JSPM

A BroadcastChannel that works in New Browsers, Old Browsers, WebWorkers

Ponyfill for smooth scrolling elements into view (if needed!)

A polyfill for the proposed inert API

A Barcode Detection API polyfill that uses ZXing webassembly under the hood

Polyfill object-fit and object-position on images on IE9, IE10, IE11, Edge, Safari, ...

Polyfill for the Proxy object

Deno namespace shim for Node.js

Wrapper for the Page Visibility API

An ES spec-compliant `Array.prototype.forEach` shim/polyfill/replacement that works as far down as ES3.

Polyfill for navigator.sendBeacon()

Polyfill for RFC 566: @cached

A fork of create-react-context in MIT license

An ES-spec-compliant (proposed) Array.prototype.at shim/polyfill/replacement that works as far down as ES3

A polyfill for Ember CLI's TypeScript blueprint capabilities.

An ES5 mostly-spec-compliant `Object.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible

Polyfill for RFC 580: Destroyables

A polyfill for the Record and Tuple Stage 2 ECMAScript proposal.

Javascript Error Polyfill

MediaRecorder polyfill to record audio in Edge and Safari

Polyfill requestAnimationFrame and cancelAnimationFrame

This package includes the [core-js](https://github.com/zloirock/core-js) polyfill for `String#replaceAll`, along with TypeScript typings.

A robust & optimized `String.prototype.startsWith` polyfill, based on the ECMAScript 6 specification.

Polyfill for the basic functionality of `Function.name` accessor property in its pre-ES6 form

Popover Attribute Polyfill

Smooth Scroll behavior polyfill

polyfill for `KeyboardEvent.prototype.key`

A polyfill for the element internals specification

A cross browser solution to scrolling during drag and drop.

JavaScript polyfill for the WHATWG spec of focusOptions, that enables a set of options to be passed to the focus method.

A Javascript utility library for working with native objects.

Transit is a data format and a set of libraries for conveying values between applications written in different languages. This library provides support for marshalling Transit data to/from Javascript.

PostCSS plugin for Flexibility polyfill

CSSOM-valid and jsdom/Jest-compatible matchMedia polyfill for server-side unit tests

Standard library

A minimal polyfill for Element.closest

A JavaScript polyfill for Flexbox

Super small `Element.matches` fix for older browsers (IE 9+, Edge 12+, Safari, Android browsers)

CanvasRenderingContext2D.roundRect() and Path2D.roundRect() polyfill

A polyfill for Ember.assign in <= 2.4

MDN polyfills

A polyfill for the 'scroll-behavior' CSS-property

Polyfill for ES6 Promise

Quick wrapper that finds TextDecoder or polyfills a bad implementation

Polyfill for CSS `position: sticky`

A polyfill for crypto.randomFill and crypto.randomFillSync from Node.js core

Polyfill for making HTML5 drag and drop possible in all browsers.

Replaces `arr.includes(val)' with `arr.indexOf(val) >= 0`.

ECMAScript 7 compatibility shims for legacy JavaScript engines

Node's util.inspect, extracted for use on the Web

Round a double-precision floating-point number toward zero.

Returns the first index at which a given element can be found.

W3C's Fullscreen API Polyfill

Return the first index at which a given element can be found.

<form>.requestSubmit() polyfill

Simple ES6 Object.assign() polyfill for older environments.

User Timing polyfill

A polyfill that fetches external SVGs referenced in use elements when the browser itself fails to do so.

Provide helpers that polyfill all methods defined in [iterator helpers proposal](https://github.com/tc39/proposal-iterator-helpers), both for `Iterator` and `AsyncIterator`, and even more.

A robust & optimized `String.prototype.endsWith` polyfill, based on the ECMAScript 6 specification.

Browser polyfill for making React Native compatible with web libs like pixi.js, three.js, phaser.js

An ES-spec-compliant shim/polyfill/replacement for the `.cause` property on all Error types that works as far down as ES3

A polyfill for the Resize Observer API

All inclusive customElements polyfill for every browser

Object.fromEntries() polyfill

HTML <details> element polyfill

WebAssembly interpreter

Validate your forms, frontend, without writing a single line of javascript!

Scoped CustomElementRegistry Polyfill

An EventTarget polyfill

Polyfill/shim for stream.finished in node versions < v10

`Object.entries()` ponyfill

Runtime polyfills for TypeScript libs, powered by core-js!

React component for anchor links using the smoothscroll polyfill.

Polyfill for the proposed CSS anchor positioning spec

A polyfill for the native import() in the browser

An ES-spec-compliant Set shim/polyfill/replacement that works as far down as ES3

An ESnext spec-compliant `DisposableStack`, `AsyncDisposableStack`, `Symbol.dispose`, and `Symbol.asyncDispose` shim/polyfill/replacement that works as far down as ES3.

ES Proposal spec-compliant shim for SuppressedError

Polyfill/shim for stream.pipeline in node versions < v10

Compatibility layer for efficient streaming of binary data using [WHATWG Streams](https://streams.spec.whatwg.org/)

Object.setPrototypeOf Polyfill

A cross browser solution to scrolling during drag and drop.

