CSS Properties and Values API
The CSS Properties and Values API — part of the CSS Houdini umbrella of APIs — allows developers to explicitly define their CSS custom properties, allowing for property type checking, default values, and properties that do or do not inherit their value.
Interfaces
CSS.registerProperty-
Defines how a browser should parse CSS custom properties. Access this interface through
CSS.registerPropertyin JavaScript. @property-
Defines how a browser should parse CSS custom properties. Access this interface through
@propertyat-rule in CSS.
Examples
The following will register a custom property named --my-color using CSS.registerProperty in JavaScript. --my-color will use the CSS color syntax, it will have a default value of #c0ffee, and it will not inherit its value:
window.CSS.registerProperty({
name: "--my-color",
syntax: "<color>",
inherits: false,
initialValue: "#c0ffee",
});
The same registration can take place in CSS using the @property at-rule:
@property --my-color {
syntax: "<color>";
inherits: false;
initial-value: #c0ffee;
}
Specifications
| Specification |
|---|
| CSS Properties and Values API Level 1 # the-css-property-rule-interface |
| CSS Properties and Values API Level 1 # the-registerproperty-function |