Even though tablist is a single selection scenario, it has special processing rules for setting states when a tab panel has focus:

"In the single selection case, it is not always necessary to manage selection events and states separate from focus, since selection mirrors focus. One exception is for tablist. In the case of a tab, if either the tab or its associated tabpanel has focus, then the tab is considered to be SELECTED. To implement this, the user agent can walk up the parent chain from the focus until it finds a tabpanel, then traverse the aria-labelledby relation from the tabpanel to the related tab, and mark the found tab as focused."

In the meeting on July 21, we looked through all of the roles to see if there are any other exceptions. Spinbutton looked like a possibility because the buttons might have focus but one of the options is selected. 

David, 

Determine if there are any special processing rules we need to describe for spinbuttons similear to what we have above for tablist.