When you need to present data in a chart on a web page, it is often worthwhile to generate graphical charts. This method is covered later in Section 18.4, "Creating a Graph/Chart Library"; however, sometimes for a quick chart CSS can suffice. Listing 9.4.1 presents a function that creates a visual chart of data using CSS and XHTML only.

You can find the code they're talking about for "Listing 9.4.1". They explain it briefly, but it's a quick "here's what it looks like" and less of a "here's the logic behind it" kind of post. Never the less, it's still quite useful.