Standard Library

🐕 Bare minimum fetch polyfill in 500 bytes.

Promise packages, patterns, chat, and tutorials

A polyfill for the Resize Observer API

Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers

🦄 Like polyfill but with pony pureness

Element.scrollIntoView ponyfills for things like "if-needed" and "smooth"

📋 Simple copying on the web, with maximum browser compatibility.

A pure JS in-memory implementation of the IndexedDB API

Polyfill for the AbortController DOM API and abortable fetch (stub that calls catch, doesn't actually abort request).

Tiny library (<200B gzip) for deferring something by a "tick"

WHATWG fetch ponyfill

Web Streams, based on the WHATWG spec reference implementation

[DEPRECATED] Node.js `os.homedir()` ponyfill

Universal LocalStorage for browser and Node.js.

Object.fromEntries() ponyfill (in 6 lines)

🖥 A screen.orientation ponyfill

A curated list of awesome ponyfills for writing cross-platform and cross-browser code.

FormData.entries ponyfill

[DEPRECATED] Node.js os.tmpdir() ponyfill

A ponyfill/polyfill for browser Promise unhandledrejection events

🎙MediaRecorder ponyfill that records audio as mp3

(A smaller) polyfill for the react context API

A thin react component wrapper bundled with scroll-into-view-if-needed

🦄 Use React 16's <React.Fragment> in React 15

ES2015 Number.isSafeInteger() ponyfill

ES2015 Number.MAX_SAFE_INTEGER ponyfill

⛄ ES6 Symbol polyfill in pure ES5

A micro-library for manipulating CSS class names, triggering change events using HTML data attributes, and creating declarative class-related event listeners