<!DOCTYPE html>
<style>
div {
  font-size: 10px;
  width: 12ch;
  line-height: 1;
  background: yellow;
}
.float {
  width: 12ch;
  height: 1em;
  background: orange;
}
</style>

<body>
<div>
  1111<br>
  2222 3333
  <div class="float"></div>
</div>

</body>
