zen-8.x-7.0-alpha15/STARTERKIT/components/base/forms/forms-input-checkbox.twig

<div>
  <label><input type="checkbox" class="{{modifier_class}}"> Check me out</label>
</div>

<div>
  <label><input type="checkbox" class="{{modifier_class}}" value="" disabled> Option two is disabled</label>
</div>