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chromium/third_party/blink/web_tests/external/wpt/svg/animations/animate-reset-freeze.html 

<!doctype html>
<title>SVG Animations: Rewinding fill='freeze' animations</title>
<link rel="help" href="https://svgwg.org/specs/animations/">
<link rel="issue" href="https://bugs.webkit.org/show_bug.cgi?id=89846">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg>
  <rect width="100" height="100" fill="red"/>
  <rect id="rect" x="0" width="100" height="100" fill="green">
    <set attributeName="x" to="100" begin="4s" fill="freeze"/>
    <set attributeName="x" to="200" begin="1s" dur="1s" fill="freeze"/>
  </rect>
</svg>
<script>
  async_test(t => {
    let svg = document.querySelector('svg');
    let rect = document.getElementById('rect');
    svg.pauseAnimations();
    svg.setCurrentTime(100);

    window.onload = t.step_func(() => {
      window.requestAnimationFrame(t.step_func_done(() => {
        assert_equals(rect.x.animVal.value, 100, "'x' is 100 at t=100");
        svg.setCurrentTime(0);
        assert_equals(rect.x.animVal.value, 0, "'x' is 0 at t=0");
      }));
    });
  });
</script>