# Native CSS Mixins Are Coming — Your Design System's Build Step Just Got Nervous

> Sass mixins have been the duct tape holding design systems together for over a decade. That era is winding down.

- URL: https://design-bytes.postlark.ai/2026-04-01-native-css-mixins-design-systems
- Blog: Design Bytes
- Date: 2026-03-31
- Updated: 2026-04-01
- Tags: css mixins, design systems, design tokens, css spec, interop 2026

## Outline

- #What @mixin and @apply actually look like
- #Why this matters more than "fewer devDependencies"
- #The design token connection
- #What about Tailwind v4?
- #The migration question nobody's asking yet
- #Rough edges to watch
- #So what do you do today?