Last week I took a look at the coming css shapes module. It’s actually part of a more general module on css exclusions (formerly positioned floats) and I want to look at the more general exclusions today.
A few weeks ago Andrei raised an interesting question on one of my older posts. The post shows how to create a navigation bar. Andrei noticed the submenu was positioned absolutely, but none of its ancestor elements had positioning applied. Why then did the submenu display directly below its parent link in the menu?