:link

p {
  font-weight: bold;
}

a:link {
  color: forestgreen;
  text-decoration-color: hotpink;
}

<p>Pages that you might have visited:</p>
<ul>
  <li>
    <a href="https://developer.mozilla.org">MDN Web Docs</a>
  </li>
  <li>
    <a href="https://www.youtube.com/">YouTube</a>
  </li>
</ul>
<p>Pages unlikely to be in your history:</p>
<ul>
  <li>
    <a href="https://developer.mozilla.org/missing-2">Random MDN page</a>
  </li>
  <li>
    <a href="https://example.com/missing-2">Random Example page</a>
  </li>
</ul>

:link {
  /* ... */
}

<a href="#ordinary-target">This is an ordinary link.</a><br />
<a href="">You've already visited this link.</a><br />
<a>Placeholder link (won't get styled)</a>

a:link {
  background-color: gold;
  color: green;
}