You’ve heard style sheets mentioned quite a bit already, and now we’ll finally put them to work and start giving our pages some much needed style. Cascading Style Sheets (CSS) is the W3C standard for defining the presentation of documents written in HTML, and in fact, any XML language. Presentation, again, refers to the way the document is displayed or delivered to the user, whether on a computer screen, a cell phone display, printed on paper, or read aloud by a screen reader. With style sheets handling the presentation, HTML can handle the business of defining document structure and meaning, as intended.