I don't know. I have seen the first title, scrolled to see the rest of the text, and the "slide" changed and I said, "It's a slideshow", then navigated away. From what I see:

    - Space, right arrow, down arrow and scrolling down: Next slide
    - Up arrow, left arrow, scrolling up: Previous slide

Makes sense. No?

100% agreed.

But at this point making user interfaces actively confusing in the name of minimalist aesthetics seems to be so popular among front-end developers that I'm not sure what to do about it aside from gripe, grumble, and accept that family members are going to continue needing to call me for computer help about twice as often as they used to.