The  CSS Working Group  invites implementations of a Candidate Recommendation of  CSS Painting API Level 1 , an API for allowing web developers to define a custom CSS  <image>  with javascript, which will respond to style and size changes. See  EXPLAINER .

The  Timed Text Working Group  invites implementations of an updated Candidate Recommendation of  Timed Text Markup Language 1 (TTML1) (Third Edition) . This document specifies Timed Text Markup Language (TTML), Version 1, also known as TTML1, in terms of a vocabulary and semantics thereof. The Timed Text Markup Language is a content type that represents timed text media for the purpose of interchange among authoring systems. Timed text is textual information that is intrinsically or extrinsically associated with timing information. It is intended to be used for the purpose of transcoding or exchanging timed text information among legacy distribution content formats presently in use for subtitling and captioning functions. In addition to being used for interchange among legacy distribution content formats, TTML Content may be used directly as a distribution format, for example, providing a standard content format to reference from a  <track>  eleme...

W3C has published a new version of its  Roadmap of Web Applications on Mobile , an overview of the various technologies developed in W3C that increase the capabilities of Web applications, and how they apply more specifically to the mobile context. The contents of the roadmap have been updated to follow the evolution of the Web platform since April 2018. See the  Change history  for details. Most of these updates focused on mechanisms that allow mobile web applications to tweak performance settings and gain finer-grained control over the browser’s default behavior. In particular, new exploratory work and technologies in progress mentioned in the  Performance and Tuning page include: the CSS Animation Worklet API to create scripted animations in a dedicated thread, the CSS  contain  property to indicate that an element’s subtree is independent of the rest of the page, the proposed CSS  overscroll-behavior  property to control the behavior o...