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chromium/third_party/blink/web_tests/svg/custom/animate-initial-pause-unpause.html 

<!DOCTYPE HTML>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<!--
    Test for WK89943: pausing and unpausing an animation before it starts should have no effect.
-->
<svg id="svg" width="400" height="400">
  <rect x="0" y="0" width="100" height="100" fill="red"/>
  <rect id="rect" x="100" y="0" width="100" height="100" fill="green">
    <set attributeName="x" to="0" begin="0.01s" fill="freeze"/>
  </rect>
</svg>
<script>
async_test(function(t) {
  const svg = document.getElementById("svg");
  svg.pauseAnimations();
  svg.unpauseAnimations();

  const rect = document.getElementById("rect");
  const setAnimation = rect.firstElementChild;
  setAnimation.onbegin = t.step_func_done(function() {
    assert_equals(rect.x.animVal.value, 0, "<set> is applied");
  });
}, "Pausing and unpausing an animation before it starts should have no effect");
</script>