Jogar um arquivo html no webbrowser delphi

procedure TForm1.Button1Click(Sender: TObject);
var
  sHTML : AnsiString;
begin
  sHTML  := query1.fieldbyname('css').AsString+
            query1.fieldbyname('css2').AsString+
            query1.fieldbyname('css3').AsString+
            query1.fieldbyname('css4').AsString;
  WBLoadHTML(WebBrowser1,'');
end;

procedure tform1.WBLoadHTML(WebBrowser: TWebBrowser; HTMLCode: string) ;
var
   sl: TStringList;
   ms: TMemoryStream;
begin
   WebBrowser.Navigate('about:blank') ;
   while WebBrowser.ReadyState < READYSTATE_INTERACTIVE do
    Application.ProcessMessages;

   if Assigned(WebBrowser.Document) then
   begin
     sl := TStringList.Create;
     try 
       ms := TMemoryStream.Create;
       try
         sl.Text := HTMLCode;
         sl.SaveToStream(ms) ;
         ms.Seek(0, 0) ;
         (WebBrowser.Document as IPersistStreamInit).Load(TStreamAdapter.Create(ms)) ;
       finally
         ms.Free;
       end;
     finally
       sl.Free;
     end;
   end;
end;

WebBrowser.Navigate('about:blank') ;