CssValue
This enumeration is indicating which type of unit applies to the value.
Custom = 3
The value is a custom value.
Inherit = 0
The value is inherited and the CssText contains "inherit".
PrimitiveValue = 1
The value is a primitive value and an instance of the CSSPrimitiveValue.
ValueList = 2
The value is a CSSValue list and an instance of the CSSValueList.