Chapter 3. Structure and the Cascade


Chapter 2 showed how document structure and CSS selectors allow you to apply a wide variety of styles to elements. Knowing that every valid document generates a structural tree, you can create selectors that target elements based on their ancestors, attributes, sibling elements, and more. The structural tree is what allows selectors to function and is also central to a similarly crucial aspect of CSS: inheritance.

Inheritance is the mechanism by which some property values are passed on from an element to its descendants. In determining which values should apply to an element, a user agent must consider not only inheritance but also the specificity of the declarations, as well as the origin of the declarations themselves. This process of consideration is what's known as the cascade. We will explore the interrelation between these three mechanisms specificity, inheritance, and the cascade in this chapter.

Above all, regardless of how abstract things may seem, keep going! Your perseverance will be rewarded.



Cascading Style Sheets
Beginning CSS: Cascading Style Sheets for Web Design (Wrox Beginning Guides)
ISBN: 0470096977
EAN: 2147483647
Year: 2003
Pages: 135
Authors: Richard York

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