css-modern - Modern CSS Features Guide
Provides guidance on modern CSS features including custom properties, container queries, :has(), @layer, and CSS nesting
Tags
Updated: 2026-03-20Capabilities
Typical Inputs
Typical Outputs
What this skill does
- provide custom properties guidance
- provide container queries guidance
- provide :has() selector guidance
- provide @layer guidance
- provide CSS nesting guidance
- show browser compatibility information
- show fallback patterns
Inputs
- feature parameter
- include_fallback flag
- browser_support flag
Outputs
- CSS feature guidance
- browser compatibility information
- fallback patterns
Requirements
- css-fundamentals knowledge