AX is not exposing elements inside a <legend>, so that if a control element like a link is in the legend, the user cannot get to it ie) <legend>Not link <a href="http://www.apple.com">Link</a></legend> <rdar://problem/18051714>
Created attachment 237933 [details] patch
http://trac.webkit.org/changeset/173515
Note this was a regression from the well-intentioned https://bugs.webkit.org/show_bug.cgi?id=122534