Enable support for case insensitive attribute matching in selectors

Generate errors that contain a code frame that point to source locations.

JS Object representation of a stack frame

Polyfill requestAnimationFrame and cancelAnimationFrame

An efficient queue capable of managing thousands of concurrent animations.

A frame-synced render loop for JavaScript

Frame ticker with easy events for animation or games in JavaScript or TypeScript

Generic extension manager for WebSocket connections

Middleware to set X-Frame-Options headers

Secure iframe rendering for untrusted content using SafeContentFrame

a CSS selector compiler/engine

Open Web data by the Mozilla Developer Network

A tiny utility to create code frames

A tool set for CSS: fast detailed parser (CSS → AST), walker (AST traversal), generator (AST → CSS) and lexer (validation and matching) based on specs and browser implementations

Algorithms to help you parse CSS from an array of tokens.

Parse CSS color values

React component to wrap your application or component in an iFrame for encapsulation purposes

Solve CSS math expressions

Tokenize CSS

PostCSS plugin for CSS Modules to pass arbitrary values between your module files