From the blog that another reply linked (https://acko.net/blog/zero-to-sixty-in-one-second/) 'Rather than try and emulate some of the bling for CSS 3D-only environments, it's all or nothing. Without WebGL, you get plain images.' Although this blog post is from 2013, so who knows if this is the actual reason. Thankfully, the blog post also links to a video so you can still view it: https://www.youtube.com/watch?v=zjwA1VmuPnw

10 years ago, having a showy webgl demo on a blog post, on mobile phones, would result in complaints on HN.

Nowadays people complain they can't see the WebGL on their phone.

I guess that's progress?

Progress for sure, that iPhone can do all the flashy webgl in the world and not break a sweat, those things have kick ass processors.

The iPad does present itself as Mac useragent now, so I think it is deliberately targeting iOS devices and the iPad doesn't match that anymore. Even when I sized the split screen down to a narrow column it still gives me the full version.