Cascading Style Sheets

Also known as Cascading Style Sheet

Cascading Style Sheets (CSS) is a style sheet language used for specifying the presentation and styling of a document written in a markup language, such as HTML or XML (including XML dialects such as SVG, MathML, or XHTML). CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.

AI overview

Cascading Style Sheets (CSS) is a language that controls how websites look by specifying colors, fonts, spacing, and other visual styling for documents written in HTML or similar markup languages. It's one of the three fundamental technologies that make the modern web work, alongside HTML (which provides the content and structure) and JavaScript (which adds interactive behavior).

AI-generated from the Wikipedia summary — may contain errors.

Key facts

File format.name: Cascading Style Sheets (CSS)
File format.extension: .css
File format.icon: Official CSS Logo.svg
File format.icon_size: 120px
File format.iconcaption: Official logo
File format.screenshot: Пример кода на CSS.jpg
File format.screenshot_size: 160px
File format.caption: Example of CSS source code
File format.mime: text/css
File format.uniform type: public.css
File format.developer: World Wide Web Consortium (W3C)
File format.genre: Style sheet language

~45 min read

Article

57 sections

Contents

Syntax
Style sheet
Selector
Selector types
Pseudo-classes
Combinators
Summary of selector syntax
Declaration block
Declaration
Properties
Values
Use
Sources
Multiple style sheets
Cascading
CSS priority scheme
Specificity
Examples
Inheritance
Example
Whitespace
Indentation
Positioning
Position property
Static
Relative
Absolute
Fixed
Float and clear
History
Difficulty with adoption
Vendor prefixes
CSS 1
CSS 2
CSS 2.1
CSS 3
CSS 4
Browser support
Limitations
Cannot explicitly declare new scope independently of position
Pseudo-class dynamic behavior not controllable
Cannot name rules
Cannot include styles from a rule into another rule
Cannot target specific text without altering markup
Advantages
Separation of content from presentation
Site-wide consistency
Bandwidth
Page reformatting
Accessibility
Standardization
Frameworks
Design methodologies
See also
References
Further reading
External links

CSS is designed to enable the separation of content and presentation, including layout, colors, and fonts. This separation can improve content accessibility, since the content can be written without concern for its presentation; provide more flexibility and control in the specification of presentation characteristics; enable multiple web pages to share formatting by specifying the relevant CSS in a separate .css file, which reduces complexity and repetition in the structural content; and enable the .css file to be cached to improve the page load speed between the pages that share the file and its formatting.