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A web style sheet is a form of separation of presentation and content for web design in which the markup of a webpage contains the page's semantic content and structure, but does not define its visual layout. Instead, the style is defined in an external style sheet file using a style sheet language such as CSS or XSLT. This design approach is identified as a "separation" because it largely supersedes the antecedent methodology in which a page's markup defined both style and structure.
The philosophy underlying this methodology is a specific case of separation of concerns.
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