• A file or code snippet containing styling instructions. A style sheet represents a form of separation of presentation and content for web design in which the markup of a web page (usually HTML) contains the page’s semantic structure as well as the content, but does not define its visual layout (styling). Instead, that styling 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. ← Wikipedia

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