<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="descendants" style="width:500px;">div (current element)
<p>p (child)
<span>span (grandchild)</span>
</p>
<p>p (child)
<span>span (grandchild)</span>
</p>
</div>
<div class="descendants-any-one" style="width:500px;">div (current element)
<p class="1">p (child)
<span>span (grandchild)</span>
</p>
<p class="2">p (child)
<span>span (grandchild)</span>
</p>
</div>