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Can I do square elbows if I modify the shape(). And keep it always on the sides?

Yes, you can do almost whatever you want. I will be sharing more idea of connectors soon and also write a detailed article about the technique and how you can adjust the code to get any shape you want.

if() in CSS is really interesting. That's the kind of thing that can be theoretically tricky because it can accidentally make CSS Turing complete, so it introduces parsing complexity. I dug into it and appaerntly there's been a lot of back and forth about implementing it carefully to avoid this.