CSS reference

Use this CSS reference to browse an alphabetical index of all the standard CSS properties, pseudo-classes, pseudo-elements, data types, and at-rules. You can also browse a list of all the CSS selectors organized by type and a list of key CSS concepts. Also included is a brief DOM-CSS / CSSOM reference.

Basic rule syntax

Style rule syntax

selectorlist {
  property: value;
  [more property:value; pairs]
}

... where selectorlist is: selector[:pseudo-class] [::pseudo-element] [, more selectorlists]

See selector, pseudo-class, pseudo-element lists below.

Style rule examples

strong {
  color: red;
}

div.menu-bar li:hover > ul {
  display: block;
}

For a beginner-level introduction to the syntax of CSS selectors, please see this tutorial. Be aware that any CSS syntax error in a rule definition invalidates the entire rule. Invalid rules are ignored by the browser. Note that CSS rule definitions are entirely (ASCII) text-based, whereas DOM-CSS / CSSOM (the rule management system) is object-based.

At-rule syntax

As the structure of at-rules varies widely, please see At-rule to find the syntax of the specific one you want.

Keyword index

The property names in this index do not include the JavaScript names where they differ from the CSS standard names.

ABCDEFGHIJKLMNOPQRSTUVWZOthers

Selectors

Basic selectors

Combinators

Pseudo-classes

Pseudo-elements

See also: A complete list of selectors in the Selectors Level 3 specification.

Concepts

Syntax and semantics

Values

Layout

DOM-CSS / CSSOM

Major object types

Important methods

See also