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Test Info:

<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.effect</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../testcommon.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';
test(t => {
const anim = new Animation();
assert_equals(anim.effect, null, 'initial effect is null');
const newEffect = new KeyframeEffect(createDiv(t), null);
anim.effect = newEffect;
assert_equals(anim.effect, newEffect, 'new effect is set');
}, 'effect is set correctly.');
test(t => {
const div = createDiv(t);
const animation = div.animate({ left: ['100px', '100px'] },
{ fill: 'forwards' });
const effect = animation.effect;
assert_equals(getComputedStyle(div).left, '100px',
'animation is initially having an effect');
animation.effect = null;
assert_equals(getComputedStyle(div).left, 'auto',
'animation no longer has an effect');
animation.effect = effect;
assert_equals(getComputedStyle(div).left, '100px',
'animation has an effect again');
}, 'Clearing and setting Animation.effect should update the computed style'
+ ' of the target element');
</script>
</body>