str_length($string) Returns the number of characters in a string.

str_insert($string, $insert, $index) Inserts $insert into $string at $index.

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

:nested Nested style is the default Sass style, because it reflects the structure of the CSS styles and the HTML document they’re

rgb($red, $green, $blue) Creates a Color object from red, green, and blue values.

grayscale($color) Converts a color to grayscale. This is identical to desaturate(color, 100%).

set Return a new list, based on the list provided, but with the nth element changed to the value given.

@at-root The @at-root directive causes one or more rules to be emitted at the root of the document, rather than being

Defining a Mixin: @mixin Mixins are defined with the @mixin directive. It’s followed by the name of the mixin and

map_get($map, $key) Returns the value in a map associated with the given key. If the map doesn’t have such a key, returns