Hm. Either that page or the tech itself is not great on mobile.
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I love tikz, but lightweight it is not; it’s not a huge surprise it takes a few seconds to render.
No idea what’s causing the crash, though.
I could just as easily say that Safari shouldn’t be blamed for a buggy website, but I’d be overreaching just as much as you just did.
It may have security implications, or it may not. It might just be an innocent case of someone using assertions instead of proper error reporting. Nevertheless it's a bug in the browser.