"The Handlebars but as a CGI-app". Because it's fun. And helps Web to stay Smol.
Just do GET with url-encoded
tas a Handlebars template URIdas a JSON data URI
Also you can POST the same stuff either form-encoded or in JSON body with forementioned t+d params in both cases.
Makefile runs the lighttpd as a server which then serves all the stuff from the dev/ folder. One can just open http://localhost:8000/ and click some buttons. The code here is pretty self-explanatory, so you're welcome to play with!