The suggestions shown under the search field are not accessible via the screen reader. It's not announced, and it does not get read. Ideally, when a term is entered, the screen reader should announce that a list of suggestions is available, and give the user some hint as to how to navigate there (down-arrow works, tab closes the suggestion box and moves the focus away from the search field).
This report results from feedback from the German Central Library for the Blind
(DZB). Please see
http://www.mediawiki.org/wiki/Accessibility#Feedback_from_the_DZB.2C_July_2010
for some background.
Version: 1.22.0
Severity: minor