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.

Trace Context

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

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

XML

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

GraphQL

A data query and manipulation language for APIs typically used for remote client-server communications.

LLMs.txt

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

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.

OpenAPI

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

Humans.txt

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

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.

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.

ActivityPub

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

XRDS

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

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.

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.

OpenTelemetry

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