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<!DOCTYPE html>
<html class="reftest-wait reftest-no-flush">
<style>
#target {
  background-color: green;
  width: 100px;
  height: 100px;
  transition: background-color 100s steps(1, end);
  opacity: 0.5;
}
#target.hover {
  background-color: white;
}
</style>
<div id="target"></div>
<script>
document.addEventListener('MozReftestInvalidate', () => {
  target.className = 'hover';
  target.addEventListener('transitionstart', () => {
    document.documentElement.classList.remove('reftest-wait');
  });
}, false);
</script>
</html>