hue($color) Returns the hue component of a color. See

unitless($number) Returns whether a number has units.

keywords($args) Returns the map of named arguments passed to a function or mixin that takes a variable argument list. The

darken($color, $amount) Makes a color darker. Takes a color and a number between 0% and 100%, and returns a color with the

list_separator($list) Returns the separator of a list. If the list doesn’t have a separator due to having fewer than two

is_superselector($super, $sub) Returns whether $super is a superselector of $sub. This means that

counter($args...) This function only exists as a workaround for IE7‘s

max($numbers...) Finds the maximum of several numbers. This function takes any number of arguments.

adjust_hue($color, $degrees) Changes the hue of a color. Takes a color and a number of degrees (usually between -360deg

type_of($value) Returns the type of a value.