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Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a web page. While the W3C CSS Working Group has produced dozens of CSS-related specifications (whose most recent version is CSS 4), CSS 2.1 is (after over a dozen years of drafts) still the only entirely reliable basis for styling web pages.

From the CSS 2.1 Recommendation:

Example#

A CSS stylesheet is a text (human-readable) document composed from one or more CSS rules. A CSS rule is at its most basic rather simple, composed of a selector and one or more assigned style properties. For example, the following rule styles all HTML paragraphs with a 'class' attribute containing the value "hilight" (i.e., "<p class='hilight'>Outside of a dog...</p>") to having a left margin of 16 pixels and a 'MidnightBlue' font color. Colors in HTML can be specified various ways, either as HTML Colour Names such as "MidnightBlue", RGB ("rgb(25,25,112)") or hexadecimal ("#191970") values. Because only a few color names are reliably supported by all browsers it is safer to use an RGB or hexadecimal value.

p.hilight { margin-left: 16px ; color : #191970 }

where the selector is "p.hilight", the assigned properties of "margin-left: 16px" and "color : #191970".

JSPWiki permits direct input of CSS styles using wiki markup. The above example can be accomplished directly on a wiki page using the following markup:

%%(margin-left: 16px ; color : #191970)
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read. — Groucho Marx
%%

This would appear as:

Specifications#

• Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification, W3C Recommendation 07 June 2011