Sass

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

OpenAPI

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

Sitemap

A file in XML format that allows webmasters to inform search engines about URLs on a website that are available for web crawling.

RDF

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

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.

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.

LLMs.txt

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

Prerender

The rel="prerender" attribute on HTML elements.

Humans.txt

A text file that can be created by developers to list the people who have contributed to 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.

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.

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.

Onion

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

OpenTelemetry

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

XMP

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

XRDS

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

A non-proprietary protocol for encrypting email using public key cryptography.

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.

IDN

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