Selectors, Specificity, and the Cascade

Exactly how does the "cascade" in Cascading Style Sheets work? This concise guide demonstrates the power and simplicity of CSS selectors for applying style rules to different web page elements. You’ll learn how your page’s presentation depends on a multitude of style rules and the complex ways they function—and sometimes collide—within the document’s structure. This guide is an excerpt from the upcoming fourth edition of CSS: The Definitive Guide.