Cascading Style Sheets

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Cascading Style Sheets (CSS) is a language used to define the presentation ("look and feel") of a document written in HTML or some other markup language.

Style sheet

See Style sheet (web design) for a discussion of style sheets.

Web page layout

CSS is fundamental to web page layout.

CSS box model

The CSS box model defines how HTML elements fills space in a web page.

Separation of concerns

Separation of concerns is a design principle which requires certain entities to take certain responsibilities, and other entities to take other responsibilities.

In web design, separations of concerns includes the separation of:

  • Style sheet provide design, presentation, layout, color
  • Markup tags (HTML or XHTML) provides semantic content and structure

This design approach is identified as a "separation" because it largely supersedes the antecedent methodology in which a page's markup (HTML) defined both style and structure. (For example, the font element.)

Selectors

Selectors specify which HTML elements will be selected -- and thus affected -- by a style rule.

Fundamental selectors

See also

External links