Many things are listed at W3C’s Technical Reports index.
Below I just list some links of specs I either use or am vaguely interested in.
- HTTP
- https://datatracker.ietf.org/doc/html/rfc9110 (Semantics)
- https://datatracker.ietf.org/doc/html/rfc9113 (HTTP/2)
- https://datatracker.ietf.org/doc/html/rfc9114 (HTTP/3)
- https://httpwg.org/ (Working group)
- ECMAScript (for JavaScript)
- https://tc39.es/ecma262/multipage/ (multipage)
- https://tc39.es/ecma262/ (single page)
- WebGL
- https://www.khronos.org/registry/webgl/specs/latest/2.0 (WebGL 2)
- https://registry.khronos.org/webgl/specs/latest/1.0/ (WebGL 1)
- Web Audio
- https://www.w3.org/TR/webaudio/
- WebRTC
- https://www.w3.org/TR/webrtc/
- https://www.w3.org/TR/mediacapture-streams/ (Media Capture and Streams)
- https://www.w3.org/TR/mediacapture-fromelement/ (Media Capture from DOM elements)
- https://datatracker.ietf.org/doc/html/draft-ietf-wish-whip (WHIP draft)
- WebSockets
- https://websockets.spec.whatwg.org/
- Streams
- https://streams.spec.whatwg.org/
- XMLHttpRequest (XHR)
- https://xhr.spec.whatwg.org/
- Service Workers
- https://w3c.github.io/ServiceWorker/
- WebDriver
- https://www.w3.org/TR/webdriver2/ (working draft)
- Web Cryptography API
- https://www.w3.org/TR/WebCryptoAPI/
- Web Content Accessibility Guidelines (WCAG)
- https://www.w3.org/TR/WCAG22/
- Accessible Rich Internet Applications (ARIA)
- https://www.w3.org/TR/wai-aria-1.1/
- WOFF2 (fonts)
- https://www.w3.org/TR/WOFF2/
- ActivityPub
- https://www.w3.org/TR/activitypub/
- WebAuthn
- https://www.w3.org/TR/webauthn-2/
- Media Fragments URI (for timestamped video/audio URLs)
- https://www.w3.org/TR/media-frags/
- Media Source Extensions
- https://www.w3.org/TR/media-source-2/
- CSS Paged Media
- https://www.w3.org/TR/css-page-3/