Testing agains the dialog branch here: https://github.com/jquery/jquery-ui/pull/794
"Another problem reported is that focus does not appear to return to the element that triggered the dialog when the dialog is dismissed." - this is fixed. We now have code in place that restores focus to the opener.
1. Looking at the default demo, this seems like it got worse. JAWS switches to application mode but unlike the modal demos, doesn't let me use cursor keys to read text elements.
2. This is still not the case and by design. If there's nothing inside the dialog's content to focus, the dialog itself is focused. The user can then tab to the close button.
3. Related to the issue with the first item. Need to figure out what to do here. Since we do the focus-trapping for both modal and non-modal dialogs, we probably want the sandboxing for non-modals as well.