@warn The @warn directive prints the value of a SassScript expression to the standard error output stream. It’s useful

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

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

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

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

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

@while The @while directive takes a SassScript expression and repeatedly outputs the nested styles until the statement

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

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

complement($color) Returns the complement of a color. This is identical to adjust-hue(color, 180deg).