set animation with javascript code example

Example 1: start animation with javascript

element.addEventListener("click", function(e){
  element.classList.remove("anim");
  setTimeout(() => element.classList.add("anim"), 0);
}, false);

Example 2: js add animation to element

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