Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A style sheet language or style language, is a computer language used to describe the presentation of structured documents. A structured document which doesn't break the schema it is designed to conform to is "well-formed". A program processing the document must model the schema, and can present it in different formats, fonts, and order, as well as with other effects, by using different sets of style rules contained in different style sheets. One modern style sheet language with widespread use is Cascading Style Sheets, which is used to style documents written in HTML, XHTML, SVG, XUL, and other markup languages. One of the most attractive features of structured documents is that the content can be reused in many contexts and presented in various ways. Different style sheets can be attached to the logical structure to produce different presentations.

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