# HTML

**Canonical:** https://apis.io/providers/html/  
**Website:** https://html.spec.whatwg.org/  
**APIs profiled:** 0

HTML (HyperText Markup Language) is the standard markup language for creating web pages and web applications. Maintained as a Living Standard by WHATWG and developed in close coordination with the W3C, HTML defines the structure and semantics of web content alongside CSS for presentation and JavaScript for behavior. The current specification covers semantic elements, multimedia (audio, video, picture, track), the canvas API, forms with rich input types and validation, web storage, custom elements, the dialog and popover patterns, and a broad set of DOM and document conformance rules. This index covers HTML-related standards, specifications, references, and resources relevant to API designers and web developers building on top of HTTP.

## Kin Score — 6.4 / 100 (minimal)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 6.4).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 7.1 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 0.0 (human-only)

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

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Html Domain Security** — TLSv1.2 · HSTS

## Tags

HTML, Living Standard, Markup Language, Semantic Web, W3C, Web Development, Web Standards, WHATWG

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