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W3C CSS Activities

CSS defines HOW HTML elements are to be displayed.

CSS Tutorial

To learn more about CSS, read our CSS tutorial.

CSS1

CSS1 became a W3C Recommendation 17. December 1996.

W3C considers the CSS1 specification to be obsolete.

CSS1 is now defined as the CSS1 features (properties, values, at-rules, etc), using the syntax and definitions of CSS2.1

The CSS Style Attributes specification defines the CSS1 element-specific style attributes.

CSS2

CSS2 became a W3C Recommendation 12. May 1998.

CSS2 added support for media (printers and aural devices), downloadable fonts, element-positioning, and tables.

CSS2 is technically a W3C Recommendation. But since implementation brought to light many problems, instead of expanding CSS2, CSS Level 2 Revision 1 (CSS2.1) was defined.

In case of any conflict between the two specs, CSS2.1 contains the definitive definition.

The CSS Style Attributes specification defines the CSS2.1 element-specific style attributes.

CSS3

CSS3 is about breaking CSS into smaller modules.

CSS3 builds on CSS2, module by module, using the CSS2.1 specification as the core.

Each module adds functionality and/or replaces part of the CSS2.1 specification.

CSS4

From CSS3, modules will be defined independently: for example CSS4 Selectors may be defined before the CSS3 Line Module.

CSS Profiles

Not all CSS implementations will implement all functionality. For example, an implementation may choose to implement only the functionality required by a specified CSS Profile.

Profiles define a subset of CSS selectors/functions considered fundamental for a specific media/device. The W3C defines the following CSS profiles:

  • The Print Profile
  • The Mobile Profile
  • The TV Profile

W3C CSS Specifications and Timeline

Specification Draft / Proposal Recommendation
CSS 1   17. Dec 1996
CSS 1 (Revised)   11. Apr 2008
CSS 2   12. May 1998
CSS 2.1   07. Jun 2011
DOM Level 2 Style Specification   13. Nov 2000
CSS Style Attributes 12. Oct 2010  
CSS 3 Namespaces Module   29. Sep 2011
CSS 3 Selectors   29. Sep 2011
CSS 3 User Interface Module 17. Jan 2012  
CSS 3 Fonts Module 12. Feb 2013  
CSS 3 Color Module   07. Jun 2011
CSS 3 Backgrounds and Borders Module 24. Jul 2012  
CSS 3 Text Module 13. Nov 2012  
CSS 3 Lists and Counters Module 24. May 2011  
CSS 3 Line Module 15. May 2002  
CSS 3 Basic Box model 09. Aug 2007  
CSS 3 Multi-column Layout Module 12. Apr 2011  
CSS 3 Ruby Module 30. Jun 2011  
CSS 3 Speech Module 20. Mar 2012  
CSS 3 Paged Media Module 10. Oct 2006  
CSS 3 Generated content for Paged Media Module 29. Nov 2011  
CSS 3 Values and Units Module 28. Aug 2012  
CSS 3 Cascading and Inheritance 03. Jan 2013  
CSS 3 Template Layout Module 29. Nov 2011  
CSS 3 Media Queries   19. Jun 2012
     
CSS Mobile Profile 2.0 10. Dec 2008  
CSS TV Profile 1.0 14. May 2003  
CSS Print Profile 1.0 13. Oct 2006  

W3C Reference:

W3C CSS Home Page


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