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CSS

A cascading style sheet (CSS) is a Web page derived from multiple sources with a defined order of precedence where the definitions of any style element conflict. The Cascading Style Sheet, level 1 (CSS1) recommendation from the World Wide Web Consortium (W3C), which is implemented in the latest versions of the Netscape and Microsoft Web browsers, specifies the possible style sheets or statements that may determine how a given element is presented in a Web page.

Cascading Style Sheets (CSS) is a standard (or language) that describes the formatting of markup language pages. CSS defines formatting for the following document types:

  • HyperText Markup Language (HTML)
  • Extensible HyperText Markup Language (XHTML)
  • Extensible Markup Language (XML)
  • Scalable Vector Graphic (SVG)
  • XML User Interface Language (XUL)

CSS enables developers to separate content and visual elements for greater page control and flexibility. A CSS file is normally attached to an HTML file by means of a link in the HTML file.

Cascading Style Sheets Level1(CSS1)

Cascading Style Sheets, level 1 (CSS1) is a recommendation prepared by the World Wide Web Consortium (W3C) that defined the first version (level) of CSS.

CSS defines the concept of style where style defines appearance. Each and every tag of HTML can be modified by associating a particular style with it. The concept of style optimizes the performance of HTML content rendering, and simplifies developers' work by uniformly rendering a style specification across different browser implementations. CSS consists of selectors and declarations. The declaration is a combination of property and value.

Cascading Style Sheet Level2(CSS2)

Cascading Style Sheets Level 2 (CSS2) is the second version of cascading style sheets developed by W3C. It's a declarative language used to enhance the hyperextensive text markup language. CSS2 is a subset of Cascading Style Sheets Level 1 and has enhanced capabilities like:

  • Media types concept
  • Aural style sheets
  • Features for internationalization
  • Extended font selection
  • Automatic numbering and generated content
  • Cursors
  • Dynamic outlines
  • Capability to control content overflow, clipping
  • Absolute, fixed and relative positioning
  • Extended selector mechanism