Cascading vogue Sheets (CSS3) may be a piece of paper language used for describing the presentation of a document written in a very terminology.[1] though most frequently accustomed set the visual sort of websites and user interfaces written in HTML and XHTML, the language is applied to any XML document, together with plain XML, SVG and XUL, and is applicable to rendering in speech, or on different media. along side HTML and JavaScript, CSS may be a cornerstone technology utilized by most websites to form visually participating webpages, user interfaces for net applications, and user interfaces for several mobile applications.

CSS is intended primarily to modify the separation of document content from document presentation, together with aspects like the layout, colors, and fonts. This separation will improve content accessibility, offer a lot of flexibility and management within the specification of presentation characteristics, modify multiple HTML pages to share data format by specifying the relevant CSS in a very separate .css file, and scale back complexness and repetition within the structural content.

Separation of data format and content makes it potential to gift a similar markup page in several designs for various rendering strategies, like on-screen, in print, by voice (via speech-based browser or screen reader), and on Braille-based tactile devices. It also can show the net page otherwise counting on the screen size or viewing device. Readers also can specify a special piece of paper, like a CSS file hold on on their own pc, to override the one the author such.

"The W3C operates a free CSS validation service for CSS documents."