DispDOMChildrenCollection

What is "DispDOMChildrenCollection"? It seems to be a function, but whatever it is, I can't use it the way I need to. I probably only need a DOMChildrenCollection object.

If this forum is not the most relevant for this question, then you can tell me which is.

The following is simplified sample code. In my full version, I do load a document into HTML. In the first sample below, the result of TypeName is DispDOMChildrenCollection. In the second sample below, I get the compile error "Argument not optional".

VB Code:

Dim HTML As MSHTML.IHTMLDocument
Set HTML = New MSHTML.HTMLDocument
Text1 = TypeName(HTML.documentElement.childNodes)

VB Code:

Dim HTML As MSHTML.IHTMLDocument
    Dim ChildrenCollection As DispDOMChildrenCollection
Set HTML = New MSHTML.HTMLDocument
' "Argument not optional" from the following
ChildrenCollection = HTML.documentElement.childNodes

Can I get at least a hint as to what DispDOMChildrenCollection is and where to look for documentation of it?

Also, if I use a Set for ChildrenCollection, I get "Type Mismatch".