<u>

<p>
  You could use this element to highlight <u>speling</u> mistakes, so the writer
  can <u>corect</u> them.
</p>

p {
  margin: 0;
}

u {
  text-decoration: #f00 wavy underline;
}

<p>  <u class="spelling"></u>.</p>

u.spelling {
  text-decoration: red wavy underline;
}

<span class="underline">Today's Special</span>
<br />
Chicken Noodle Soup With Carrots

.underline {
  text-decoration: underline;
}

<p>The class read <cite>Moby Dick</cite> in the first term.</p>

cite {
  font-style: normal;
  text-decoration: underline;
}