[orca-list] What makes Orca speak dynamic page updates automatically?

["Nolan Darilek" <nolan thewordnerd info>]

Hi, all. I'm starting to delve into the world of developing accessible 
AJAX websites, and am having issues. I notice that Orca sometimes does a 
great job of speaking dynamic page updates. For instance, see this 
XMPP-based web chat that speaks very nicely:
http://superfeedr.com/chat

I've got the source to that, and there's not a bit of ARIA in sight--at 
least, none that I'm aware of. Yet it speaks very nicely.
I'm working on something vaguely similar, and I have javascript code 
appending to a logging div. If I trigger events that would log to this 
div, I can see the text after the fact, but it doesn't get read as the 
text is appended.
So why is the previously-linked app performing nicely while my own 
isn't? The only difference I can think of is that my log events are 
triggered by a button press and aren't arriving over time, but I can't 
think of how that might matter.
Thanks.

--
Nolan Darilek
http://thewordnerd.info