Don't CSS your XML

CSS should not be used to present homemade XML as web pages. You end up with nothing but style. Neither man nor machine can understand the structure of your document. CSS should only be used for widely supported XML applications like XHTML.

Tverskov, Jesper. Smack the Mouse (2004). Design>Web Design>CSS>XML

XML Transformations with CSS and DOM

Mozilla permits XML to be rendered in the browser with CSS, and manipulated with the DOM. This is a real boon to those of us eager to experiment with XML transformations (both visual and structural) without having to delve into unfamiliar technologies such as XPath, the verbose traversal language of XSLT. If you’re already familiar with CSS and DOM, you’re more than halfway to achieving XML transformations in Mozilla.

Apple Inc. (2006). Design>Web Design>XML>CSS