links should probably not be focusable (outside the walker)

[pkra]

Currently, MathJax hides children of its output root via aria-hidden but links remain in the tab order, i.e., users can then tab to an element that's not in the accessibility tree. While UAs apply conflict resolutions rules, it's not great to get errors for this kind of thing.

I realize that in v3, this may be necessary as the links become inaccessible by keyboard otherwise. But perhaps with v4 links can be removed from the tab order since the walker will become the default.

[dpvc]

Thanks for the suggestion. Volker and I will discuss it and see what we can come up with.

[pkra]

Thanks, Davide. Happy to chat about this some time.

[dpvc]

The PR at mathjax/MathJax-src#1335 implements a means of dealing with the links internal to an expression that I think does what you are suggesting.