/Web APIs

CSSPropertyRule: initialValue property

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.


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


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.


@property --property-name {
  syntax: "<color>";
  inherits: false;
  initial-value: #c0ffee;


let myRules = document.styleSheets[0].cssRules;
console.log(myRules[0].initialValue); //the string "#c0ffee"


Browser compatibility

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initialvalue 85 85 preview No 71 16.4 85 85 No 60 16.4 14.0

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