[winrid]

Reminds me of the Wave Function Collapse algorithm, although doesn't look to be that.

https://github.com/mxgmn/WaveFunctionCollapse

What algorithm is this using? Got a GitHub link?

[masfrost]

If you see a .repl.co or .repl.run link you can get to the source by going to /__repl

Here's the source https://random-roads--edwardcunningh2.repl.co/__repl

[shobith]

It seems to be available in browser, see script.js it's not minified.