Put the product itself aside, that home page is wried.
In the "Examples" section, every <video> is nested in a <a>.
Because of that, I can't play any demo by directly click the play icon (Even one on the control bar) at least on Firefox.
Luckily my cat told me that I can just right click on that demo and select play on the pop menu. Otherwise I could never see those demos in my entire life and just close that page instead.