Polyfills and patches missing or partially supported web and core APIs

An ES-spec-compliant Map shim/polyfill/replacement that works as far down as ES3

An ESnext spec-compliant `Set.prototype.difference` shim/polyfill/replacement that works as far down as ES3

A polyfill of IntersectionObserver API

Patches global.Promise to use bluebird and returns a bluebird instance

fs.promises polyfill

A browser polyfill for W3C EventSource (http://www.w3.org/TR/eventsource/)

polyfill for es8 Object.values

Cross-browser implementation of W3C saveAs API

Tiny Web Share API Wrapper with fallback for unsupported browsers

Polyfills the a[download] attribute

Standardizer for node's console.assert

The minimal set of polyfills that the Aurelia platform needs to run on ES5 browsers.

Compute the arcsine of a double-precision floating-point number.

ECMAScript Map like object.

Polyfill for scrollend event

An ES5 spec-compliant `Array.prototype.some` shim/polyfill/replacement that works as far down as ES3.

get-own-property-symbols ========================

Simple, small and fast jQuery polyfill for the HTML5 <input type="range"> slider element

TypeScript shim for DOMMatrix

Determines whether a string ends with the characters of another string.

An accessible polyfill for `[input type='time']` elements modeled after the Chrome & Firefox desktop implementations.

A fully spec-compliant polyfill for 'Intl.ListFormat'

Polyfill for BroadcastChannel for Safari, old Chrome and Opera

Small vanilla javascript that feature detect the :focus-within pseudo selector and polyfills it with a standard css class if necessary.

A canvas.toBlob() implementation

A polyfill for the proposed blocking elements stack API

Compute the arccosine of a double-precision floating-point number.

Polyfill Web Speech API with Cognitive Services Speech-to-Text service

Polyfill to provide array.find on IE.

High performance WebRTC polyfill for Node.JS via libdatachannel using Node Native/NAPI.

Cross-platform Blob implementation for NodeJS and the Web.

A jquery polyfill for the old, removed $.live() method

React.createRef() polyfill

An essential WeakMap polyfill for legacy browsers.

PostCSS plugin that updates the standard object-fit tag to work with the object-fit-images polyfill for browsers that do not natively support object-fit.

An trim polyfill for legacy browsers.

Return elements matching a selector relative to the current node

`core-js`'s `web/url.js` prebundled for the browser

Run ES Module syntax in any browser – even IE!

Simple polyfill for the NodeList.forEach method.

A polyfill for the Cookie Store API

An Object.fromEntries polyfill

console.time, console.timeLog and console.timeEnd polyfill for react-native

Polyfill for the HTML5 `<details>` element

Canvas toBlob polyfill

html5 storage interface for node and browser

Ember cli addon that includes a polyfill for closest() if needed.

CSS.supports() shim

An importNode polyfill for IE11 and other legacy browsers

W3C compliant EventSource client for Node.js and browser (polyfill)

Plugin for injecting a polyfills loader to HTML pages

A simple SDP interoperability layer for Unified Plan/Plan B

ES2015 WeakMap polyfill for Ember.WeakMap

Web Streams, based on the WHATWG spec reference implementation

An ESnext spec-compliant `Set.prototype.intersection` shim/polyfill/replacement that works as far down as ES3

Tiny KeyboardEvent#key shim for IE and MS Edge

A small mostly spec. compliant polyfill/ponyfill for SharedWorkers, it acts as a drop in replacement for normal Workers, and supports an API surface that matches normal Workers.

<h1 align="center" style="border-bottom: none;">🔎 PerformanceObserver Polyfill</h1> <p align="center"> <a href="https://travis-ci.org/fastly/performance-observer-polyfill"> <img alt="Travis" src="https://img.shields.io/travis/fastly/performance-obs

A minimal polyfill for Element scroll extensions.

A polyfill for missing Object.values / Object.entries

Polyfill for SVG 2 getPathData() and setPathData() methods

ARIA element reflection polyfill for strings

Polyfill for Function.prototype.bind

Shadow DOM polyfill

ES6 Map Implemented in TypeScript

This fork provide the following on top of the original:

Polyfill for EventTarget options object support

WebAssembly interpreter

ES Proposal spec-compliant shim for Promise.withResolvers

An Event polyfill for legacy browsers.

HTML5 HTMLElement.dataset ponyfill

Development server for modern web apps

An ESnext spec-compliant `Set.prototype.union` shim/polyfill/replacement that works as far down as ES3

Light-weight wrapper for the newer Promise-based MediaDevices.getUserMedia API with a fallback to navigator.getUserMedia (and it's prefixed variants)

A WebAssembly polyfill for the Barcode Detection API

A Laravel Mix extension to include polyfills by using Babel, core-js, and regenerator-runtime

Ponyfill for React 16's <React.Fragment> component

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WeakSet for IE11 and engines with a WeakMap

EyeDropper API Polyfill

Array#forEach ponyfill for older browsers

A robust & optimized `Array.from` polyfill, based on the ECMAScript 6 specification.

A simple polyfill implementation of W3C's JavaScript Fullscreen API spec. Don't worry about the vendor specific Fullscreen API.

