The RDF Dataset Canonicalization and Hash Working Group has published a First Public Working Draft of RDF Dataset Canonicalization.This document describes an algorithm for canonicalizing RDF datasets, based on a final CG report from the Credentials Community Group. This provides a foundation for comparing the differences between RDF datasets, digitally signing them, or generating short identifiers for them via hashing algorithms.
The CSS Working Group has published a first public Draft Note of CSS Snapshot 2022. This document collects together into one definition all the specs that together form the current state of Cascading Style Sheets (CSS) as of 2022. The primary audience is CSS implementers, not CSS authors, as this definition includes modules by specification stability, not Web browser adoption rate.
CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, etc.
The Accessible Platform Architectures (APA) Research Questions Task Force (RQTF) welcomes feedback on the first public Draft Note of the Collaboration Tools Accessibility User Requirements. The purpose of this document is to outline various accessibility-related user needs, requirements and scenarios for collaboration tools. The solutions identified in this document are intended to influence the evolution of future accessibility guidelines, technical specifications, or features of collaboration tools and assistive technologies. They are relevant to software developers who contribute to any of these aspects of the collaborative experience. Please send comments by 30 December 2022.
The Accessible Rich Internet Applications Working Group invites implementations of the Candidate Recommendation Snapshot of Core Accessibility API Mappings 1.2. This document describes how user agents should expose semantics of web content languages to accessibility APIs. This helps users with disabilities to obtain and interact with information using assistive technologies. Documenting these mappings promotes interoperable exposure of roles, states, properties, and events implemented by accessibility APIs and helps to ensure that this information appears in a manner consistent with author intent.
The W3C Advisory Committee, having nominated seven individuals, is invited today to vote until 13 December 2022 for three seats in the W3C Technical Architecture Group (TAG) election.
The TAG is a special working group within the W3C, chartered under the W3C Process Document, with stewardship of the Web architecture. Some aspects of its mission include:
- to document and build consensus around principles of Web architecture and
to interpret and clarify these principles when necessary;
- to resolve issues involving general Web architecture brought to the
- to help coordinate cross-technology architecture developments inside and
The Verifiable Credentials Working Group has published a First Public Working Draft of the Verifiable Credential Data Integrity 1.0. This specification describes mechanisms for ensuring the authenticity and integrity of Verifiable Credentials and similar types of constrained digital documents using cryptography, especially through the use of digital signatures and related mathematical proofs.
The Immersive Web Working Group invites implementations of a new Candidate Recommendation of WebXR Augmented Reality Module – Level 1, which expands the WebXR Device API with the functionality available on AR hardware.
W3C is pleased to announce the report from the W3C Workshop on Wide Color Gamut and High Dynamic Range for the Web, held online in July-September 2021.
This report contains an executive summary, introduces the subject area, discusses major topics from the live sessions, links to the presentation videos and session minutes, and details next steps that were taken, and continue to be explored, after the workshop.
The workshop connected the color science, content creation and web platform communities and explored the current, ongoing transition of the web platform from the legacy sRGB, narrow gamut, standard dynamic range world of the previous quarter century, through wide color gamut, and onto high dynamic range.
15 workshop talks were published and discussed online in five live sessions. The main outcomes are that:
- Standardization efforts on WCG and HDR are in-place and ongoing at W3C, the International Color Consortium, the Alliance for Open Media, and other fora
- A Color API for the Web is currently being incubated in WICG, and when more mature will require formation of a new W3C Working Group
- Interoperability for WCG-aware Web specifications has been a focus for the last year, including Interop 2022
- Canvas has already been extended to WCG, and HDR in Canvas is at the prototype stage
- Handling of HDR content, in particular HDR tone mapping for a wide range of displays and viewing environments, needs significant further discussion and experimentation.
W3C thanks the Program Committee, workshop speakers, and all participants for making this event possible and for continuing to work together to explore the next steps in the year since the live sessions. Substantial progress has already been made. Join us in continuing this important effort.
The CSS Working Group has proposed corrections to the W3C Recommendation of CSS Containment Module Level 1. This CSS module describes the contain property, which indicates that the element’s subtree is independent of the rest of the page. This enables heavy optimizations by user agents when used well.
Proposed corrections are marked in the document. Comments, including implementation experience, are welcome via GitHub through 10 January 2023.
The PNG Working Group
has published a First Public Working Draft of the
Portable Network Graphics (PNG)
Specification (Third Edition).
Completely backwards compatible with the millions of PNG graphics conforming to
the older (2003) Second Edition, this new edition folds in reported errata and clarifications
and also adds some much-requested new features:
- Animated PNG, widely implemented for a decade but not part of the
official specification until now
- Coding-Independent Code Points, which clearly identify the color space
used by a graphic for improved rendering fidelity without blowing up the file size.
This includes support for High Dynamic Range (HDR)
color spaces such as BT.2100 HLG and PQ
- Support for EXIF metadata
The PNG Working Group will continue to refine the PNG specification, including
handling newly reported bugs,
tracking implementations, and
adding Web Platform Tests for the format.