Cascading Style Sheets, most of the time abbreviated as CSS, is a stylesheet language used to describe the presentation of a document written in HTML or XML (including various XML languages like SVG or XHTML). CSS describes how the structured element must be rendered on screen, on paper, in speech, or on other media.

CSS is one of the core languages of the open web and has a standardized W3C specification. Developed in levels, CSS1 is now obsolete, CSS2.1 is a recommendation, and CSS3, now split into smaller modules, is progressing on the standardization track.

  • CSS Reference

    An exhaustive reference for seasoned Web developers describing every property and concept of CSS.

  • CSS Tutorial

    A step-by-step introduction to help complete beginners get started. It presents all the needed fundamentals.

  • CSS3 Demos

    A collection of demos showing the latest CSS technologies in action: a boost for the creativity.

Documentation and tutorials

CSS key concepts
Describes the syntax and forms of the language and introduces fundamentals like specificity and inheritance, the box model and margin collapsing, stacking and block-formatting contexts, or the initial, computed, used and actual values. Entities like CSS shorthand properties are also defined.
CSS developer guide
Articles to help you learn everything from the basics of styling HTML with CSS to assorted CSS techniques to make your content shine.
Common CSS questions
Answers to common questions about CSS.

Tools for CSS development

See also

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