Convert CSS cubic bezier easing to Javascript

There is library for Bezier Curve based easing in JavaScript https://github.com/gre/bezier-easing

You could just select desired parameters from http://cubic-bezier.com and pass them to function BezierEasing. For example:

BezierEasing(0.25, 0.1, 0.0, 1.0)

Here is a example from documentation:

https://jsfiddle.net/0x51ew2L/