Standard Library

🐕 Bare minimum 500b fetch polyfill.

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

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

🦄 Like polyfill but with pony pureness

Polyfills the ResizeObserver API.

📋 Simple copying on the web, with maximum browser compatibility. (You probably don't need this anymore!)

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).

Web Streams, based on the WHATWG spec reference implementation

WHATWG fetch ponyfill

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

Spec-compliant FormData implementation for Node.js

🎙MediaRecorder ponyfill that records audio as mp3

🖥 A screen.orientation ponyfill

Object.fromEntries() ponyfill (in 6 lines)

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

Ponyfill for Error#captureStackTrace