Demo: CSS list-style-image

<ul class='custom-list'>
  <li>Item One</li>
  <li>Item Two</li>
  <li>Item Three</li>
</ul>

.custom-list {
  list-style-type: none;
  padding: 0;
  list-style-image: url('https://via.placeholder.com/15');
}

.custom-list li {
  padding-left: 20px;
  margin: 5px 0;
  background-image: url('https://via.placeholder.com/15');
  background-repeat: no-repeat;
  background-position: 0 5px;
}

// No JavaScript required for this demo