Torna al Thread
public void Form1_Load(object sender, EventArgs e)
{
input_html.DocumentText = "<html><body></body></html>";
doc = input_html.Document.DomDocument as IHTMLDocument2;
doc.designMode = "On";
input_html.Document.Focusing += new System.Windows.Forms.HtmlElementEventHandler(input_html_Focusing);
// doc.onbeforeupdate
}