Polyfill - Cross-Browser Support for JavaScript Projects (Support upto IE 8+) using React & Core JS

A polyfill is a piece of code used to provide modern functionality on older browsers that do not natively support it. That is Cross-browser compatibility for

ecmascript 6 - Javascript: dealing with constants and cross-browser compatibility - Stack Overflow

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Using polyfill.io

Polyfills in React Application: A Complete Guide - DEV Community

Test Polyfills Better world by better software

Polyfill - Cross-Browser Support for JavaScript Projects (Support upto IE 8+) using React & Core JS

How Polyfill Works in Babel. Understand how polyfill works in your…, by Manato Kuroda

Polyfills: everything you ever wanted to know, or maybe a bit less, by David Gilbertson