Because CSS is rendered by following a bottom-up parse, the most efficient coding targets the most specific element first (and by first, we mean the furthest-right selector).

Editor’s note: This How To assumes a basic understanding of HTML. Along with HTML and JavaScript, CSS forms the foundation of the open Web. These three technologies power just about every ...

The W3C’s CSS working group, which oversees CSS 3, is even moving toward making any() an official draft spec. Once that happens the rest of the browser pack will likely add support as well.