The Cascading Style Sheets (CSS) Working Group has published a Working Draft of CSS Ruby Layout Module Level 1. “Ruby”, a form of interlinear annotation, are short runs of text alongside the base text. They are typically used in East Asian documents to indicate pronunciation, or to provide a short annotation. This module describes the rendering model and formatting controls related to displaying ruby annotations in CSS. CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, in speech, etc. Learn more about the Style Activity.