Also, even before reading the comments, I was pleasantly surprised that everything on that page worked and nothing bothered me. There is a good amount of attention to detail (switching of the rounding on codeblocks when switching to light mode for example, avoiding a weird corner on mobile). Nothing moves around on load etc. I know this is a low bar, but it's gotten pretty rare, even for pages linked on here.
I'm trying to say that his 100k lines might actually be spent on attention to detail and aren't just slop.