<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.clamp {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  font: 16px / 32px monospace;
  white-space: pre;
  padding: 0 4px;
  background-color: yellow;
  width: 11ch;
}
.float {
  float: right;
  color: orange;
}
</style>
<div class="clamp"><div><div class="float">[f]</div>A B C D…</div>