It’s a TeuxDeux clone in plain HTML, CSS and JavaScript. More importantly, it’s a case study showing that vanilla web development is viable in terms of maintainability, and worthwhile in terms of performance.

There’s no custom framework invented here. Instead, the case study was designed to find minimum viable patterns that are truly vanilla (see the rules). The result is maintainable, albeit verbose and with considerable duplication in certain areas.

If anything, it shows the value frameworks provide, but also highlights how effective standard web technologies can be used.