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Re:Design Tips for Developers by coddingtonbear on Thursday January 23, 2020 @12:01PM (#22129233)
Might be a mermaid graph, I think.

https://mermaid-js.github.io/mermaid/#/

Re:Design Tips for Developers by kiwicopple on Thursday January 23, 2020 @03:17PM (#22131450)
This is correct - I use mermaid js (the site is made with VuePress)