# W3C

**Canonical:** https://apis.io/providers/w3c/  
**Website:** https://www.w3.org/  
**APIs profiled:** 15

The World Wide Web Consortium (W3C) is the main international standards body for the World Wide Web, founded by Tim Berners-Lee in 1994. W3C develops web standards and guidelines to ensure the long-term growth of the Web, focusing on accessibility, internationalization, privacy, and security. W3C specifications include HTML, CSS, XML, SVG, WebAssembly, ARIA, WCAG, JSON-LD, Verifiable Credentials, and hundreds of other foundational web technologies. W3C operates through Working Groups, Interest Groups, and Community Groups that develop specifications through a consensus-based process, resulting in W3C Recommendations.

## Kin Score — 24.8 / 100 (emerging)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.4 from 24.4).

| Facet | Score |
|---|---|
| Discoverability | 55.6 |
| Contract Quality | 54.4 |
| Governance | 28.8 |
| Contract Governance | 28.8 |
| Operational Transparency | 13.2 |
| Developer Ergonomics | 2.4 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 24.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | na |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (15)

- **W3C API** — The W3C API provides programmatic access to W3C data including specifications, working groups, editors, translations, and affiliations. It enables developers to query W3C's cata...
- **Web Content Accessibility Guidelines (WCAG)** — WCAG is the international standard for web accessibility, providing guidelines for making web content more accessible to people with disabilities. WCAG 2.2 is the current Recomm...
- **HTML Living Standard** — The HyperText Markup Language specification maintained by WHATWG as a living standard, published as a W3C Recommendation. HTML defines the semantic structure of web pages and fo...
- **CSS Specifications** — The Cascading Style Sheets (CSS) specification family maintained by the W3C CSS Working Group. CSS defines the presentation and styling of HTML documents. Key modules include CS...
- **JSON-LD** — JSON-LD (JSON for Linking Data) is a W3C Recommendation for encoding linked data using JSON. It provides a way to add semantic meaning to JSON documents through the use of @cont...
- **Verifiable Credentials** — The Verifiable Credentials Data Model is a W3C Recommendation enabling cryptographically secure, privacy-respecting digital credentials. The VC family includes the data model, d...
- **WebAssembly** — WebAssembly (Wasm) is a W3C Recommendation defining a portable binary instruction format for a stack-based virtual machine. It enables near-native performance in web browsers fo...
- **WAI-ARIA** — Accessible Rich Internet Applications (WAI-ARIA) is a W3C Recommendation defining a set of HTML attributes that define ways to make web content and web applications more accessi...
- **RDF and SPARQL** — The Resource Description Framework (RDF) is a W3C standard for representing information in the web. RDF 1.2 and SPARQL 1.2 are the latest versions, providing the foundation for ...
- **Digital Credentials API** — The W3C Digital Credentials API provides browser support for mediating presentation and issuance of digital credentials such as digital identity documents. It enables web applic...
- **W3C Affiliations API** — The Affiliations API from W3C — 2 operation(s) for affiliations.
- **W3C Ecosystems API** — The Ecosystems API from W3C — 1 operation(s) for ecosystems.
- **W3C Groups API** — The Groups API from W3C — 2 operation(s) for groups.
- **W3C Specifications API** — The Specifications API from W3C — 3 operation(s) for specifications.
- **W3C Translations API** — The Translations API from W3C — 1 operation(s) for translations.

## Agentic access (1)

- **W3C Agentic Access** — 9 operations

## Security (1)

- **W3C Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **W3C Plans Pricing**

## Tags

Accessibility, Standards, Web, Web Standards

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/w3c/). Scores are computed from the provider's own public artifacts under a published rubric.