Script

var toggle = new Toggle()

HTML

<button>Choose a Dessert</button>

<nav class="toggle">
  <ul>
    <li><a href="#">Pie</a></li>
    <li><a href="#">Cake</a></li>
    <li><a href="#">Ice Cream</a></li>
  </ul>
</nav>

CSS

/* Hide collapsed */
[aria-expanded="false"] {
  display: none;
}