01Living Standard
HTML Living Standard
WHATWGStructure and semantics of Web interfaces used by people and agents.
STANDARDS & INTEROPERABILITY
Standards, protocols and proposals
A register distinguishing published standards, versioned protocols and experimental drafts. Each entry links to its original document; real support depends on implementations.
SPECIFICATION REGISTER
Status, organization and scope all matter
The stated status reflects the referenced document for this edition. Specifications and implementations evolve: open the original to verify the currently applicable version.
Published standardVersioned protocol / specificationDraft / proposal
02W3C Recommendation
JSON-LD 1.1
W3CExpressing linked data and structured relationships inside JSON documents.
03Candidate Recommendation Draft (dated edition)
WebGPU
W3C GPU for the Web WGGPU rendering and compute interface used by selected inference libraries.
04Specification under development
WebNN
W3C Web Machine Learning WGAccelerated neural graph API; browser and device support varies.
05Versioned open specification
Model Context Protocol
MCP maintainersStructured tools, resources and exchanges between AI clients and connected services.
06Open protocol; verify version
Agent2Agent (A2A)
A2A maintainersTask exchanges, messages and descriptive agent cards between agents.
07Community Group draft; not a W3C Standard
WebMCP
W3C Web Machine Learning Community GroupProposal for Web page JavaScript functions exposed as tools to agents.
08Versioned technical specification
C2PA
Coalition for Content Provenance and AuthenticityManifests, assertions and signing mechanisms for media provenance claims.
09W3C Recommendation
WCAG 2.2
W3C WAIWeb accessibility criteria, including interfaces producing dynamic content.
10Open specification
JSON Schema
JSON Schema communityDescription and structural validation of JSON inputs and outputs.
11Versioned open specification
OpenAPI Specification
OpenAPI InitiativeMachine-readable description of HTTP interfaces and operations.
Notice: an open specification does not by itself ensure universal interoperability, security compliance or institutional endorsement of WebAI.
CONTINUE THE REFERENCE
Connected evidence, not isolated pages
Use the encyclopedia to cross-reference concepts, explore technologies and inspect original sources before drawing conclusions.