Beispiel des Fairworx-Menüs. Border markiert abhängenden Aktiv-Zustand in Untermenüpunkt.
.menu-item.menu-item-type-post_type.menu-item-object-page.current-menu-ancestor.current-menu-parent.current_page_parent.current_page_ancestor.menu-item-has-children a, .menu-item:hover a{
border-bottom:3px solid #000;
}
.menu-item a{
border-bottom:3px solid #fff;
}