[whatwg] Introduction of media accessibility features

[Robert O'Callahan]

It would be helpful if the "role" values were defined.

If the text is rendered on top of the video, rendering engines must ensure
> that the rendered text does not collide with other elements rendered on top
> of the video, e.g. controls.
>

This needs to be clarified. Authors can position arbitrary content over the
video, and presumably the browser is not supposed to ensure rendered text
doesn't collide with such content. I presume what you meant is simply that
rendered text must not collide with browser built-in UI. Although I'm not
sure how that can be ensured when arbitrary styling of the rendered text is
supported.

Rob
-- 
"He was pierced for our transgressions, he was crushed for our iniquities;
the punishment that brought us peace was upon him, and by his wounds we are
healed. We all, like sheep, have gone astray, each of us has turned to his
own way; and the LORD has laid on him the iniquity of us all." [Isaiah
53:5-6]
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