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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Animation with neutral keyframe is responsive to change in underlying style</title>
<link rel="match" href="neutral-keyframe-ref.html">
<script src="/common/reftest-wait.js"></script>
<script src="/web-animations/testcommon.js"></script>
<style type="text/css">
#block {
background-color: green;
height: 100px;
width: 100px;
<div id="block"></div>
window.onload = async () => {
const target = document.getElementById('block');
const anim = target.animate({ translate: '200px' },
duration: 10000,
easing: 'steps(1,jump-end)'
await anim.ready;
await waitForNextFrame();
// The neutral keyframe value changes from transform 'none' to '100px'.
// Since using jump-end for the easing function, the animated value is the
// underlying (neutral) value. If the box is not translated, then the change
// to the underlying value is not taking effect. = '100px';
await waitForNextFrame();