I'm trying to understand the difference between the "deeper" and "parent" class names applied to parent li elements in a default Joomla 2.5 menu. They always seem to be applied together? It is always "deeper parent", never one or the other as far as I can see?
.deeper is applied when the menu item has a submenu (item)
.parent is applied if this menu item is parent of another menu item
If you have a menu showing all levels then both classes are applied to a parent menu item. But sometimes you want to show just the first level in your main menu and show the other levels in a side menu, for example. .deeper is then not applied on the main menu because it has only 1 level.
This edited screenshot should help understanding the classes better: