& in SassScript Just like when it’s used in selectors, & in SassScript refers to the current parent selector

lighten($color, $amount) Makes a color lighter. Takes a color and a number between 0% and 100%

unquote($string) Removes quotes from a string. If the string is already unquoted, this will return it unmodified.

desaturate($color, $amount) Makes a color less saturated. Takes a color and a number between 0% and 100%, and returns a color

selector_append($selectors...) Return a new selector with all selectors in $selectors appended one another as

index($list, $value) Returns the position of a value within a list. If the value isn’t found, returns null instead

call($name, $args...) Dynamically calls a function. This can call user-defined functions, built-in functions, or plain CSS

Placeholder Selectors: %foo Sass supports a special type of selector called a “placeholder selector”. These look like class and

transparentize($color, $amount) Also known as: fade_out Makes

percentage($number) Converts a unitless number to a percentage.