To fulfill accessibility requirements in HTML5 output we need to highlight a menu item, when a user browses through the side navigation by the tab key. In the Side Navigation Skin you can specify a "Search Result Link (focus)" style which achieves what we need for search results but there is no such focus style for a "Side Navigation Menu Item".
Is there an easy way to set up such a style, e.g. by any kind of direct CSS tweaking?