attribute-value-unaffected-by-animation-002.html

<!doctype html>
<title>An animation of an attribute ('orient') does not change the DOM attribute value</title>
<link rel="help" href="https://www.w3.org/TR/2001/REC-smil-animation-20010904/#BasicAnim">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg>
  <marker orient="90">
    <set attributeName="orient" to="auto"/>
  </rect>
</svg>
<script>
  async_test(t => {
    onload = t.step_func(() => {
      requestAnimationFrame(t.step_func_done(() => {
        let marker = document.querySelector('marker');
        marker.orientAngle.baseVal.valueInSpecifiedUnits = 180;
        assert_equals(marker.getAttribute('orient'), '180');
      }));
    });
  });
</script>

chromium/third_party/blink/web_tests/external/wpt/svg/animations/attribute-value-unaffected-by-animation-002.html