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

YAML

A human-readable data serialization language designed for representing structured data and exchanging it between systems and programming languages.

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.

Markdown

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

LLMs.txt

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

Trace Context

Defines standard HTTP headers and a value format for propagating context information that enables distributed tracing.

XML

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

Text

The plain text document format.

Onion

Sites are websites that use the .onion top-level domain and are only accessible through Tor, a decentralized anonymity network that relays traffic to hide the IP addresses of both visitors and hosts.

Humans.txt

A plain text file that allows website creators to identify and credit the people involved in developing a website.

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.

IDN

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

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.

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.

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.

ActivityPub

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