The CSS Working Group invites implementations of CSS Writing Modes Level 4 Candidate Recommendation and an updated Candidate Recommendation of CSS Writing Modes Level 3. These documents define CSS support for various international writing modes, such as left-to-right (e.g. Latin or Indic), right-to-left (e.g. Hebrew or Arabic), bidirectional (e.g. mixed Latin and Arabic) and vertical (e.g. Asian scripts). Level 4 is identical to Level 3, except that it contains the previously at-risk features which were dropped from Level 3 and an additional set of changes to more precisely define the box model’s interaction with bidi.
CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, in speech, etc.