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Mixins also have the ability to take in a value.

An argument, or parameter, is a value passed to the mixin that will be used inside the mixin, such as $visibility in this example:

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

In fact, you should only ever use a mixin if it takes an argument. We will learn more about this in a later exercise.

The syntax to pass in a value is as follows:

@include backface-visibility(hidden);

In the code above, hidden is passed in to the backface-visibility mixin, where it will be assigned as the value of its argument, $visibility.

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