This is a game of Connect 4, with the only JavaScript being that of HTMX, and on a static host. All other JavaScript is disallowed by the CSP (in a meta tag since I can't control headers on GitHub Pages). Check with Right Click → View Source!
Note that a lot of the functionality is implemented through CSS. Your browser needs to
support the :has
selector for things like win detection to work.
Additionally, I've made an
explanation of how this was made
on my blog.