are not also deaf or hard of hearing then I’d expect captions announced with aria-live to be distracting or even a barrier to listen to the narration of the video.  In these cases the user generally is able to turn off the captions.  However, I could imagine a situation where others in the room who are also watching the video need them on at the same time.   So it would be best to have an option for whether captions use live regions or not.

Separately, people who are deafblind also need captions.  The question would be in what situations would the captions that show up with aria-live be better than a full transcript?  1) Full transcripts are not required if captions/audio descriptions are already provided 2) people watching videos with others would want the experience at the same time.     This is complicated by my experience that ARIA live regions aren’t shown on Braille displays when used with screen readers like JAWS and NVDA.  So the potential benefits for the deafblind might not be totally met.  Captions being in text that is available to screen reader isn’t even a requirement – so again another reason why a full transcript could be beneficial or requiring captions to be programmatically determinable might be helpful.

Jonathan

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From: Nigel Megitt <nigel.megitt@bbc.co.uk>
Sent: Monday, December 17, 2018 6:30 AM
To: Sean Murphy (seanmmur) <seanmmur@cisco.com>
Cc: W3C WAI ig <w3c-wai-ig@w3.org>
Subject: Re: captions accessibility with screen readers.

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Yes they should, in my opinion, role=“alert” aria-live="assertive”.  If you’re watching video with captions, you’re probably not interacting with the rest of the page so much. However I can see that there may be a case here for changing this depending on whether the video is full screen or not. Certainly in the case of a page with a whole bunch of captioned videos, if more than one is playing simultaneously, this would be a usability nightmare (think social media pages with lots of videos embedded), so something more subdued is needed. I don’t think I’ve seen a UX pattern for this that really works yet, but I’d like to learn more about how this might be possible.


On 17 Dec 2018, at 04:49, Sean Murphy (seanmmur) <seanmmur@cisco.com<mailto:seanmmur@cisco.com>> wrote:

Thoughts from the wider community.

I am wanting to bounce something off the community in relation to accessible media controls. Should the captions be accessible to a screen reader? When the caption is, the useability of the web page and general usage suffers due to much information.

So should the captions be accessible by a screen reader? If so, what ARIA property should be used? As ARIA-live=”polite” is to verbose.




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