Usage example:

```html
<ol class="sortable">
    <li class="mjs-nestedSortable-expanded"><div>Starts open, overriding default</div></li>
    <li class="mjs-nestedSortable-collapsed"><div>Starts collapsed, overriding default</div></li>
    <li><div>Starts open or closed based on startCollapsed setting; default behavior </div></li>
</ol>
```