{"arg":"factor", "description":"an integer corresponding to the lightening factor:<ul><li>if the factor is greater than 100, this function returns a lighter color (e.g., setting factor to 150 returns a color that is 50% brighter);</li><li>if the factor is less than 100, the return color is darker, but using the darker() function for this purpose is recommended;</li><li>if the factor is 0 or negative, the return value is unspecified.</li></ul>"}