<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-text-4/#valdef-text-wrap-balance">
<link rel="match" href="reference/text-wrap-balance-dynamic-001-ref.html">
<style>
#container {
  width: 20ch;
  text-wrap: balance;
}
span:hover {
  color: red;
}
</style>
<div id="container">
  123 567 901 345 789
  123 567 901 345 789
  123 567 901 345 789
</div>
<script>
document.body.offsetTop;
container.appendChild(document.createTextNode('999'));
</script>
