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What is the correct syntax to define default values to mixin variables?

15. What is the correct syntax to define default values to mixin variables?

1. @mixin mixin_name($variable: default_value, $variable: default_value) {properties: values/variables;}
2. @mixin mixin_name($variable=default_value, $variable=default_value) {properties: values/variables;}
3. @mixin mixin_name($variable-default_value, $variable-default_value) {properties: values/variables;}
4. All of the above

Answer: A) @mixin mixin_name($variable: default_value, $variable: default_value) {properties: values/variables;}

Explanation:

The correct syntax to define default values to mixin variables is,

@mixin mixin_name($variable=default_value, $variable=default_value) {properties: values/variables;}

Example:

@mixin post($color: red, $width: 2px) {
  border: $width solid $color;
}