Ну не знаю...
Delphi 7, Win 7 (IE 11) - работает:
Код:
uses MSHTML, ActiveX;
procedure TForm1.Button1Click(Sender: TObject);
begin
WebBrowser1.Navigate('http://www.delphisources.ru');
end;
procedure TForm1.Button2Click(Sender: TObject);
var
Doc : IHtmlDocument2;
begin
Doc := WebBrowser1.Document as IHtmlDocument2;
Memo1.Lines.Text := Doc.body.innerHTML;
end;