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    • clreq

      Public
      Requirements for Chinese Text Layout
      i18nw3cchinese
      i18nw3cchinese
      HTML
      •
      Other
      •64•789•181•7•Updated Mar 17, 2026Mar 17, 2026

    • musicxml

      Public
      MusicXML specification
      XSLT
      •63•577•130•4•Updated Mar 17, 2026Mar 17, 2026

    • webref

      Public
      Machine-readable references of terms defined in web browser specifications
      cssidlweb-platform
      cssidlweb-platformdefinitions-data
      JavaScript
      •
      MIT License
      •118•415•52•3•Updated Mar 17, 2026Mar 17, 2026

    • wcag

      Public
      Web Content Accessibility Guidelines
      HTML
      •
      Other
      •373•1.4k•488•97•Updated Mar 17, 2026Mar 17, 2026

    • validate-repos

      Public
      Test whether W3C spec repos match a set of best practices
      JavaScript
      •
      Other
      •14•21•16•10•Updated Mar 17, 2026Mar 17, 2026

    • groups

      Public
      Complement to https://www.w3.org/groups/
      JavaScript
      •
      MIT License
      •3•9•1•0•Updated Mar 17, 2026Mar 17, 2026

    • csswg-wiki

      Public
      CSS Working Group Wiki – community-editable documentation
      csswikiw3c
      csswikiw3cw3css
      Markdown
      •10•4•0•1•Updated Mar 16, 2026Mar 16, 2026

    • user-timing

      Public
      User Timing
      Bikeshed
      •
      Other
      •14•28•9•1•Updated Mar 16, 2026Mar 16, 2026

    • securityig

      Public
      Security Interest Group
      Other
      •2•6•9•0•Updated Mar 16, 2026Mar 16, 2026

    • mediacapture-record

      Public
      MediaStream Recording
      webrtc
      webrtc
      Bikeshed
      •
      Other
      •23•112•29•1•Updated Mar 16, 2026Mar 16, 2026

    • csswg-drafts

      Public
      CSS Working Group Editor Drafts
      css
      css
      Bikeshed
      •
      Other
      •780•4.8k•4.3k•137•Updated Mar 16, 2026Mar 16, 2026

    • webvtt

      Public
      WebVTT Standard
      HTML
      •
      Other
      •33•117•102•12•Updated Mar 16, 2026Mar 16, 2026

    • webauthn

      Public
      Web Authentication: An API for accessing Public Key Credentials
      webauthn
      webauthn
      HTML
      •
      Other
      •265•1.4k•73•14•Updated Mar 16, 2026Mar 16, 2026

    • webdriver-bidi

      Public
      Bidirectional WebDriver protocol for browser automation
      Bikeshed
      •71•485•241•29•Updated Mar 16, 2026Mar 16, 2026

    • mathml-docs

      Public
      Notes and other documents by the Math WG. See also https://github.com/w3c/mathml-core (repo for the MathML Core spec) and https://github.com/w3c/mathml (repo fo…
      HTML
      •
      Other
      •9•7•8•1•Updated Mar 16, 2026Mar 16, 2026

    • html-aria

      Public
      ARIA in HTML
      HTML
      •
      Other
      •49•197•51•6•Updated Mar 16, 2026Mar 16, 2026

    • wcag-act-rules

      Public
      WCAG Conformance Test Rules
      HTML
      •
      Other
      •16•29•35•4•Updated Mar 16, 2026Mar 16, 2026

    • i18n-tests

      Public
      Internationalization tests run with the W3C i18n test suite.
      HTML
      •11•19•13•3•Updated Mar 16, 2026Mar 16, 2026

    • w3c-website-templates-bundle

      Public
      Symfony Bundle containing generic templates for W3C Website
      Twig
      •
      Other
      •14•78•0•5•Updated Mar 16, 2026Mar 16, 2026

    • mediasession

      Public
      Media Session API
      Bikeshed
      •
      Other
      •27•134•60•2•Updated Mar 16, 2026Mar 16, 2026

    • wcag3

      Public
      WCAG 3
      Astro
      •
      Other
      •32•130•354•8•Updated Mar 16, 2026Mar 16, 2026

    • ns

      Public
      W3C namespaces
      HTML
      •4•1•3•3•Updated Mar 16, 2026Mar 16, 2026

    • media-capabilities

      Public
      Media Capabilities API
      HTML
      •
      Other
      •32•78•27•4•Updated Mar 16, 2026Mar 16, 2026

    • wai-website

      Public
      This repository hosts the W3C WAI web site.
      accessibilityw3c
      accessibilityw3c
      HTML
      •
      Other
      •1.3k•117•349•55•Updated Mar 16, 2026Mar 16, 2026

    • specberus

      Public
      Checker used at W3C to validate the compliance of Technical Reports with publication rules
      HTML
      •
      MIT License
      •56•89•48•1•Updated Mar 16, 2026Mar 16, 2026

    • css-validator

      Public
      W3C CSS Validation Service
      Java
      •
      Other
      •115•234•58•8•Updated Mar 16, 2026Mar 16, 2026

    • wai-course-list

      Public
      List of Courses on Web Accessibility
      JavaScript
      •12•15•10•21•Updated Mar 16, 2026Mar 16, 2026

    • guide

      Public
      The Guidebook is the collected wisdom of the W3C Group Chairs, team contacts and other contributors.
      HTML
      •59•67•57•6•Updated Mar 16, 2026Mar 16, 2026

    • wot

      Public
      Web of Things
      HTML
      •134•230•27•5•Updated Mar 16, 2026Mar 16, 2026

    • reffy

      Public
      Reffy is a Web spec crawler and analyzer tool. It is notably used to update Webref
      JavaScript
      •
      MIT License
      •25•81•41•5•Updated Mar 16, 2026Mar 16, 2026