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chromium/third_party/blink/web_tests/animations/web-animations/KeyframeEffect-animation.html 

<!DOCTYPE html>
<meta charset=utf-8>
<title>Animating with KeyframeEffect objects</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="resources/testcommon.js"></script>
<body>
<script>
"use strict";

test(function(t) {
  var target = createDiv(t);
  var effect = new KeyframeEffect(target, null);
  var anim = target.animate(null);
  anim.effect = effect;
  assert_class_string(anim.effect, "KeyframeEffect");
}, "An animation can be created with a KeyframeEffect, and the effect"
   + " is of the expected type");

test(function(t) {
  var target = createDiv(t);
  var effect = new KeyframeEffect(target, { opacity: [0, 0.9] }, 1000);
  var anim = target.animate(null);
  anim.pause();
  anim.effect = effect;
  anim.currentTime = 500;
  assert_equals(getComputedStyle(target).opacity, '0.45',
      'opacity at mid-point');
}, "An animation based on a KeyframeEffect applies an effect");

</script>
</body>