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It displays the SassScript expression value as fatal error.

It detects the errors and display the SassScript expression values to the standard error output stream.

You can use = for mixin directive and + for include directive which requires less typing and makes your code simpler, and easier to read.

It is used to include the mixin in the document and styles defined by the mixin can be included into the current rule.

It is used to define the mixins that includes optionally the variables and argument after the name of the mixin.

In each directive, a variable is defined which contains the value of each item in a list.

It allows you to generate styles in a loop. The counter variable is used to set the output for each iteration.

The else if statements are used with the if directive, whenever the if statement fails then the else if statements are tried and if they also fails then the else is executed.

It is used to selectively execute the code statements based on the result of the evaluating an expression.