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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>
  <div id="target"></div>
  <div id="target2"></div>
  <p>animation: name result: <span id="log"></span></p>
  <p>animation-name: name result: <span id="log2"></span></p>
</body>
</html>
 
@keyframes foo {
  0% { opacity: 0; }
  100% {opacity: 1; }
}
​
#target, #target2 {
  width: 50px;
  height: 50px;
  background: green;
}
​
#target {
  animation: foo;
  animation-fill-mode: forwards;
}
​
#target2 {
  animation-name: foo;
  animation-fill-mode: forwards;
}
 
function $(id) {
  return document.getElementById(id);
}
​
function test(elem) {
  anims = elem.getAnimations();
  if (anims.length == 0) {
    return 'No animation'
  }
  return `getTiming() duration = ${anims[0].effect.getTiming().duration} getComputedStyle duration = ${getComputedStyle(elem).animationDuration}`;
}
​
$('log').textContent = test($('target'));
$('log2').textContent = test($('target2'));
$('log3').textContent = test($('target3'));
Output

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