ReadonlyoperatorThe CSSMathValue.operator read-only property of the CSSMathValue interface indicates the operator that the current subtype represents. For example, if the current CSSMathValue subtype is CSSMathSum, this property will return the string "sum".
The add() method of the CSSNumericValue interface adds a supplied number to the CSSNumericValue.
The div() method of the CSSNumericValue interface divides the CSSNumericValue by the supplied value.
The equals() method of the CSSNumericValue interface returns a boolean indicating whether the passed value are strictly equal. To return a value of true, all passed values must be of the same type and value and must be in the same order. This allows structural equality to be tested quickly.
The max() method of the CSSNumericValue interface returns the highest value from among the values passed. The passed values must be of the same type.
The min() method of the CSSNumericValue interface returns the lowest value from among those values passed. The passed values must be of the same type.
The mul() method of the CSSNumericValue interface multiplies the CSSNumericValue by the supplied value.
The sub() method of the CSSNumericValue interface subtracts a supplied number from the CSSNumericValue.
The to() method of the CSSNumericValue interface converts a numeric value from one unit to another.
The toSum() method of the CSSNumericValue interface converts the object's value to a CSSMathSum object to values of the specified unit.
The type() method of the CSSNumericValue interface returns the type of CSSNumericValue, one of angle, flex, frequency, length, resolution, percent, percentHint, or time.
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CSSMathValueinterface of the CSS Typed Object Model API a base class for classes representing complex numeric values.MDN Reference