RadioButtons in a TWebbrowser

procedure TForm1.Button1Click(Sender: TObject);
var
  Document: IHTMLDocument2;
  rbTestList: IHTMLElementCollection;
  rbTest: IHTMLOptionButtonElement;
  I: Integer;
begin
  // Get a reference to the document
  Document := WebBrowser1.Document as IHTMLDocument2;
 
  // Get a reference to input-control (Radiobutton)
  rbTestList := Document.all.item('rating', EmptyParam) as IHTMLElementCollection;
 
  // Get current values.
  for I := 0 to rbTestList.Length - 1 do
  begin
    // reference to the i. RadioButton
    rbTest := rbTestList.item(I, EmptyParam) as IHTMLOptionButtonElement;
 
    // Show a message if radiobutton is checked
    if rbTest.Checked then
      ShowMessageFmt('Der RadioButton mit dem Wert %s' +
        ' ist ausgewahlt!', [rbTest.Value]);
  end;
 
  // Set new values
  for I := 0 to rbTestList.Length - 1 do
  begin
    // reference to the i. RadioButton
    rbTest := rbTestList.item(I, EmptyParam) as IHTMLOptionButtonElement;
 
    // check radiobutton with value 3.
    if rbTest.Value = '3' then
      rbTest.Checked := True;
  end;
end;

Взято с сайта https://www.swissdelphicenter.ch/en/tipsindex.php