How do I find the vertical position of tags using .net webbrowser control?

Question

I need to traverse through an HTML document and detect the position of each tag so I can insert HTML elements when I reach specific positions, such as the bottom of a page (9x11 paper)

I am using the .NET web browser control. I cannot seem to get the code to figure out my current position. OffsetRectangle is dependent on the parent node position which is tripping my up. This is what I have so far:

Using wb As WebBrowser = wf.WebBrowser
    wb.Navigate("about:blank")
    wb.Document.Write(My.Computer.FileSystem.ReadAllText("D:\Temp\Base.html"))


    Dim children As HtmlElementCollection = wb.Document.All
    Dim currentPosition As Integer = 0

    For Each child As HtmlElement In children

        currentPosition += child.OffsetRectangle.Top
        If currentPosition > pagebottom Then
            Stop
        End If
    Next
End using

How can I loop through every html tag and always know where I am verticaly?