Pure CSS Tool Tips Revisited

The article gives no indication of why one would implement all this complicated CSS just to duplicate the effect of the "title" attribute. After all, tooltips are already a built-in function of every browser, and users are familiar with how they work. How is this any better than those annoying sites that re-implement scrollbars or the back button in awkward, unfamiliar ways?

I'm using css-only tooltips on various parts of my blog. Here's the code: http://blog.sachleen.com/css-only-tooltips.html

It meets all of the requirements discussed in this post and uses much less CSS.