C#

using System;
using System.Drawing;
using System.Windows.Forms;
using DotNetBrowser.DOM;
using DotNetBrowser.WinForms;

namespace NodeAtPoint
{
    public partial class Form1 : Form
    {
        private WinFormsBrowserView browserView;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            browserView = new WinFormsBrowserView {Dock = DockStyle.Fill};
            Controls.Add(browserView);
            browserView.MouseDown += BrowserViewOnMouseDown;
            browserView.Browser.LoadURL("google.com");
        }

        private void BrowserViewOnMouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                Point point = new Point(e.X, e.Y);
                DOMNodeAtPoint nodeAtPoint = browserView.Browser.NodeAtPoint(point);
                MessageBox.Show(nodeAtPoint.Node.NodeName);
            }
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            browserView.Dispose();
        }
    }
}

VB.NET

Imports DotNetBrowser.DOM
Imports DotNetBrowser.WinForms

Public Class Form1
    Private Dim _browserView As WinFormsBrowserView

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        _browserView = new WinFormsBrowserView()
        _browserView.Dock = DockStyle.Fill
        Controls.Add(_browserView)
        AddHandler _browserView.MouseDown, AddressOf BrowserViewMouseDown
        _browserView.Browser.LoadURL("google.com")
    End Sub

    Private Sub BrowserViewMouseDown(sender As Object, e As MouseEventArgs)
        If e.Button = MouseButtons.Left Then
            Dim point = New Point(e.X, e.Y)
            Dim domNodeAtPoint As DOMNodeAtPoint = _browserView.Browser.NodeAtPoint(point)
            MessageBox.Show(domNodeAtPoint.Node.NodeName)
        End If
    End Sub

    Private Sub Form1_FormClosed(sender As Object, e As FormClosedEventArgs) Handles MyBase.FormClosed
        _browserView.Dispose()
    End Sub
End Class