This page demonstrates a safe way of including pure CSS menu triggers, without them interfering with the javascript open and close timers. View this page WITH the javascript includes to see the difference in appearance and behavior.
Pure CSS menus need to be all the same width, so to improve the appearance when scripting is available, this demo also uses the Auto-sizing Menus extension.
They also impose a variety of other restrictions, and for these and other reasons, their use is generally discouraged. For more information please see: Adding pure CSS menus