Заполнение полей формы в TWebBrowser методом Drag & Drop

{ 
  This example shows how to fill out fields in your webbrowser by 
  dragging the content of Label1 to a field of your webbrowser}
 
 
 
 procedure TForm1.FormCreate(Sender: TObject);
 begin
   label1.DragMode := dmAutomatic;
 end;
 
 
 procedure TForm1.WebBrowserDragOver(Sender, Source: TObject; X,
   Y: Integer; State: TDragState; var Accept: Boolean);
 var
   item: Variant;
 begin
   //check if document is interactive 
  if (Webbrowser.ReadyState and READYSTATE_INTERACTIVE) = 3 then
   begin
     item := WebBrowser.OleObject.Document.elementFromPoint(x, y);
     if Source is TLabel then
       Accept := True;
     Accept := (item.tagname = 'INPUT') and ((item.type = 'text') or
       (item.type = 'password')) or (item.tagname = 'TEXTAREA');
   end;
 end;
 
 procedure TForm1.WebBrowserDragDrop(Sender, Source: TObject; X,
   Y: Integer);
 var
   item: Variant;
 begin
   //check if document is interactive 
  if (Webbrowser.ReadyState and READYSTATE_INTERACTIVE) = 3 then
   begin
     item       := WebBrowser.OleObject.Document.elementFromPoint(x, y);
     item.Value := label1.Caption;
   end;
 end;

Взято с сайта: https://www.swissdelphicenter.ch