A backward-compatible CSS language extension inspired by Sass that supports variables, mixins, operations, and functions.

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.

IAB TCF

An open-source industry standard developed by IAB Europe that helps companies comply with GDPR and ePrivacy requirements when processing personal data in digital advertising ecosystems.

Text

The plain text document format.

OpenAPI

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

Markdown

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

XML

A markup language and file format for storing, transmitting, and reconstructing structured data in a platform-independent way.

Prerender

The rel="prerender" attribute on HTML elements.

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.

RDF

A W3C standard model to describe and exchange graph data on the web.

LLMs.txt

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

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.

OpenTelemetry

A vendor- and tool-agnostic observability framework and toolkit for creating and managing telemetry data such as traces, metrics, and logs.

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.

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.

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.

IndieAuth

A decentralized identity protocol built on top of OAuth 2.0.

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.

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.

XMP

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

Micropub

An HTTP-based client-server protocol used to create, update, and delete posts on servers using third-party clients.

XRDS

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

IDN

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

XSLT

A language designed for transforming XML documents into other documents.