[orca-list] Feature request: support for generic ARIA regions

[Nolan Darilek <nolan thewordnerd info>]

Here's a feature I've missed from NVDA and would like to use more in 
developing web apps, so would like to see in Orca: support for generic 
ARIA regions:

https://www.w3.org/TR/wai-aria/roles#region

In NVDA, when you arrow into a region, you get its description read, 
followed by "region", and then whatever you arrowed to. So if you arrow 
into a page region listing chat channels, you might hear "Channels 
region:" followed by whatever you just arrowed to. This is helpful if 
you're navigating a page non-linearly. Maybe you're arrowing up from the 
bottom, for instance, and because focus didn't land on the Channels 
header, you don't quite know where you are. Or maybe you're searching 
the page for text, and as focus lands in the channels region, you'd hear 
"Channels:" spoken before your search result and had a bit more context 
for the content. If the page is set up correctly, you can be notified 
that the caret has entered the channels region, an area for a specific 
comment, a popup card, etc.

For some good examples, see http://www.loomio.org, whose team is doing 
some awesome work at making their platform accessible and heavily uses 
regions to let you know when you're arrowing into specific areas on the 
page. I've also implemented some support for this into 
https://demo.rocket.chat. It's a very nice way to add meaning to areas 
of the page that don't easily fit within the nav/article/aside tagset.

Thanks.