Web Standards

aid: web-standards
name: Web Standards
description: Specifications and guidelines that define how web technologies should work, ensuring interoperability and consistency
  across browsers and platforms. Web standards are developed by organizations like W3C, WHATWG, IETF, and ECMA International.
  This topic covers the full landscape of web standards including HTML, CSS, JavaScript APIs, networking, security, graphics,
  media, and emerging technologies.
type: Index
url: https://www.w3.org/standards/
tags:
- Browser Compatibility
- CSS
- HTML
- Interoperability
- JavaScript
- Standards
- Web APIs
- Web Development
created: '2025'
modified: '2026-05-03'
specificationVersion: '0.19'
apis:
- aid: web-standards:whatwg-html
  name: WHATWG HTML Living Standard
  description: The core markup language of the web, including Web Workers, localStorage, history, the canvas element, forms,
    and numerous JavaScript APIs. Maintained by WHATWG and published as a continuously updated Living Standard.
  humanURL: https://html.spec.whatwg.org/multipage/
  tags:
  - HTML
  - Living Standard
  - WHATWG
  - Web APIs
  properties:
  - type: Documentation
    url: https://html.spec.whatwg.org/multipage/
  - type: GitHubRepository
    url: https://github.com/whatwg/html
- aid: web-standards:whatwg-fetch
  name: WHATWG Fetch Living Standard
  description: The networking model for resource retrieval on the web. Defines the Fetch API used by browsers and JavaScript
    to make HTTP requests, replacing the older XMLHttpRequest API.
  humanURL: https://fetch.spec.whatwg.org/
  tags:
  - Fetch API
  - HTTP
  - Living Standard
  - Networking
  - WHATWG
  properties:
  - type: Documentation
    url: https://fetch.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/fetch
- aid: web-standards:whatwg-dom
  name: WHATWG DOM Living Standard
  description: The core infrastructure used to define the web. Specifies the Document Object Model (DOM), which represents
    HTML/XML documents as a tree of nodes that scripts can manipulate.
  humanURL: https://dom.spec.whatwg.org/
  tags:
  - DOM
  - Living Standard
  - WHATWG
  - Web APIs
  properties:
  - type: Documentation
    url: https://dom.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/dom
- aid: web-standards:whatwg-url
  name: WHATWG URL Living Standard
  description: Infrastructure and algorithms around URLs on the web. Defines how URLs are parsed, serialized, and resolved,
    and specifies the URL and URLSearchParams APIs.
  humanURL: https://url.spec.whatwg.org/
  tags:
  - Living Standard
  - URL
  - WHATWG
  properties:
  - type: Documentation
    url: https://url.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/url
- aid: web-standards:whatwg-streams
  name: WHATWG Streams Living Standard
  description: APIs for creating, composing, and consuming streams of data. Defines ReadableStream, WritableStream, and TransformStream
    interfaces for efficient data processing.
  humanURL: https://streams.spec.whatwg.org/
  tags:
  - Living Standard
  - Streaming
  - WHATWG
  - Web APIs
  properties:
  - type: Documentation
    url: https://streams.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/streams
- aid: web-standards:whatwg-websockets
  name: WHATWG WebSockets Living Standard
  description: APIs to enable web applications to maintain bidirectional communications with server-side processes. Defines
    the WebSocket interface for full-duplex communication channels over a single TCP connection.
  humanURL: https://websockets.spec.whatwg.org/
  tags:
  - Living Standard
  - Real-Time
  - WebSockets
  - WHATWG
  properties:
  - type: Documentation
    url: https://websockets.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/websockets
- aid: web-standards:whatwg-storage
  name: WHATWG Storage Living Standard
  description: Persistent storage API, quota management, and platform storage architecture. Defines how web applications can
    store data persistently and manage storage quotas.
  humanURL: https://storage.spec.whatwg.org/
  tags:
  - Living Standard
  - Storage
  - WHATWG
  - Web APIs
  properties:
  - type: Documentation
    url: https://storage.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/storage
- aid: web-standards:whatwg-encoding
  name: WHATWG Encoding Living Standard
  description: Character encoding functionality on the web. Defines the TextEncoder and TextDecoder APIs for converting between
    strings and binary data using various character encodings.
  humanURL: https://encoding.spec.whatwg.org/
  tags:
  - Character Encoding
  - Living Standard
  - WHATWG
  properties:
  - type: Documentation
    url: https://encoding.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/encoding
- aid: web-standards:whatwg-notifications
  name: WHATWG Notifications API Living Standard
  description: Provides an API allowing web pages to control the display of system notifications to end users, enabling alerts
    outside the context of a web page.
