#polyfill

The cross-browser extension framework.

Comprehensive TypeScript/JavaScript utility library with cross-environment support (Node.js, browser, web worker) providing helper functions, polyfills (ES5-ES2023), type checking utilities, and optimized implementations for better minification and code readability.

Polyfill for CSS Anchor Positioning

Standard Library

Polyfills the HTML popover attribute and showPopover/hidePopover/togglePopover methods onto HTMLElement, as well as the popovertarget and popovertargetaction attributes on <button> elements.

Rust WebTransport library for native and WASM

PHP polyfills

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

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

A Barcode Detection API ponyfill/polyfill that uses ZXing-C++ WebAssembly under the hood.

Provides a set of backward compatible `throw` helper methods, which have been added in previous .NET versions.

A Nuxt module for supporting legacy browsers.