<!doctype html>
<meta charset=utf-8>
<title>KeyframeEffect.iterationComposite</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-keyframeeffect-iterationcomposite">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src="../../testcommon.js"></script>
<div id="log"></div>
<script>
'use strict';

test(t => {
  const div = createDiv(t);
  const anim = div.animate({ marginLeft: ['0px', '10px'] },
                           { duration: 100 * MS_PER_SEC,
                             easing: 'linear',
                             iterations: 10,
                             iterationComposite: 'accumulate' });
  anim.pause();

  anim.currentTime =
    anim.effect.getComputedTiming().duration * 2 +
    anim.effect.getComputedTiming().duration / 2;
  assert_equals(getComputedStyle(div).marginLeft, '25px',
    'Animated style at 50s of the third iteration');

  anim.effect.iterationComposite = 'replace';
  assert_equals(getComputedStyle(div).marginLeft, '5px',
    'Animated style at 50s of the third iteration');

  anim.effect.iterationComposite = 'accumulate';
  assert_equals(getComputedStyle(div).marginLeft, '25px',
    'Animated style at 50s of the third iteration');
}, 'iterationComposite can be updated while an animation is in progress');

</script>