Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  You can use the designMode property to put the Webbrowser 
  into a mode where you can edit the current document. 
}

 uses
   MSHTML_TLB;

 procedure TForm1.WebBrowser1DocumentComplete(Sender: TObject;
   const pDisp: IDispatch; var URL: OleVariant);
 var
   CurrentWB: IWebBrowser;
 begin
   CurrentWB := pDisp as IWebBrowser;
   (CurrentWB.Document as IHTMLDocument2).DesignMode := 'On';
 end;

 procedure TForm1.Button1Click(Sender: TObject);
 begin
   WebBrowser1.Navigate('http://wp.netscape.com/assist/net_sites/example1-F.html')
 end;