CssValueType
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".
Initial = 4
The value is in its initial state and might be inherited, if applicable.
List = 2
The value is a CSSValue list and an instance of the CSSValueList.
Primitive = 1
The value is a primitive value and an instance of the CSSPrimitiveValue.