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.

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

Sass

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

Text

The plain text document format.

OpenAPI

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

Sitemap

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

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.

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.

XML

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

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.

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.

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.

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.

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.

XMP

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

OpenTelemetry

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

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.

IDN

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

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.