how to set animation in js code example

Example 1: js add animation to element

let rotate360 = [
  { transform: 'rotate(360deg)' }
];

Example 2: js add animation to element

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

Example 3: js add animation to element

var animation = element.animate(keyframes, options);