CSS @property Generator
Free online CSS @property generator. Build typed custom properties with syntax, inherits, and initial-value controls.
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What is CSS @property Generator?
CSS @property Generator is a visual tool for defining typed CSS custom properties. The @property at-rule lets you declare a property syntax, whether it inherits, and its initial value, making CSS variables easier to validate, animate, and maintain in design systems.
Key Benefits
- Typed and validated CSS custom properties
- Smooth transitions and animations for supported values
- Explicit inheritance behavior
- Consistent initial values for design tokens
- Copy-ready, formatted CSS output
Common Use Cases
- •CSS Houdini experiments
- •Animated color and length variables
- •Design system tokens
- •Reusable component styling
How to Use the CSS @property Generator
- Name the property: Enter a custom property name beginning with two hyphens, such as --brand-color.
- Choose syntax: Select the value type that the browser should enforce, such as <color> or <length>.
- Set inheritance and initial value: Choose whether the property inherits and enter a valid initial value for its syntax.
- Preview and copy: Review the live preview, then copy the generated @property rule into your stylesheet.
Key Features
- Generate valid @property at-rules with formatted CSS
- Choose common syntax types including color, length, number, and percentage
- Configure inheritance behavior and initial values
- Live preview of the configured custom property value
- Copy-ready output for CSS Houdini and design systems
- Runs entirely in your browser with no data uploads
Frequently Asked Questions
What does the CSS @property rule do?
The @property rule registers a CSS custom property with a syntax, inheritance behavior, and initial value so browsers can understand and interpolate it more reliably.
Why define a syntax for a custom property?
A syntax type lets the browser validate values and interpolate compatible values for transitions and animations, such as smoothly animating a registered color or length.
What does inherits: false mean?
It prevents the custom property from inheriting from the parent element. Descendants use the declared initial value unless they receive another value directly.
Can I use @property for CSS animations?
Yes. Registered properties with a supported syntax can be interpolated, enabling animations and transitions for values that untyped custom properties cannot animate smoothly.