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Cascading Style Sheet. An open standard developed by the World Wide Web Consortium which allows designers to describe how documents are presented on screen. The rules defined in a style sheet are read in sequence, cascading like a waterfall from the top down (first to last). The rules can define the size, style and color of fonts or the physical location of elements on the screen. The use of a style sheet allows the style (look and feel) of a page to be separated from the content (what it says) and the markup (how the page is structured).