Tapping doesn't work on a macbook with tap to click. To see a menu I have to do a full click instead of a tap. In the several years I've had tap to click set I don't think I've ever run across a web page where tapping doesn't work like a click.

Navigation was quiet confusing to me on my Macbook as well. If the topic was not so interesting I would have left in complete frustration instead of deciding to fight the interface.