Rechercher et marquer du texte dans un TWebBrowser

private
procedure SearchAndHighlightText(aText: string);

{....}

procedure TForm1.SearchAndHighlightText(aText: string);
var
i: Integer;
begin
for i := 0 to WebBrowser1.OleObject.Document.All.Length - 1 do
begin
if Pos(aText, WebBrowser1.OleObject.Document.All.Item(i).InnerText) <> 0 then
begin
WebBrowser1.OleObject.Document.All.Item(i).Style.Color := '#FFFF00';
WebBrowser1.OleObject.Document.All.Item(i).ScrollIntoView(True);
end;
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
SearchAndHighlightText('some text...');
end;