  humanURL: https://notifications.spec.whatwg.org/
  tags:
  - Living Standard
  - Notifications
  - WHATWG
  properties:
  - type: Documentation
    url: https://notifications.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/notifications
- aid: web-standards:whatwg-file-system
  name: WHATWG File System Living Standard
  description: Infrastructure and API for accessing the file system. Provides FileSystemHandle, FileSystemFileHandle, and
    FileSystemDirectoryHandle interfaces for reading and writing files on the user's local device.
  humanURL: https://fs.spec.whatwg.org/
  tags:
  - File System
  - Living Standard
  - Storage
  - WHATWG
  properties:
  - type: Documentation
    url: https://fs.spec.whatwg.org/
  - type: GitHubRepository
    url: https://github.com/whatwg/fs
- aid: web-standards:w3c-css
  name: W3C CSS Specifications
  description: Cascading Style Sheets specifications developed by the W3C CSS Working Group. Covers layout (Flexbox, Grid),
    selectors, animations, transforms, custom properties, and all aspects of web presentation.
  humanURL: https://www.w3.org/Style/CSS/
  tags:
  - CSS
  - Layout
  - Styling
  - W3C
  properties:
  - type: Documentation
    url: https://www.w3.org/Style/CSS/
  - type: GitHubOrganization
    url: https://github.com/w3c/csswg-drafts
- aid: web-standards:w3c-webauthn
  name: W3C Web Authentication (WebAuthn)
  description: A W3C Recommendation that defines a strong authentication API for web applications, enabling passwordless and
    multi-factor authentication using public key cryptography and hardware authenticators.
  humanURL: https://www.w3.org/TR/webauthn/
  tags:
  - Authentication
  - Security
  - W3C
  - WebAuthn
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/webauthn/
  - type: GitHubRepository
    url: https://github.com/w3c/webauthn
- aid: web-standards:w3c-webrtc
  name: W3C WebRTC
  description: Web Real-Time Communications specifications enabling peer-to-peer audio, video, and data communication directly
    between browsers without plugins. Developed by the W3C WebRTC Working Group.
  humanURL: https://www.w3.org/TR/webrtc/
  tags:
  - Communication
  - Real-Time
  - Video
  - W3C
  - WebRTC
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/webrtc/
  - type: GitHubRepository
    url: https://github.com/w3c/webrtc-pc
- aid: web-standards:w3c-webgpu
  name: W3C WebGPU
  description: A W3C specification providing a modern GPU-accelerated graphics and compute interface for the web. Developed
    by the GPU for the Web Working Group as a successor to WebGL.
  humanURL: https://www.w3.org/TR/webgpu/
  tags:
  - GPU
  - Graphics
  - W3C
  - WebGPU
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/webgpu/
  - type: GitHubRepository
    url: https://github.com/gpuweb/gpuweb
- aid: web-standards:w3c-web-components
  name: W3C Web Components
  description: 'A suite of W3C specifications enabling reusable custom elements: Custom Elements v1, Shadow DOM, and HTML
    Templates. Allows developers to create encapsulated, reusable UI components.'
  humanURL: https://www.w3.org/standards/techs/components
  tags:
  - Components
  - Custom Elements
  - Shadow DOM
  - W3C
  - Web Components
  properties:
  - type: Documentation
    url: https://developer.mozilla.org/en-US/docs/Web/API/Web_Components
  - type: GitHubRepository
    url: https://github.com/WICG/webcomponents
- aid: web-standards:w3c-service-workers
  name: W3C Service Workers
  description: A W3C specification that enables web applications to work offline, do background synchronization, and intercept
    network requests. Service Workers act as a programmable network proxy between the browser and network.
  humanURL: https://www.w3.org/TR/service-workers/
  tags:
  - Offline
  - Progressive Web Apps
  - Service Workers
  - W3C
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/service-workers/
  - type: GitHubRepository
    url: https://github.com/w3c/ServiceWorker
- aid: web-standards:w3c-payment-request
  name: W3C Payment Request API
  description: A W3C Recommendation that standardizes the checkout process on the web, reducing the need for forms by using
    browser-stored payment information and supporting multiple payment methods.
  humanURL: https://www.w3.org/TR/payment-request/
  tags:
  - Commerce
  - Payments
  - W3C
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/payment-request/
  - type: GitHubRepository
    url: https://github.com/w3c/payment-request
- aid: web-standards:w3c-webassembly
  name: W3C WebAssembly
  description: A portable binary instruction format for a stack-based virtual machine. Enables near-native performance for
    web applications written in languages like C, C++, and Rust.
