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This CSS Reference shows the basic syntax of a CSS rule; lists all standard CSS properties, pseudo-classes and pseudo-elements, @-rules, units, and selectors, all together in alphabetical order, as well as just the selectors by type; and allows you to quickly access detailed information for each of them. It not only lists the CSS 1 and CSS 2.1 properties, but also is a CSS3 reference that links to any CSS3 property and concept standardized, or already stabilized.  Also included is a brief DOM-CSS / CSSOM reference.

Note that CSS rule-definitions are entirely (ASCII) text-based, whereas DOM-CSS / CSSOM, the rule-management system, is object-based.

See also Mozilla CSS Extensions for Gecko-specific properties prefixed with -moz; and WebKit CSS Extensions for WebKit-specific properties. See Vendor-prefixed CSS Property Overview by Peter Beverloo for all prefixed properties.

Basic rule syntax

Be warned that any syntax error in a rule definition will invalidate the entire rule.

Style rules

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

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

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

Examples

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

More about examples: #1, #2

@rules

As these have so many different structure-formats, see the desired At-rule for syntax.

Keyword index

ABCDEFGHIJKLMNOPQRSTUVWZOthers

Selectors

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

CSS3 Tutorials

These small how-to pages describe new technologies appeared in CSS3, or in CSS2.1 but with low support until recently:

Concepts

DOM-CSS / CSSOM

Major object types:

Important methods: