Modern CSS
Recently-shipped CSS features with decision guidance — when to reach for each, what it replaces, and browser support reality. These features are new enough that training data is sparse; this guide exists to make AI-assisted frontend work accurate.
Selectors & Logic
Layout
Cascade & Scoping
Custom Properties
Color
- oklch() / oklab() — Modern Color Spaces
- color-mix()
- Relative Color Syntax
- light-dark() — One-Line Dark Mode