# HTML5

**Canonical:** https://apis.io/providers/html5/  
**Website:** https://html.spec.whatwg.org/  
**APIs profiled:** 0

HTML5 is the fifth major version of the HyperText Markup Language used for structuring and presenting content on the web. Standardized by the W3C in 2014 and now maintained by WHATWG as the HTML Living Standard, HTML5 introduced semantic elements (article, section, nav, header, footer, aside), native multimedia via the audio and video elements, the canvas drawing surface, web storage (localStorage and sessionStorage), geolocation, drag-and-drop, offline application support, Web Workers for background processing, and richer form input types with built-in validation. HTML5 remains the foundation for modern web applications and the substrate that HTTP-based APIs ultimately render and consume on the client.

## 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)

- **Html5 Domain Security** — TLSv1.2 · HSTS

## Tags

Frontend, HTML5, Living Standard, Markup Language, Multimedia, Semantic Web, W3C, Web Development, WHATWG

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/html5/). Scores are computed from the provider's own public artifacts under a published rubric.