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2.5. Structure

As I've mentioned before, CSS is powerful because of the way in which it uses the structure of HTML documents to determine which styles should be applied in what ways. That's really only a part of the story, though, since it implies that the only way CSS uses document structure is to determine which rules apply to which elements.

The truth is that structure plays a much bigger role in the way styles are applied to a document. In order to understand this role, we need to understand how documents are structured. Take the "tree" view in Figure 2-18 of the simple HTML document listed here:


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