The sign() CSS function contains One calculation, and returns -1 if the numeric value of the argument is negative, +1 if the numeric value of the argument is positive, 0⁺ if the numeric value of the argument is 0⁺, and 0⁻ if the numeric value of the argument is 0⁻....sign() CSS function contains one calculation, and returns -1 if...sign(x) function accepts only one value as its parameter. x A calculation...