Since many of the Web standards polyfills require ES5 or ES2015 support, a bundle is provided that includes nearly everything.
polyfill.js is a concatenation of the following files:
es5.js - ECMAScript 5 polyfills es6.js - ECMAScript 2015 polyfills web.js (which is itself a concatenation of files)
polyfill.min.js is a minimized version, c/o http://javascript-minifier.com