Polyfill Open Source Projects

A window.fetch JavaScript polyfill.

Standard Library

Functional programming in TypeScript

A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)

History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. Supports jQuery, MooTools and Prototype. For HTML5 browsers this means that you can modify the URL directly, without needing to use hashes anymore. For HTML4 browsers it will revert back to using the old onhashchange functionality.

A responsive image polyfill for <picture>, srcset, sizes, and more

Essential metrics for a healthy site.

PHP 5.x support for random_bytes() and random_int()

Symfony polyfill for the Mbstring extension

Automatic polyfill service.

ECMAScript 5 compatibility shims for legacy (and modern) JavaScript engines

Isomorphic WHATWG Fetch API, for Node & Browserify

Javascript URL mutation library

🐕 Bare minimum 500b fetch polyfill.

Fast animations with javascript and CSS transforms

Promise packages, patterns, chat, and tutorials

Store HTML form submissions in Google Sheets.

Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions

A Javascript library for working with native objects.

Webfont loading. Simple, small, and efficient.

A CSS preprocessor that acts like a polyfill for future versions of the spec.

Symfony polyfill for ctype functions

An unofficial bilibili client for mac

Scroll Behavior polyfill

JavaScript implementation of the Web Animations API

Shim to insulate apps from spec changes and prefix differences. Latest adapter.js release:

Provides standard objects and functions for working with dates and times.

Threading for PHP - Share Nothing, Do Everything :)

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

Check the browser compatibility of your code

A lightweight polyfill library for Promise-based WebExtension APIs in Chrome

:point_down::boom: JavaScript library for handling Force Touch, 3D Touch, and Pointer Pressure.

PHP polyfills

A project committed to making file access and data transfer easier, efficient for React Native developers.

Symfony polyfill for intl's ICU-related data and classes

Polyfill for the HTML dialog element

OpenID Connect (OIDC) and OAuth2 protocol support for browser-based JavaScript applications

Symfony polyfill backporting some PHP 7.3+ features to lower PHP versions

matchMedia polyfill for testing media queries in JS

🏗️ Automatically move a module into a Web Worker (Webpack loader)

Polyfill for CSS `position: sticky`

jQuery contextMenu plugin & polyfill

a polyfill for http://www.w3.org/TR/eventsource/

🎚 HTML5 input range slider element jQuery polyfill

Lightweight ES6 Promise polyfill for the browser and node. A+ Compliant

Beautiful UI components build with vue and ant design

Symfony polyfill for intl's Normalizer class and related functions

📱 Make videos playable inline on the iPhone (prevents automatic fullscreen)

🗻 Polyfill object-fit/object-position on <img>: IE9, IE10, IE11, Edge, Safari, ...

:satellite: BroadcastChannel to send data between different browser-tabs or nodejs-processes :satellite: + LeaderElection over the channels https://pubkey.github.io/broadcast-channel/

A polyfill for the Resize Observer API

Symfony polyfill for intl's grapheme_* functions

Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions

Image compression in web browser

Universal WHATWG Fetch API for Node, Browsers and React Native.

Compatibility implementation of the ECMAScript Internationalization API (ECMA-402) for JavaScript -- UNMAINTAINED

Polyfill for `:focus-visible`

This component provides functions unavailable in releases prior to PHP 5.6.

Themes for Windows Terminal

EQCSS is a CSS Reprocessor that introduces Element Queries, Scoped CSS, a Parent selector, and responsive JavaScript to all browsers IE8 and up