<body>
<svg width="100" height="3000" stroke="red" stroke-width="5">
  <svg>
    <path id="line" d="M 50 0 V 3000"></path>
  </svg>
</svg>
<div class="spacer"></div>
</body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script>
  promise_test(async t => {
    const scroller = document.scrollingElement;
    const target = document.getElementById('line');
    const anim = target.getAnimations()[0