What is "css3"

The latest evolution of CSS is being called CSS3, and has incorporated new properties and selectors into the language.

After the Level 2.1 of the CSS specification , W3C subdivided CSS works into different modules, with independent development. Some of the modules:

• Selectors
• Media Queries
• Flexible Box

References

• Using CSS features and selectors for content formatting - .Net Magazine 79

• W3C Official Documentation on CSS3

https://www.w3.org/TR/2001/WD-css3-roadmap-20010523/

• Current status of W3C development of the CSS standard

https://www.w3.org/standards/techs/css#w3c_all

• Official news about CSS development on the W3C blog

https://www.w3.org/blog/CSS/

Image source: http://www.jasonspeaking.com/indexphp/2010/04/the_evolution_of_html_css/