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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <a href="#">click me</a>
​
<h3>We are gonna be animated</h3>
  <h3>We are gonna be animated</h3>
  <h3>We are gonna be animated</h3>
  <h3>We are gonna be animated</h3>
  <h3>We are gonna be animated</h3>
  <h3>We are gonna be animated</h3>
</body>
</html>
 
function animate (el, animationName, durationMs) {
  return new Promise(res => {
    
    const fn = e => {
      if (!e.target.isEqualNode(el) || e.animationName !== animationName) return;
      el.removeEventListener('animationend', fn)
      el.removeEventListener('webkitAnimationEnd', fn)
      el.style.animationDuration = ''
      el.style.webkitAnimationDuration = ''
      el.style.animationName = ''
      el.style.webkitAnimationName = ''
      res(el)
    }
    
    el.addEventListener('animationend', fn)
    el.addEventListener('webkitAnimationEnd', fn)
    el.style.animationDuration = durationMs + 'ms'
    el.style.webkitAnimationDuration = durationMs + 'ms'
    el.style.animationName = animationName
    el.style.webkitAnimationName = animationName
    
  })
}
​
document.querySelector('a').addEventListener('click', e => {
  
  let queue = Promise.resolve()
  for (let h3 of document.querySelectorAll('h3')) {
    queue = queue.then(() => animate(h3, 'pulse', 1000))
  }
  queue = queue.then(() => alert('done'))
  
})
Output

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