IMSC Hypothetical Render Model is a W3C Proposed Recommendation

 Today the Timed Text Working Group published IMSC Hypothetical Render Model as a W3C Proposed Recommendation. This specification specifies an Hypothetical Render Model (HRM) that constrains the presentation complexity of documents that conform to the Text Profiles specified in any edition of Internet Media Subtitles and Captions ([IMSC]).

The model is not intended as a specification of the processing requirements for implementations. For instance, while the model defines glyph cache for the purpose of modelling how the number of glyph drawing operations can be reduced, it neither requires the implementation of such a cache, nor models the sub-pixel glyph positioning and anti-aliased glyph rendering that can be used to produce text output. Furthermore, the model is not intended to constrain readability complexity.

W3C Invites Implementations of DPub-ARIA 1.1 and DPub-AAM 1.1

The Accessible Rich Internet Applications Working Group invites implementations of the following Candidate Recommendation Snapshots:

• Digital Publishing WAI-ARIA Module 1.1: Enabling users of assistive technologies to find their way through web content requires embedding semantic metadata about web document structural divisions. This is particularly important for structural divisions of long-form documents and goes along with embedding semantic metadata about web-application widgets and behaviors for assistive technologies. This specification defines a set of WAI-ARIA roles specific to helping users of assistive technologies navigate through such long-form documents.
• Digital Publishing Accessibility API Mappings 1.1 defines how user agents map the Digital Publishing WAI-ARIA Module [dpub-aria-1.1] markup to platform accessibility APIs. It is intended for user agent developers responsible for accessibility in their user agent so that they can support the accessibility content produced for digital publishing.

Comments are welcome via GitHub issues by 27 April 2024.