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<!DOCTYPE HTML>
<html class="reftest-wait reftest-no-flush">
<style>
@keyframes anim {
  from { background-color: green; }
  to { background-color: red; }
}
#target {
  width: 100px;
  height: 100px;
  background-color: black;
}
</style>
<div id="target"></div>
<script>
document.addEventListener("MozReftestInvalidate", () => {
  target.style.animation = "anim 100s step-end reverse";
  target.addEventListener("animationstart", () => {
    document.documentElement.classList.remove("reftest-wait");
  });
});
</script>
</html>