Sass

A stylesheet language that compiles to CSS and allows developers to use variables, nested rules, mixins, and functions.

Markdown

A lightweight markup language used to add formatting to plain text documents using simple, human-readable syntax.

Sitemap

A specialized XML file that lists a website's URLs and helps search engines discover pages available for crawling and indexing.

OpenID

A decentralized authentication protocol based on OAuth 2.0 that enables applications to verify a user's identity through an external identity provider instead of managing credentials directly.

Text

The plain text document format.

RelMeAuth

A proposed open standard for using rel-me links to profiles on OAuth supporting services to authenticate via either those profiles or your own site.

OpenAPI

A specification language for defining HTTP APIs, typically written in YAML or JSON.

CGI

An interface specification that enables web servers to execute an external program to process HTTP requests.

JSON Web Token

An open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.

Prerender

A deprecated browser hint that instructed web browsers to preload and render a web page in the background before navigation occurred.

IDN

Internationalized Domain Names allow people around the world to use domain names in local languages, such as Arabic, Chinese, or Cyrillic.

LLMs.txt

A proposed standard that provides structured content and instructions to guide large language models in understanding and summarizing a website's content.

WebAssembly

A portable binary instruction format that runs in modern web browsers with near-native performance, enabling frontend coding in languages that were not traditionally used for web interfaces, such as C/C++, C#, and Rust.

Webmention

A simple protocol to notify any URL when a website links to it, and for web pages to request notifications when somebody links to them.

Rack

A minimal, modular interface and invocation convention that operates between Ruby web servers and web applications to standardize how HTTP requests and responses are exchanged.

ActivityPub

A decentralized social networking protocol used by various Fediverse services such as Mastodon, Pixelfed, and PeerTube.

ESI

A simple markup language used to define web page components for dynamic assembly and delivery of web applications at the edge of the Internet.

OpenTelemetry

An open-source, vendor-neutral observability framework and toolkit for collecting, processing, and exporting telemetry data such as traces, metrics, and logs.

XMP

An ISO standard for creating, processing, and exchanging metadata for digital documents.

Onion

Sites are websites on the dark web that use the .onion top-level domain and are only accessible through online routing through Tor.

XRDS

An XML-based file format that provides a list of service endpoints (e.g., OpenID) available on a website.

A peer-to-peer protocol for storing and accessing files and websites in a decentralized file system.

AdChoices

A self-regulatory standard for online interest-based advertising that gives consumers enhanced control over the collection and use of their data to deliver relevant ads.

IndieAuth

A decentralized identity protocol built on top of OAuth 2.0.

WCAG

The Web Content Accessibility Guidelines are an international standard developed by the W3C that defines how to make web content, including text and media, accessible to people with disabilities.