The cssValueType read-only property of the CSSValue interface represents the type of the current computed CSS property value.
Syntax
cssValueType = cssValue.cssValueType;
Value
An unsigned short representing a code defining the type of the value. Possible values are:
Constant
Description
CSS_CUSTOM
The value is a custom value.
CSS_INHERIT
The value is inherited and the cssText contains "inherit".
CSS_PRIMITIVE_VALUE
The value is a primitive value and an instance of the CSSPrimitiveValue interface can be obtained by using binding-specific casting methods on this instance of the CSSValue interface.
CSS_VALUE_LIST
The value is a CSSValue list and an instance of the CSSValueList interface can be obtained by using binding-specific casting methods on this instance of the CSSValue interface.
Example
var styleDeclaration = document.styleSheets[0].cssRules[0].style;
var cssValue = styleDeclaration.getPropertyCSSValue("color");
console.log(cssValue.cssValueType);