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css-at-property

Use when implementing animated gradients, complex CSS transitions that involve custom property values, or building a typed design token system where custom property misuse should produce visible errors.

skills/css-at-property/SKILL.md

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# Register CSS custom properties with @property for animation and type safety

CSS custom properties are powerful but limited by default: they are untyped string substitutions that the browser cannot interpolate during transitions or animations. Registering a property with @property gives the browser the information it needs to animate between values, validate token assignments, and scope inheritance — turning custom properties from string macros into first-class typed values. This unlocks gradient animations, typed design tokens, and scoped component theming that are impossible with unregistered properties.

## Quick Reference

- Unregistered custom properties cannot be animated — they transition as discrete strings
- @property specifies syntax (color, length, number), initial-value, and inherits
- Registered properties enable smooth interpolation for gradients and complex values
- inherits: false creates scoped tokens that do not cascade to children

## Check

Review the CSS custom properties in this file. Identify any properties that are used in transitions or animations — these require @property registration to animate correctly.