File: updating-animation-on-pseudo-element.html

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<!DOCTYPE html>
<html class="reftest-wait">
<style>
@keyframes anim {
  from { margin-left: 10em; }
  to { margin-left: 10em; }
}
#target::before {
  content: 'before';
}
#target.anim::before {
  animation: anim 100s infinite;
  font-size: 10px;
}
#target.bigger-font::before {
  font-size: 20px;
}
</style>
<div id="target"></div>
<script>
addEventListener('DOMContentLoaded', () => {
  var target = document.getElementById('target');

  // Start an animation on pseudo element.
  target.classList.add('anim');

  requestAnimationFrame(() => {
    // The animation on pseudo element should be updated
    // when the target element classes are modified.
    target.classList.add('bigger-font');

    requestAnimationFrame(() => {
      document.documentElement.classList.remove('reftest-wait');
    });
  });
});
</script>
</html>