1. Whatwg UrlAn implementation of the WHATWG URL Standard in JavaScript
2. CssstyleA Node.js implementation of the CSS Object Model CSSStyleDeclaration interface
3. Webidl2jsAuto-generate JS class structures for Web IDL specifications
4. JsdomA JavaScript implementation of various web standards, for use with Node.js
9. ababPerfectly spec-compliant atob and btoa implementations
11. whatwg-mimetypeParses, serializes, and manipulates MIME types, according to the WHATWG MIME Sniffing Standard
12. js-symbol-treeTurn any collection of objects into its own efficient tree or linked list using Symbol