Dim webDocument As New HtmlAgilityPack.HtmlDocument
Dim elements As HtmlAgilityPack.HtmlNodeCollection
 
webDocument.LoadHtml(WebBrowser1.DocumentText)
elements = webDocument.DocumentNode.SelectNodes("//input/@value")
 
If elements IsNot Nothing Then
    For Each el In elements
        Debug.WriteLine(el.GetAttributeValue("value", ""))
    Next
End If