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+<!DOCTYPE html>
+<title>Cancel non accelerated property using worklet animation</title>
+<link rel="help" href="https://drafts.css-houdini.org/css-animationworklet/">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/web-animations/testcommon.js"></script>
+<script src="common.js"></script>
+
+<style>
+#target {
+ background-color: red;
+}
+</style>
+
+<div id="target"></div>
+
+<script>
+ promise_test(async t => {
+ await registerConstantLocalTimeAnimator(1000);
+ const target = document.getElementById('target');
+ const effect = new KeyframeEffect(
+ target,
+ [
+ { background: 'green' },
+ { background: 'blue' },
+ ],
+ {
+ duration: 2000,
+ iteration: Infinity
+ }
+ );
+ const animation = new WorkletAnimation('constant_time', effect);
+ animation.play();
+
+ await waitForAsyncAnimationFrames(1);
+ // establish that the animation started
+ assert_equals(getComputedStyle(target).backgroundColor, "rgb(0, 64, 128)");
+ animation.cancel();
+
+ await waitForAsyncAnimationFrames(1);
+ // confirm the animation is cancelled
+ assert_equals(getComputedStyle(target).backgroundColor, "rgb(255, 0, 0)");
+ }, "Animation should update the outputs after starting and then return to pre-animated values after being cancelled");
+</script> \ No newline at end of file