JSPM

MediaRecorder polyfill to record audio in Edge and Safari

A cross browser solution to scrolling during drag and drop.

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.

Popover Attribute Polyfill

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

Smooth Scroll behavior polyfill

A Javascript utility library for working with native objects.

A polyfill for the element internals specification

PostCSS plugin for Flexibility polyfill

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

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.

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

Polyfill for ES6 Promise

Standard library

A JavaScript polyfill for Flexbox

A minimal polyfill for Element.closest

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

A polyfill for Ember.assign in <= 2.4

ECMAScript 7 compatibility shims for legacy JavaScript engines

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

MDN polyfills

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

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

Quick wrapper that finds TextDecoder or polyfills a bad implementation

Polyfill for CSS `position: sticky`

<form>.requestSubmit() polyfill

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

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

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

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

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

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

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

W3C's Fullscreen API Polyfill

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

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

User Timing polyfill

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.

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

Scoped CustomElementRegistry Polyfill

HTML <details> element polyfill

WebAssembly interpreter

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

An EventTarget polyfill

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

`Object.entries()` ponyfill

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

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

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

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

Standardizer for node's console.assert

A polyfill of IntersectionObserver API

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

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

fs.promises polyfill

polyfill for es8 Object.values

Cross-browser implementation of W3C saveAs API

Polyfills the a[download] attribute

Tiny Web Share API Wrapper with fallback for unsupported browsers

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 ========================

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

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

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

TypeScript shim for DOMMatrix

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

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

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

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.

Polyfill for BroadcastChannel for Safari, old Chrome and Opera

An trim polyfill for legacy browsers.

A canvas.toBlob() implementation

A polyfill for the proposed blocking elements stack API

Cross-platform Blob implementation for NodeJS and the Web.

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

Polyfill to provide array.find on IE.

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

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

React.createRef() polyfill

An essential WeakMap polyfill for legacy browsers.

Return elements matching a selector relative to the current node

Simple polyfill for the NodeList.forEach method.

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

Run ES Module syntax in any browser – even IE!

An Object.fromEntries polyfill

A polyfill for the Cookie Store API

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

A minimal polyfill for Element scroll extensions.

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

CSS.supports() shim

Shadow DOM polyfill

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

ARIA element reflection polyfill for strings

Polyfill for Function.prototype.bind

A polyfill for missing Object.values / Object.entries

Development server for modern web apps

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

ES6 Map Implemented in TypeScript

This fork provide the following on top of the original:

Polyfill for EventTarget options object support

A WebAssembly polyfill for the Barcode Detection API

WebAssembly interpreter

An Event polyfill for legacy browsers.

ES Proposal spec-compliant shim for Promise.withResolvers

HTML5 HTMLElement.dataset ponyfill

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

EyeDropper API Polyfill

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

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

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

A polyfill for SVG's SVGPathSeg and SVGPathSegList

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.

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

Element#classList for older browsers.

This is a polyfill for TextEncoderStream.

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

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

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

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

Babel 6 polyfill for IE<=10

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

A screen.orientation ponyfill 🖥

Lightweight polyfill/ponyfill for the Compression Streams API

JavaScript polyfills

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

Polyfills for TextEncoder/TextDecoder

Karma plugin for testing with es modules

A CustomEvent polyfill for legacy browsers.

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 shim for the iFrame "srcdoc" attribute

A cross-browser ponyfill for File with a working constructor

An essential Map poorlyfill for legacy browsers.

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

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

WebGL2 API Polyfills for WebGL1 WebGLRenderingContext

⚡ include core-js polyfills when bundling with rollup

Polyfill for window.location.origin

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.

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

Custom Properties polyfill for IE11.

Polyfilled smooth scrolling behavior and helper function for Gatsby sites.

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

A simple SDP interoperability layer for Unified Plan/Plan B

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

importModule() is a polyfill of import().

ES spec-compliant String.prototype.padStart shim.

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

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

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

An HTML5 Blob implementation

Hyphenation for node and Polyfill for client-side hyphenation.

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

Helper for mounting Dom in unit tests

a polyfill for canvas getTransform, ellipse, resetTransform API

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

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

Element.matches Polyfill

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An AbortController Polyfill

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/).

Plugin for generating an html file with rollup

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

requestIdleCallback polyfill

native Blob interface support (polyfill)

ES7 spec-compliant String.prototype.padEnd shim.

Polyfill for Array.prototype.fill

Convert a file: URL to its path

innerHTML polyfill for SVGElement

new Event() polyfill

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

A polyfill for the `let` helper in Ember < 3.2

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

Polyfill for the proposed React context API

Array.from polyfill

requestVideoFrameCallback 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

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

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

simple polyfill to MessageChannel and MessagePort API

Retrieves the language information saved in window.navigator.languages in a backwards compatible way.

A polyfill for Object.getOwnPropertyDescriptors

webp image format polyfill for browsers

user-agent-based polyfill combinator

JS polyfill CSS property -webkit-line-clamp

CustomEvent ponyfill

Polyfill for DOM Geometry Interfaces Module Level 1

A polyfill for the spatial navigation

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

A spec-compliant as much as it could be, small, and tested ES6 Symbol implementation.

MediaRecorder ponyfill that records audio as mp3

Yet another requestAnimationFrame polyfill.

A polyfill for Ember.String.isHtmlSafe.

Essential polyfill for the web

Feature detection in the browser before loading polyfill using services like polyfill.io

Polyfill for object-fit and object-position CSS properties on video elements

A WebAssembly polyfill for the Barcode Detection API