  humanURL: https://www.w3.org/TR/wasm-core-1/
  tags:
  - Performance
  - W3C
  - WebAssembly
  properties:
  - type: Documentation
    url: https://webassembly.org/
  - type: GitHubRepository
    url: https://github.com/WebAssembly/spec
- aid: web-standards:w3c-json-ld
  name: W3C JSON-LD
  description: JSON-LD 1.1 is a W3C Recommendation for Linked Data in JSON format. Provides a method to encode Linked Data
    using JSON, enabling semantic interoperability and integration with the Semantic Web.
  humanURL: https://www.w3.org/TR/json-ld11/
  tags:
  - JSON-LD
  - Linked Data
  - Semantic Web
  - W3C
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/json-ld11/
  - type: GitHubRepository
    url: https://github.com/w3c/json-ld-syntax
- aid: web-standards:w3c-verifiable-credentials
  name: W3C Verifiable Credentials
  description: A W3C Recommendation that defines a data model for expressing credentials on the web in a cryptographically
    secure, privacy-respecting, and machine-verifiable way.
  humanURL: https://www.w3.org/TR/vc-data-model/
  tags:
  - Credentials
  - Identity
  - Privacy
  - Security
  - W3C
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/vc-data-model/
  - type: GitHubRepository
    url: https://github.com/w3c/vc-data-model
- aid: web-standards:w3c-web-ml
  name: W3C Web Neural Network API (WebNN)
  description: A W3C specification enabling hardware-accelerated machine learning inference directly in web browsers, providing
    a low-level API for neural network operations on CPUs, GPUs, and dedicated ML accelerators.
  humanURL: https://www.w3.org/TR/webnn/
  tags:
  - Artificial Intelligence
  - Machine Learning
  - W3C
  - WebNN
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/webnn/
  - type: GitHubRepository
    url: https://github.com/webmachinelearning/webnn
- aid: web-standards:w3c-did
  name: W3C Decentralized Identifiers (DIDs)
  description: A W3C Recommendation defining a new type of identifier enabling verifiable, decentralized digital identity.
    DIDs are globally unique, resolvable with high availability, and cryptographically verifiable.
  humanURL: https://www.w3.org/TR/did-core/
  tags:
  - Decentralized Identity
  - DID
  - Identity
  - W3C
  properties:
  - type: Documentation
    url: https://www.w3.org/TR/did-core/
  - type: GitHubRepository
    url: https://github.com/w3c/did-core
- aid: web-standards:ietf-http
  name: IETF HTTP Specifications
  description: The IETF HTTP Working Group specifications defining the HyperText Transfer Protocol. Includes HTTP/1.1 (RFC
    9110), HTTP/2 (RFC 9113), HTTP/3 (RFC 9114), and related standards for caching, cookies, and security headers.
  humanURL: https://httpwg.org/
  tags:
  - HTTP
  - IETF
  - Networking
  - Protocol
  properties:
  - type: Documentation
    url: https://httpwg.org/specs/
  - type: GitHubOrganization
    url: https://github.com/httpwg
- aid: web-standards:ecma-javascript
  name: ECMA JavaScript (ECMAScript)
  description: The ECMAScript specification (ECMA-262) defines the JavaScript programming language. Published annually by
    TC39 with new features, ECMAScript is the foundation for all JavaScript runtime environments including browsers and Node.js.
  humanURL: https://ecma-international.org/publications-and-standards/standards/ecma-262/
  tags:
  - ECMAScript
  - JavaScript
  - Programming Language
  - Standards
  properties:
  - type: Documentation
    url: https://tc39.es/ecma262/
  - type: GitHubRepository
    url: https://github.com/tc39/ecma262
  - type: GitHubOrganization
    url: https://github.com/tc39
common:
- type: DomainSecurity
  url: security/web-standards-domain-security.yml
- url: https://www.w3.org/
  name: World Wide Web Consortium (W3C)
  type: Website
  description: The main standards body for web technologies.
- url: https://whatwg.org/
  name: WHATWG
  type: Website
  description: Web Hypertext Application Technology Working Group, maintainers of Living Standards.
- url: https://ietf.org/
  name: Internet Engineering Task Force (IETF)
  type: Website
  description: Standards body for internet protocols including HTTP.
- url: https://ecma-international.org/
  name: ECMA International
  type: Website
  description: Standards body for ECMAScript (JavaScript) and other computing standards.
