Crafting pure-CSS Tailwind plugins

A great CSS plugin is a small, sharp tool: one idea, expressed as a family of composable utilities, that produces an effect with more depth than its size suggests — and zero JavaScript. This skill is how you get there. It pairs deep research into what CSS can actually do with a bespoke workbench for tuning the effect until it feels inevitable, then hardens and packages it for other people to depend on.

The bar is set by two reference plugins. Read their source before you start: