<!DOCTYPE html>
<style>
div {
  text-decoration: underline;
}
span {
  text-decoration: underline;
  display: block;
}
</style>
<div>
  From EXAMPLE 1 of the spec.
</div>
<span>
  This text is also underlined,
  as it is in an in-flow block to which the underline is propagated.
</span>
