repeatcount-attribute-mutation.html

<!doctype html>
<title>Mutating the 'repeatCount' attribute after the element has been inserted</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg height="0">
  <rect width="10" height="100" fill="blue">
    <animate id="anim" attributeName="width" from="10" to="100" dur="10ms"
             repeatCount="indefinite"/>
  </rect>
</svg>
<script>
  promise_test(t => {
    const anim = document.getElementById("anim");
    anim.removeAttribute('repeatCount');

    const watcher = new EventWatcher(t, anim, ['endEvent', 'repeatEvent']);
    return watcher.wait_for('endEvent');
  });
</script>

chromium/third_party/blink/web_tests/external/wpt/svg/animations/repeatcount-attribute-mutation.html