In JavaScript DOM, childNodes.length returns the number of both element and text nodes. Is there any way to count only the number of element-only child nodes?

For example, childNodes.length of div#posts will return 6, when I expected 2:

<div id=posts>

    <!-- some comment -->

    <!-- another comment -->

    <div>an element node</div>

    <!-- another comment -->

    <span>an element node</span>

    a text node

</div>