I think this is super cool and definitely fits my mental model of how I think about diagrams and designs! Would love to take a look at the code if its available

I think this is super cool and definitely fits my mental model of how I think about diagrams and designs! Would love to take a look at the code if its available. I'm not a front-end engineer but it seems to me like a more expressive version of CSS parent/child tags and width/height percentages.