A polyfill for SVG's SVGPathSeg and SVGPathSegList

Polyfills for various EcmaScript 5 and EcmaScript 6 methods distributed as CommonJS modules that can be require'd individually or as a whole.

Ease adding polyfills to Nuxt.js projects using Polyfill.io among others

This is a polyfill for TextEncoderStream.

No-bullshit super-simple es7 collections shim for Array#includes, Object.values, Object.entries

Element#classList for older browsers.

A lightweight implementation of the Unicode Text Segmentation (UAX #29)

small zero dependent polyfill for `Object.groupBy` and `Map.groupBy`

An ES spec-compliant `Array.prototype.push` shim/polyfill/replacement that works as far down as ES3.

A minimal and dependency-free vanilla JavaScript datalist polyfill. Supports all standard's functionality as well as mimics other browsers behavior.

ES spec-compliant `Array.prototype.slice` shim/polyfill/replacement that works as far down as ES3

Babel 6 polyfill for IE<=10

Lightweight polyfill/ponyfill for the Compression Streams API

A screen.orientation ponyfill 🖥

Automatically adds datepickers to input[type=date] on IE, Firefox, and OS X Safari.

JavaScript polyfills

Polyfills for TextEncoder/TextDecoder

A CustomEvent polyfill for legacy browsers.

Karma plugin for testing with es modules

An ES-spec-compliant (proposed) String.prototype.at shim/polyfill/replacement that works as far down as ES3

Loosely test a package's compliance with the es-shim API

An is-array polyfill for legacy browsers.

A cross-browser ponyfill for File with a working constructor

A simple polyfill for IE8 and 9 that populates the value when empty

All polyfills suggested by the Angular team

Fetch the current file and directory path, no matter your environment (Deno, Node.js, Web Browsers, ESM, CJS)

Cross-browser JavaScript shim that fully implements element.classList (referenced on MDN)

Polyfill for Node core `events.once

A shim for the iFrame "srcdoc" attribute

An ES spec-compliant `String.prototype.split` shim/polyfill/replacement that works as far down as ES3

WebGL2 API Polyfills for WebGL1 WebGLRenderingContext

Polyfill for window.location.origin

⚡ include core-js polyfills when bundling with rollup

Polyfill for Crypto instance methods of Web Crypto API

A feature detected fix for non unique template literals

Polyfill for HTML 5 Canvas features.

Essential WeakSet for legacy browsers.

Custom Properties polyfill for IE11.

An essential Map poorlyfill for legacy browsers.

ES spec-compliant `Array.prototype.join` shim/polyfill/replacement that works as far down as ES3.

Polyfilled smooth scrolling behavior and helper function for Gatsby sites.

A simple SDP interoperability layer for Unified Plan/Plan B

A window.resizeTo polyfill for test environments like Jest & JSDOM

importModule() is a polyfill of import().

Babel plugin that rewrites Promise references to es6-promise, but only if necessary

Simple ES6 Array.prototype.findIndex polyfill for older environments.

ES spec-compliant String.prototype.padStart shim.

The default blueprint for ember-cli addons.

Yet Another RequestAnimationFrame Polyfill

A polyfill that adds support for the CSS pseudo-class :has() to the DOM Selectors API (by extending .querySelector(), .querySelectorAll(), .matches(), .closest() or called directly)

Array.prototype.fill polyfill

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

Hyphenation for node and Polyfill for client-side hyphenation.

Helper for mounting Dom in unit tests

Plugin for generating an html file with rollup

npm package for https://github.com/mpizenberg/elm-pep

ES spec-compliant `Date` shim/polyfill/replacement that works as far down as ES3

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An AbortController Polyfill

Polyfill for the proposed React.createRef and React.forwardRef API

An HTML5 Blob implementation

Style elements when they are focused or contain a focused element

Apply smooth scroll to anchor links to replicate CSS scroll-behavior

A Gatsby plugin to polyfill your site with [Polyfill.io](https://polyfill.io/v2/docs/).

a polyfill for canvas getTransform, ellipse, resetTransform API

An ES2015 spec-compliant `Array.prototype.indexOf` shim/polyfill/replacement that works as far down as ES3.

Element.matches Polyfill

requestIdleCallback polyfill

native Blob interface support (polyfill)

Polyfill for Array.prototype.fill

Convert a file: URL to its path

new Event() polyfill

innerHTML polyfill for SVGElement

Focusin/focusout polyfill for Firefox

A Level 2 spec-compliant Pointer Events polyfill with first-class Shadow DOM support

A polyfill for IndexedDB using WebSql

ES7 spec-compliant String.prototype.padEnd shim.

Polyfill for the proposed React context API

An ESnext spec-compliant `Array.prototype.toSpliced` shim/polyfill/replacement that works as far down as ES3.

Array.from polyfill

An ESnext spec-compliant `String.prototype.toWellFormed` shim/polyfill/replacement that works as far down as ES3.

A PostCSS polyfill for adding gap between flex items

requestVideoFrameCallback polyfill

Polyfill for making HTML5 drag and drop possible in all browsers.