- url: https://www.w3.org/TR/
  name: W3C Technical Reports
  type: Documentation
  description: Complete directory of all W3C specifications and standards.
- url: https://developer.mozilla.org/en-US/docs/Web/API
  name: MDN Web APIs Reference
  type: APIReference
  description: Comprehensive reference for all Web APIs implemented in browsers.
- url: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference
  name: MDN JavaScript Reference
  type: APIReference
  description: Reference documentation for the JavaScript language and standard library.
- url: https://caniuse.com/
  name: Can I Use
  type: Tools
  description: Browser support tables for HTML5, CSS3, and other web standards.
- url: https://wpt.fyi/
  name: web-platform-tests
  type: Tools
  description: Cross-browser test suite for web platform specifications.
- url: https://github.com/web-platform-tests/wpt
  name: web-platform-tests GitHub
  type: GitHubRepository
  description: Repository for cross-browser web platform compliance test suite.
- url: https://github.com/w3c
  name: W3C GitHub Organization
  type: GitHubOrganization
  description: GitHub organization hosting W3C specification repositories.
- url: https://github.com/whatwg
  name: WHATWG GitHub Organization
  type: GitHubOrganization
  description: GitHub organization hosting WHATWG Living Standard repositories.
- url: https://github.com/tc39
  name: TC39 GitHub Organization
  type: GitHubOrganization
  description: GitHub organization for ECMAScript proposals and the specification.
- url: https://github.com/WICG
  name: WICG GitHub Organization
  type: GitHubOrganization
  description: Web Incubator Community Group for incubating new web platform features.
- type: JSONLD
  url: json-ld/web-standards-context.jsonld
- type: Vocabulary
  url: vocabulary/web-standards-vocabulary.yml
- name: Web Standards Features
  type: Features
  data:
  - name: Interoperability
    description: Web standards ensure that websites and applications work consistently across all browsers and platforms.
  - name: Progressive Enhancement
    description: Standards enable building experiences that work for all users and are enhanced for capable browsers.
  - name: Security and Privacy
    description: Standards define security mechanisms like CSP, CORS, WebAuthn, and privacy-preserving APIs.
  - name: Performance APIs
    description: Standards provide APIs for measuring and optimizing web application performance.
  - name: Offline Capabilities
    description: Service Workers and Storage APIs enable web applications to function without network access.
  - name: Real-Time Communication
    description: WebRTC and WebSockets enable peer-to-peer and server communication without plugins.
  - name: Hardware Access
    description: Device APIs provide controlled access to hardware like cameras, microphones, and sensors.
  - name: Machine Learning
    description: WebNN enables hardware-accelerated ML inference directly in the browser.
- name: Web Standards Use Cases
  type: UseCases
  data:
  - name: Progressive Web Apps
    description: Use Service Workers, Web Storage, Web Push, and Manifest specifications to build installable, offline-capable
      web applications.
  - name: Authentication
    description: Implement passwordless authentication with WebAuthn and Verifiable Credentials for secure, phishing-resistant
      login.
  - name: Real-Time Collaboration
    description: Use WebRTC, WebSockets, and Broadcast Channel API for real-time data sharing and video/audio communication.
  - name: E-Commerce
    description: Streamline checkout with Payment Request API and Web Authentication for secure, frictionless transactions.
  - name: Data Visualization
    description: Use WebGL, WebGPU, Canvas API, and SVG for high-performance, hardware-accelerated graphics and charts.
  - name: Content Management
    description: Use Streams API, Fetch API, and IndexedDB for efficient content loading, caching, and storage.
  - name: Accessibility
    description: Apply WCAG guidelines and ARIA attributes to make web content accessible to all users.
  - name: Internationalization
    description: Use Encoding API and Intl APIs to support global audiences with proper text handling.
- name: Web Standards Integrations
  type: Integrations
  data:
  - name: Browser Vendors
    description: Chrome, Firefox, Safari, and Edge implement web standards to provide consistent capabilities across platforms.
  - name: JavaScript Runtimes
    description: Node.js, Deno, and Bun implement web standard APIs including Fetch, Streams, WebCrypto, and URL.
  - name: Server Frameworks
    description: Express, Fastify, Hono, and other frameworks align with web standard request/response models.
  - name: Build Tools
    description: Vite, Webpack, and esbuild target web standards to produce optimized web applications.
  - name: Testing Frameworks
    description: Playwright, WebDriver, and Puppeteer automate browsers using WebDriver and related specifications.
  - name: Edge Runtimes
    description: Cloudflare Workers, Vercel Edge, and Deno Deploy implement web standard APIs for edge computing.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com