I tried signing into win messenger through that link Will, and I
found with my limited vision that voiceover is not interacting with
the html, because there is no html to interact with. The page is
completely blank. Maybe it is not supported by safari.
I will grant that I have had experiences where VO did not interact
with pages before, but I could never envoke it on purpose. it always
just sort of happened at randomh and with no reason and I would have
to restart safari and voiceover to make it work again.
Regards
Justin Harford