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

Trace Context

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

Text

The plain text document format.

Markdown

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

OpenAPI

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

Prerender

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

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.

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.

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.

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.