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Chapter 9. Positioning > General Concepts

9.1. General Concepts

Before delving into the specific mechanisms of positioning, we need to establish a number of concepts. These concepts actually form the foundation of CSS layout in general since every displayed element can be described in terms of its positioning. After all, any element that is placed onscreen, or printed on a piece of paper, has a position and must therefore be positioned—by the user agent, if nothing else.

The containing block is the context in which formatting takes place. For example, the containing block of a boldface element could be the paragraph in which it occurs, as demonstrated in Figure 9-1.


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