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.

Sitemap

A specialized XML file that lists a website's URLs and helps search engines discover pages available for crawling and indexing.

Text

The plain text document format.

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.

Markdown

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

A set of criteria defined by the independent Acceptable Ads Committee that allows publishers to reach ad-blocking users with respectful, non-intrusive and relevant ads.

OpenAPI

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

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.

IDN

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

OpenTelemetry

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

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.

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.

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.

Humans.txt

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

Prerender

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

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.

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.