Automatic Numbering With CSS Counters
http://dev.opera.com/articles/view/automatic-numbering-with-css-counters/

Storey, David
Opera
2008

Abstract:

When writing documents, it is often useful to number sections and have a table of contents. You can number these by hand, directly in the markup, but this can be time consuming if the order changes and you have to edit all the numbers. CSS2.1 gives us a automated way to generate numbers using CSS counters, and this article will walk you through how to use them.