HTML

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.

HTML is profiled on the APIs.io network. Tagged areas include HTML, Living Standard, Markup Language, Semantic Web, and W3C.

🌐 Visit website 📡 Source on GitHub

6.4/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

0 APIs

HTMLLiving StandardMarkup Language Semantic Web W3C Web Development Web StandardsWHATWG

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 6.4/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.4 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/html: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Documentation 2

Reference material describing how the API behaves

Reference

Reference

Multipage Specification

Multipage Specification

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Wikipedia

Wikipedia

Source (apis.yml)

aid: html
name: HTML
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/html/refs/heads/main/apis.yml
type: Index
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/html.png
tags:
- HTML
- Living Standard
- Markup Language
- Semantic Web
- W3C
- Web Development
- Web Standards
- WHATWG
created: '2025'
modified: '2026-04-28'
specificationVersion: '0.23'
apis: []
common:
- type: DomainSecurity
  url: security/html-domain-security.yml
- type: Website
  url: https://html.spec.whatwg.org/
- type: Reference
  url: https://developer.mozilla.org/en-US/docs/Web/HTML
- type: Multipage Specification
  url: https://html.spec.whatwg.org/multipage/
- type: Wikipedia
  url: https://en.wikipedia.org/wiki/HTML
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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