Try to tab to audio or video (possible) then interact with controls (usually tab and arrows in other browsers)
To be able to focus controls and interact with them
Not possible, unless VoiceOver is running, which you're not likely to be using if you have motor impairments rather than visual.
(apologies if a dupe, but I couldn't find one)
This is a serious accessibility problem preventing use of the default audio/video player and controls. Until it is fixed, we have to work around it with custom controls...a pretty big failing of otherwise useful HTML5 features.
This is resolved (partially) in the Sierra betas. Shadow DOM controls now accept keyboard focus from patch to bug 117857, but visible focus is still hidden on a view due to bug 127260.
*** This bug has been marked as a duplicate of bug 117857 ***
(In reply to comment #3)
> This is resolved (partially) in the Sierra betas. Shadow DOM controls now
> accept keyboard focus from patch to bug 117857, but visible focus is still
> hidden on a view due to bug 127260.
^ on a few.