Font Awesome 5.0.0 SVG

HTML

<script src="https://use.fontawesome.com/releases/v5.0.0/js/all.js"></script>
<ul class="fa-ul" >
  <li>
    <span class="fa-li">
      <i class="far fa-square"></i>
    </span>
    Primeiro Item
  </li>
  <li>
    <span class="fa-li">
      <i class="fas fa-check-square"></i>
    </span>
    Segundo Item
  </li>
  <li>
    <span class="fa-li">
      <i class="fas fa-sitemap"></i>
    </span>
    Terceiro Item
  </li>
</ul>

CSS

body {
  font-size: 16px;
}