<style>
div {
  width: 100px;
  background-color: blue;
  font-family: Ahem;
  font-size: 20px;
  color: green;
}

span {
  display: inline-block;
  width: 100px;
  height: 90px;
  background-color: green;
}
</style>
<!-- overflowing content should not trigger legacy's "do not trim trailing whitespace" mode -->
<div><span></span>
<br>XXXXX</div>