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Chapter 2. CSS > A Word About Cascading

A Word About Cascading

A fundamental feature of CSS is that more than one style sheet can influence a document’s presentation. This feature is known as cascading because the different style sheets are thought of as coming in a series. Cascading is a fundamental feature of CSS, because we realized that any single document could likely end up with style sheets from multiple sources: the browser, the designer, and possibly, the user.

In the last set of examples, you saw that the text color of the links turned blue without the style sheet specifying it. Also, the browser knew how to format BLOCKQUOTE and H1 elements without being told so explicitly. Everything that the browser knows about formatting is stored in the browser’s default style sheet and is merged with author and user style sheets when the document is displayed.


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