FF 53.0.2 (64-bit), Chromium Version 58.0.3029.96 Built on Ubuntu , running on Ubuntu 16.04 (64-bit); using a big Dell in portrait mode. Screenshots: https://imgur.com/a/vFhNc By the time I've scrolled down far enough to activate the animation, the graph has disappeared.

ah I think it's due to the high viewport height that we didn't account for (it's rare, but in your case, it broke the code). thanks!

Like @Asdfbla, I'm on 2560x1440 and have the same issue. The viewport is likely the issue =)

I have the same problem on Firefox a 2560x1440 monitor. (Still very nice presentation though.)