This is standard checkbox from model forms:
In my HTML I have: {{form}}
In website source:
<div class="id_accept-control-group control-group">
   <div class="controls">
      <label class="checkbox">
      <input type="checkbox" name="accept" id="id_accept" /> <span>Accept</span>
      </label>
   </div>
</div>
How to add custom attribute: disabled="disabled" checked="checked" (to input)?