The CSS Working Group invites implementations of an updated Candidate Recommendation of CSS Writing Modes Level 3. This document defines 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).
Along with this updated Candidate Recommendation, the group also published a First Public Working Draft of CSS Writing Modes Level 4. The difference from the CSS Writing Modes Level 3 is the set of features that were deferred from Level 3 due to later implementation uptake.
CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, in speech, etc.