Скопировать, удалить, вставить в TWebBrowser

uses 
 ActiveX; 
 
// Copy the selected text to the clipboard 
procedure TForm1.Button7Click(Sender: TObject); 
begin 
  try 
    WebBrowser1.ExecWB(OLECMDID_COPY, OLECMDEXECOPT_PROMPTUSER); 
  except 
  end; 
end; 
 
// Cut the selected text 
procedure TForm1.Button8Click(Sender: TObject); 
begin 
  try 
    WebBrowser1.ExecWB(OLECMDID_CUT, OLECMDEXECOPT_PROMPTUSER); 
  except 
  end; 
end; 
 
// Delete the selected text 
procedure TForm1.Button9Click(Sender: TObject); 
begin 
  try 
    WebBrowser1.ExecWB(OLECMDID_DELETE, OLECMDEXECOPT_PROMPTUSER); 
  except 
  end; 
end; 
 
 
initialization 
  OleInitialize(nil); 
 
finalization 
  OleUninitialize; 
end. 
 
// as of Internet Explorer 4

Взято с https://delphiworld.narod.ru