CSS is an Abbreviation
It stands for Cascading Style Sheet.
Style sheet refers to the document itself. Style sheets have been used for document design for years. They are the technical specifications for a layout, whether print or online. Print designers use style sheets to insure that their designs are printed exactly to specifications. A style sheet for a Web page serves the same purpose, but with the added functionality of also telling the viewing engine (the Web browser) how to render the document being viewed.
Cascade is the special part. A Web style sheet is intended to cascade through a series of style sheets, like a river over a waterfall. The water in the river hits all the rocks in the waterfall, but only the ones at the bottom affect exactly where the water will flow.
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