A collection of

Specifications for the web

(At least some of the ones I’m interested in)

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.

HTML
https://html.spec.whatwg.org/multipage/
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)
SVG
https://www.w3.org/TR/SVG/
CSS
https://www.w3.org/Style/CSS/
https://wiki.csswg.org/ (working group)
MathML
https://www.w3.org/TR/MathML/
WebGL
https://www.khronos.org/registry/webgl/specs/latest/2.0 (WebGL 2)
https://registry.khronos.org/webgl/specs/latest/1.0/ (WebGL 1)
URIs
https://datatracker.ietf.org/doc/html/rfc3986
URLs
https://url.spec.whatwg.org/
DOM
https://dom.spec.whatwg.org/
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/
Fetch
https://fetch.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)
WebM
https://www.webmproject.org/docs/container/
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/
JSON
https://ecma-international.org/publications-and-standards/standards/ecma-404/
Content Security Policy (CSP)
https://www.w3.org/TR/CSP2/
https://www.w3.org/TR/CSP/ (Latest)
WebAuthn
https://www.w3.org/TR/webauthn-2/
XML
https://www.w3.org/TR/xml/