CSSPropertyRule: initialValue property

Baseline 2024
Newly available

Since July 2024, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

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The read-only initialValue nullable property of the CSSPropertyRule interface returns the initial value of the custom property registration represented by the @property rule, controlling the property's initial value.

Value

A string which is a <declaration-value> as defined in CSS Syntax 3.

Examples

This stylesheet contains a single @property rule. The first CSSRule returned will be a CSSPropertyRule representing this rule. The initialValue property returns the string "#c0ffee" this being the value of the initial-value property in the CSS.

css
@property --property-name {
  syntax: "<color>";
  inherits: false;
  initial-value: #c0ffee;
}
js
let myRules = document.styleSheets[0].cssRules;
console.log(myRules[0].initialValue); //the string "#c0ffee"

Specifications

Specification
CSS Properties and Values API Level 1
# dom-csspropertyrule-initialvalue

Browser compatibility

Report problems with this compatibility data on GitHub
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
initialValue

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Full support