How to Paste, Undo, Redo and SelectAll in TWebBrowser

uses
  ActiveX;

// Paste the text from the clipboard

procedure TForm1.Button1Click(Sender: TObject);
begin
  try
    WebBrowser1.ExecWB(OLECMDID_PASTE, OLECMDEXECOPT_PROMPTUSER);
  except
  end;
end;


// Undo

procedure TForm1.Button2Click(Sender: TObject);
begin
  try
    WebBrowser1.ExecWB(OLECMDID_UNDO, OLECMDEXECOPT_PROMPTUSER);
  except
  end;
end;

// Redo

procedure TForm1.Button3Click(Sender: TObject);
begin
  try
    WebBrowser1.ExecWB(OLECMDID_REDO, OLECMDEXECOPT_PROMPTUSER);
  except
  end;
end;


// Select all

procedure TForm1.Button4Click(Sender: TObject);
begin
  try
    WebBrowser1.ExecWB(OLECMDID_SELECTALL, OLECMDEXECOPT_PROMPTUSER);
  except
  end;
end;


initialization
  OleInitialize(nil);

finalization
  OleUninitialize;
end.

// as of Internet Explorer 4