selector_parse($selector) Parses a user-provided selector into a list of lists of strings as returned by &

rgba($red, $green, $blue, $alpha) rgba($color, $alpha)

mix($color1, $color2, $weight:50%) Mixes two colors together. Specifically, takes the average of each of the RGB components

zip($lists...) Combines several lists into a single multidimensional list. The nth value of the resulting list is a space

green($color) Gets the green component of a color. Calculated from HSL where necessary via

adjust_color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha]) Increases or decreases one

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

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

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

invert($color) Returns the inverse (negative) of a color. The red, green, and blue values are inverted, while the opacity