Cascading Style Sheets

Cascading Style Sheets (CSS) is a Web styling format.

CSS is an important technology in the modern Web, where many characteristics of the presentation of a site are specified including fonts, colors, and special effects. Some of these things were formerly done using now-deprecated HTML elements and attributes such as the "font" element.

Page layout can also be specified using CSS, replacing older techniques of using tables for layout, but some developers still find tables easier to learn than CSS layout.

Official specs

 * W3C CSS home page
 * CSS1
 * CSS2 Revision 1
 * CSS Snapshot 2017

Other references

 * Cascading Style Sheets (Wikipedia)
 * CSS Reference
 * CSS Naked Day (webmasters were urged to make their sites CSS-free for one day)
 * 12 Awesome CSS3 Features That You Can Finally Start Using
 * Cargo Cult CSS
 * Does your browser's CSS implementation support the color 'rebeccapurple'? (More info)
 * What CSS to prefix?
 * Towards a Taxonomy of Errors in HTML and CSS
 * Flexbox Froggy: Help Froggy and friends by writing CSS code