Top 169 polyfill open source projects

Transforming HTML standards of the future into JavaScript standards of the past

ECMAScript 5 Polyfill for IE-8

Proxy object polyfill

🦄 Like polyfill but with pony pureness

This polyfill is deprecated. Use the symfony/polyfill-php72 package instead.

📡 BroadcastChannel to send data between different browser-tabs or nodejs-processes 📡

Javascript polyfills as a service. Java implementation.

Make JSONP request like window.fetch

Modern DOM functionalities for every browser

This component provides a fallback implementation for the Normalizer class provided by the Intl extension.

A trivial but working polyfill for PHP 7.3 is_countable function. Supports PHP versions >= 5.3

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

This component provides functions unavailable in releases prior to PHP 8.0.

A docker sidecar container to forward all traffic to local docker host or any other host

CSS variables (Custom Properties) polyfill for IE11

Simple polyfill for URLSearchParams standard

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

Capture form validation back from the browser

A polyfill for native ES6 Promises as close as possible (no extensions) to the strict spec definitions.

A window.fetch JavaScript polyfill.

This component provides a partial, native PHP implementation of the Grapheme functions from the Intl extension.

StickyState is a high performant module making native position:sticky statefull and polyfilling the missing sticky browser feature

Polyfill for the proposed React context API

JSBI is a pure-JavaScript implementation of the official ECMAScript BigInt proposal.

Polyfill for the Encoding Living Standard's API

This component provides apcu_* functions and the APCUIterator class to users of the legacy APC extension.

Automatic polyfill service.

Bootstrap 3 CSS for IE7

CSS Custom Paint / Paint Worklet polyfill with special browser optimizations.

🐕 Bare minimum 500b fetch polyfill.

Make an image grayscale in all browsers

Toolchain for WebAssembly

Polyfills the ResizeObserver API.

🍩 1kb minimally viable DOM Document implementation

A Javascript polyfill for browsers that don't support the object-fit CSS property.

A Javascript library for working with native objects.

Backwards compatibility polyfill for React class components

A browser API to prevent DOM-Based Cross Site Scripting in modern web applications.

NodeJS module to create polyfill bundles tailored to individual user-agents.

AVIF polyfill for the browser

This component provides a partial, native PHP implementation for the Ctype extension.

A pure JS in-memory implementation of the IndexedDB API

Fast and lightweight dependency-free vanilla JavaScript polyfill for native lazy loading / the awesome loading='lazy'-attribute.

CSS3 Media Queries Shim

Promise packages, patterns, chat, and tutorials

This component provides features unavailable in releases prior to PHP 7.0.

A cross-browser wrapper for the Web Audio API which aims to closely follow the standard.

some damn DOM fix for this damned browser

Polyfill URL and URLSearchParams to match last ES7 specifications

HTML5 `FormData` polyfill for Browsers.

Bootstrap 4 for IE8 and IE9

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

A platform-agnostic drawer layout for react-native

Add polyfills to rogchap/v8go

Workaround for browser bugs in Range.prototype.getClientRects and Range.prototype.getBoundingClientRect.

.NET polyfill to the future. A versatile RAD framework for .NET platform.

Web Streams, based on the WHATWG spec reference implementation

Object.fromEntries() ponyfill (in 6 lines)

An up-to-date Device Parameter Database for the WebVR Polyfill

like core-js but for Web APIs (based on polyfill.io)