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Mixin arguments can be assigned a default value in the mixin definition by using a special notation.

A default value is assigned to the argument if no value is passed in when the mixin is included. Defining a default value for each argument is optional.

The notation is as follows:

@mixin backface-visibility($visibility: hidden) { backface-visibility: $visibility; -webkit-backface-visibility: $visibility; -moz-backface-visibility: $visibility; -ms-backface-visibility: $visibility; -o-backface-visibility: $visibility; }

In the example above, if no value is passed in when backface-visibility is included, hidden would be assigned to all properties.

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