The CSS Working Group invites implementations of two updated Candidate Recommendations of CSS Cascading and Inheritance Level 3 and CSS Cascading and Inheritance Level 4. The CSS module defined in these documents describes how to collate style rules and assign values to all properties on all elements. By way of cascading and inheritance, values are propagated for all properties on all elements. New in the Level 4 are the ‘revert’ keyword and <supports-condition> for the ‘@import’ rule.
CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, in speech, etc.