Polyfills

Before

Flicking is based on es5 and additionally needs es6 Promise to work properly.
es5 is basically supported on IE9+ (Source)
So, only es6 Promise is needed to run Flicking on the older browsers.

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/es6-promise/dist/es6-promise.auto.js"></script>

Adding the above script will make Flicking run on the older browsers.

After

Flicking is based on es5 and additionally needs es6 Promise to work properly.
es5 is basically supported on IE9+ (Source)
So, only es6 Promise is needed to run Flicking on the older browsers.

• How to use it via CDN (For personal or internal use)

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/es6-promise/dist/es6-promise.auto.js"></script>

• How to use it yourself (Unlike individual or internal cases, CDN has unpredictable problems with services, so it is better to use your own files.)

# Download
https://cdn.jsdelivr.net/npm/es6-promise/dist/es6-promise.auto.js

• How to use it via module (The pollution of the global scope)

require('es6-promise').polyfill();

Adding the above script will make Flicking run on the older browsers.