global_variable_exists($name) Check whether a variable with the given name exists in the global scope (at the top level of the file). Examples: $a-false-value: false; global-variable-exists(a-false-value) => true .foo { $some-var: false; @if global-variable-exists(some-var) { /* false, doesn't run */ } } Parameters: $name (String) — The name of the variable to check. The name should not include the $. Returns: (Bool) — Whether the variable is defined in the global scope

opacity($color) Returns the alpha component (opacity) of a color. This is 1 unless otherwise specified. Parameters: $color (Color) Returns: (Number) — The alpha component, between 0 and 1 Raises: (ArgumentError) — if $color isn’t a color

:compressed Compressed style takes up the minimum amount of space possible, having no whitespace except that necessary to separate selectors and a newline at the end of the file. It also includes some other minor compressions, such as choosing the smallest representation for colors. It’s not meant to be human-readable. For example: #main{color:#fff;background-color:#000}#main p{width:10em}.huge{font-size:10em;font-weight:bold;text-decoration:underline}

@if The @if directive takes a SassScript expression and uses the styles nested beneath it if the expression returns anything other than false or null: p { @if 1 + 1 == 2 { border: 1px solid; } @if 5 < 3 { border: 2px dotted; } @if null { border: 3px double; } } is compiled to: p { border: 1px solid; } The @if statement can be followed by several @else if statements and one @else statement. If the @if statement fails, the @else if statements are tried in order until one s

darken($color, $amount) Makes a color darker. Takes a color and a number between 0% and 100%, and returns a color with the lightness decreased by that amount. Examples: darken(hsl(25, 100%, 80%), 30%) => hsl(25, 100%, 50%) darken(#800, 20%) => #200 Parameters: $color (Color) $amount (Number) — The amount to decrease the lightness by, between 0% and 100% Returns: (Color) Raises: (ArgumentError) — if $amount is out of bounds, or either parameter is the wrong type

Including a Mixin: @include Mixins are included in the document with the @include directive. This takes the name of a mixin and optionally arguments to pass to it, and includes the styles defined by that mixin into the current rule. For example: .page-title { @include large-text; padding: 4px; margin-top: 10px; } is compiled to: .page-title { font-family: Arial; font-size: 20px; font-weight: bold; color: #ff0000; padding: 4px; margin-top: 10px; } Mixins may also be included o

@import Sass extends the CSS @import rule to allow it to import SCSS and Sass files. All imported SCSS and Sass files will be merged together into a single CSS output file. In addition, any variables or mixins defined in imported files can be used in the main file. Sass looks for other Sass files in the current directory, and the Sass file directory under Rack, Rails, or Merb. Additional search directories may be specified using the :load_paths option, or the --load-path option on the command

@error The @error directive throws the value of a SassScript expression as a fatal error, including a nice stack trace. It’s useful for validating arguments to mixins and functions. For example: @mixin adjust-location($x, $y) { @if unitless($x) { @error "$x may not be unitless, was #{$x}."; } @if unitless($y) { @error "$y may not be unitless, was #{$y}."; } position: relative; left: $x; top: $y; } There is currently no way to catch errors.

Parentheses Parentheses can be used to affect the order of operations: p { width: 1em + (2em * 3); } is compiled to: p { width: 7em; }

lighten($color, $amount) Makes a color lighter. Takes a color and a number between 0% and 100%, and returns a color with the lightness increased by that amount. Examples: lighten(hsl(0, 0%, 0%), 30%) => hsl(0, 0, 30) lighten(#800, 20%) => #e00 Parameters: $color (Color) $amount (Number) — The amount to increase the lightness by, between 0% and 100% Returns: (Color) Raises: (ArgumentError) — if $amount is out of bounds, or either parameter is the wrong type