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chromium/third_party/blink/web_tests/external/wpt/svg/animations/animate-stop-currentcolor.html 

<!doctype html>
<title>Animating 'stop-color' from 'currentcolor'</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg>
  <linearGradient id="lg" style="color: green">
    <stop stop-color="red">
      <animate attributeName="stop-color" from="currentcolor" to="green" dur="10s" fill="freeze"/>
    </stop>
  </linearGradient>
  <rect width="100" height="100" fill="url(#lg)"/>
</svg>
<script>
  async_test(t => {
    let svg = document.querySelector("svg");
    svg.pauseAnimations();
    svg.setCurrentTime(5);
    onload = t.step_func(() => {
      requestAnimationFrame(t.step_func_done(() => {
        let stop = document.querySelector("stop");
        assert_equals(getComputedStyle(stop).getPropertyValue("stop-color"),
                      "rgb(0, 128, 0)");
      }));
    });
  });
</script>