Alternatives and similar repositories for polyfills

Users that are interested in polyfills are comparing it to the libraries listed below

• webcomponents / custom-elements-everywhere
  Custom Element + Framework Interoperability Tests.
  ☆1,242Updated last week
• WICG / import-maps
  Former home of import maps (now merged into HTML)
  ☆2,726Updated 9 months ago
• open-wc / open-wc
  Open Web Components: guides, tools and libraries for developing web components.
  ☆2,374Updated 4 months ago
• guybedford / es-module-shims
  Shims for new ES modules features on top of the basic modules support in browsers
  ☆1,704Updated 2 weeks ago
• webcomponents / custom-elements
  A polyfill for HTML Custom Elements v1
  ☆456Updated 6 years ago
• csstree / csstree
  A tool set for CSS including fast detailed parser, walker, generator and lexer based on W3C specs and browser implementations
  ☆2,061Updated 7 months ago
• rollup / rollup-starter-app
  Bare-bones example of how to create an application using Rollup
  ☆445Updated 2 years ago
• GoogleChromeLabs / page-lifecycle
  PageLifecycle.js is a tiny JavaScript library that allows developers to easily observe Page Lifecycle API state changes cross browser
  ☆833Updated 2 years ago
• GoogleChrome / proxy-polyfill
  Proxy object polyfill
  ☆1,146Updated last year
• adobe / spectrum-web-components
  Spectrum Web Components
  ☆1,458Updated this week
• GoogleChromeLabs / tooling.report
  tooling.report a quick way to determine the best build tool for your next web project, or if tooling migration is worth it, or how to ado…
  ☆854Updated last month
• lit / lit-element-starter-ts
  Sample component project using LitElement with TypeScript
  ☆528Updated 4 months ago
• WICG / portals
  A proposal for enabling seamless navigations between sites or pages
  ☆952Updated last year
• vaadin / router
  Small and powerful client-side router for Web Components. Framework-agnostic.
  ☆452Updated last month
• browserslist / caniuse-lite
  A smaller version of caniuse-db, with only the essentials!
  ☆599Updated last week
• rollup / rollup-starter-lib
  Bare-bones example of how to create a library using Rollup
  ☆994Updated 2 years ago
• modernweb-dev / web
  Guides, tools and libraries for modern web development.
  ☆2,393Updated 2 weeks ago
• runem / web-component-analyzer
  CLI that analyzes web components and emits documentation
  ☆514Updated 2 years ago
• mdn / web-components-examples
  A series of web components examples, related to the MDN web components documentation at https://developer.mozilla.org/en-US/docs/Web/Web_…
  ☆3,339Updated last month
• csstools / postcss-preset-env
  Convert modern CSS into something browsers understand
  ☆2,208Updated 2 years ago
• mdn / sw-test
  Service Worker test repository. This is a very simple demo to show basic service worker features in action.
  ☆754Updated 3 years ago
• ampproject / worker-dom
  The same DOM API and Frameworks you know, but in a Web Worker.
  ☆3,251Updated last month
• lit / lit-element
  LEGACY REPO. This repository is for maintenance of the legacy LitElement library. The LitElement base class is now part of the Lit librar…
  ☆4,489Updated this week
• webcomponents / webcomponents.org
  Home of the web components community
  ☆382Updated last month
• web-padawan / awesome-lit
  A curated list of awesome Lit resources.
  ☆1,668Updated last month
• jhildenbiddle / css-vars-ponyfill
  Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers
  ☆1,464Updated last year
• bublejs / buble
  ☆876Updated 2 years ago
• webpack / enhanced-resolve
  Offers an async require.resolve function. It's highly configurable.
  ☆975Updated last week
• rollup / plugins
  🍣 The one-stop shop for official Rollup plugins
  ☆3,745Updated last month
• elix / elix
  High-quality, customizable web components for common user interface patterns
  ☆833Updated 2 years ago