`animate` function

To fully control your animation, run `animate` function

import {Animation, animate} from 'animations.js';
const el = document.querySelector('.target');

animate(
  1000,                                     // DURATION
  function(t) { return Math.pow(t, 1.675) } // timing function
  function(timing, pct) { el.style.opacity = pct  } // draw function  
).then(function() {
  el.removeAttribute('style')
});