<p>“You're late!”</p>
<del>
  <p>“I apologize for the delay.”</p>
</del>
<ins cite="../howtobeawizard.html" datetime="2018-05">
  <p>“A wizard is never late …”</p>
</ins>

del,
ins {
  display: block;
  text-decoration: none;
  position: relative;
}

del {
  background-color: #fbb;
}

ins {
  background-color: #d4fcbc;
}

del::before,
ins::before {
  position: absolute;
  left: 0.5rem;
  font-family: monospace;
}

del::before {
  content: '−';
}

ins::before {
  content: '+';
}

p {
  margin: 0 1.8rem 0;
  font-family: Georgia, serif;
  font-size: 1rem;
}