w3c

CSS Working Group Editor Drafts

Service Workers

Intersection Observer

Deliverables of the HTML Working Group until October 2018

The conformance checker for EPUB publications

Web Content Accessibility Guidelines

Web Authentication: An API for accessing Public Key Credentials

WAI-ARIA Authoring Practices Guide (APG)

WebCodecs is a flexible web API for encoding and decoding audio and video.

WebTransport is a web API for flexible data transport

A Well-Known URL for Changing Passwords

Requirements for Chinese Text Layout

SVG Working Group specifications

Accessible Rich Internet Applications (WAI-ARIA)

Manifest for web apps

Charter and administrivia for the WebExtensions Community Group (WECG)

Remote control interface that enables introspection and control of user agents.

Web Application Security Working Group repo

A browser API to prevent DOM-Based Cross Site Scripting in modern web applications.

Web中文兴趣组

Bidirectional WebDriver protocol for browser automation

Trace Context

Payment Request API

Device Bound Session Credentials: A Protocol for Protecting From Cookie Theft

Machine-readable references of terms defined in web browser specifications

WebRTC 1.0 API

W3C Decentralized Identifier Specification

A mechanism to selectively enable and disable browser features and APIs

W3C Web Performance Working Group repo

Shared workspace for EPUB 3 specifications.

The MiniApps Working Group was closed on 26 August 2026. Please continue these discussions within the WebView Community Group https://www.w3.org/community/webview/.

W3C Verifiable Credentials v2.0 Specification

Web API proposal for sharing data from a web page

A machine-readable list of Web specifications

The Mobile Checker is a tool for Web developers who want to make their Web page or Web app work better on mobile devices.

Picture-in-Picture (PiP)

Activity Streams 2.0

The W3C API

The W3C Web Cryptography API

WebSub Spec in Social Web Working Group

Media Source Extensions

Making RDF easy enough for most developers

WebIDL parser

W3C Website feedback and bug reports

Bullet Chatting Proposal

Indexed Database API

Paint Timing

W3C Process Document

The document repo for the Web Payments Working Group

W3C CSS Validation Service

Global Privacy Control Specification

Web of Things

WebAppSec Content Security Policy

Specs and explainers maintained by the editing task force

Framework for Web technology roadmaps

ARIA in HTML

Accessibility Guidelines "Silver"

Encrypted Media Extensions

Web API proposal for receiving shared data

WCAG 3

team-strat, on GitHub, working in public.

Interface to create and manage QUIC streams

Dataset Exchange Working Group

Data Shapes WG repo

Documents produced by the CSV on the Web Working Group

Repository for the Spatial Data on the Web Working Group

Libwww is a highly modular, general-purpose client side Web API written in C for Unix and Windows (Win32). It's well suited for both small and large applications, like browser/editors, robots,...

WebVTT parser and validator

UI Events

Push API

Web Annotation Working Group repository, see README for links to specs

Gamepad

Clipboard API and events

This repository hosts the W3C WAI web site.

Web of Things (WoT) Thing Description

W3C Automotive Working Group Specifications

Decentralized Identifier Ecosystem Extensions

w3c.github.io

Check links and anchors in Web pages or full Web sites.

Repository used during WCAG 2.1 development. New issues, Technique ideas, and comments should be filed at the WCAG repository at https://github.com/w3c/wcag.

Secure Payment Confirmation (SPC)

Text Layout Requirements for Japanese

Media Session API

JSON-LD 1.1 Specification

Elements of HTML per version

Resource Timing

W3C-customized version of the feedvalidator (forked from https://github.com/rubys/feedvalidator/)

An HTTP API for performing verifiable credential lifecycle management.

WebRTC Statistics

Generic Sensor API

WebRTC Encoded Transform

Media Capture and Streams specification (aka getUserMedia)

Unicorn - W3C's Unified Validator

Cross-tab resource coordination API

Maintenance of the PNG specification

Webmention spec