The most advanced responsive front-end framework in the world. Quickly create prototypes and production code for sites that work on any kind of device.

Our original Web Component library.

Zepto.js is a minimalist JavaScript library for modern browsers, with a jQuery-compatible API

JavaScript Design Patterns

HTML Standard

Quickly create responsive HTML emails that work on any device and client. Even Outlook.

Make it a fun to create spec for developers and teammates

Test suites for Web platform specs — including WHATWG, W3C, and others

Sanitize untrusted HTML (to prevent XSS) with a configuration specified by a Whitelist

Assorted CSS and UI experiments.

Web Components specifications

CSS for clean and fast web apps

✂️ A grunt task for removing unused CSS from your projects.

Style tools for UI components

2017 edition of our front-end development guide

A Fast & Light Virtual DOM Alternative

Create HyperText with JavaScript.

Build your own personal finance analytics using Plaid, Google Sheets and CircleCI.

The {{official}} website

Polyfill for CSS `position: sticky`

Fetch Standard

An exceptionally fast, thorough and tiny unused-CSS cleaner

This is the official DTCG repository for the design tokens site and specification.

DOM Standard

The popular CSS3 patterns gallery, now on Github :)

Home for explainer documents originated by the Microsoft Edge team

Streams Standard

Official Website for Typeplate: “A Typographic Starter Kit.”

Isobar Front-end development coding standards. Memorize them BY HEART.

Web Content Accessibility Guidelines