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Showing content from http://sass-lang.com/documentation/values/null below:

Sass: null

The value null is the only value of its type. It represents the absence of a value, and is often returned by functions to indicate the lack of a result.

If a list contains a null, that null is omitted from the generated CSS.

If a property value is null, that property is omitted entirely.

null is also falsey, which means it counts as false for any rules or operators that take booleans. This makes it easy to use values that can be null as conditions for @if and if().

• SCSS
• Sass
• CSS

@mixin app-background($color) {
  #{if(&, '&.app-background', '.app-background')} {
    background-color: $color;
    color: rgba(#fff, 0.75);
  }
}

@include app-background(#036);

.sidebar {
  @include app-background(#c6538c);
}

@mixin app-background($color)
  #{if(&, '&.app-background', '.app-background')}
    background-color: $color
    color: rgba(#fff, 0.75)



@include app-background(#036)

.sidebar
  @include app-background(#c6538c)

.app-background {
  background-color: #036;
  color: rgba(255, 255, 255, 0.75);
}

.sidebar.app-background {
  background-color: #c6538c;
  color: rgba(255, 255, 255, 0.75);
}

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