js element has transform, how to animate code example

Example 1: javascript animate elements

document.getElementById("tunnel").animate([
  // keyframes
  { transform: 'translateY(0px)' },
  { transform: 'translateY(-300px)' }
], {
  // timing options
  duration: 1000,
  iterations: Infinity
});

Example 2: js keyframe

var  ondersteundFlag  =  $ . sleutelframe . isSupported ( ) ;