<!DOCTYPE html>
<html>
<style>
@keyframes anim {
from { content: ''; }
to { content: 'content'; }
}
#target::marker {
content: 'initial';
animation: anim 100s linear -50s paused;
}
#target {
display: list-item;
margin-left: 200px;
}
</style>
<div id='target'></div>
</html>