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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>
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