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Cascading down Style Sheets (CSS) is really a style sheet language employed for explaining the presentation semantics of the document designed in a markup language. Its most typical application would be to style WebPages designed in HTML and XHTML, however the language may also be put on any type of XML document, including plain XML, SVG and XUL.

CSS was created mainly to allow the separation of document content from document presentation, including elements like the layout, colors, and fonts. This separation can improve content ease of access, provide more versatility and control within the specs of presentation qualities, enable multiple pages to talk about formatting, and lower complexity and repetition within the structural content. CSS may also permit the same markup page to become presented in various styles for various rendering techniques, for example on-screen, in publications, by voice as well as on Braille-based, tactile products. It is also accustomed to allow the site to show in a different way with respect to the display size or device which it's being seen. As the writer of a document typically links that document to some CSS style sheet, visitors may use another style sheet, possibly one by themselves computer, to override the main one the writer has specified.

CSS identifies important plan to find out which style rules apply if several rule matches against a specific element. Within this so-known as cascade, focal points or weights are calculated and designated to rules, to ensure that the outcomes are foreseeable.

The CSS specifications are maintained by the internet Consortium. Internet media type text/css is registered to be used with CSS by RFC 2318, and in addition they manage a free CSS validation service.