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Showing content from http://sass-lang.com/documentation/operators/string below:

Sass supports a few operators that generate strings:

<expression> + <expression> returns a string that contains both expressions’ values. If the either value is a quoted string, the result will be quoted; otherwise, it will be unquoted.
<expression> - <expression> returns an unquoted string that contains both expressions’ values, separated by -. This is a legacy operator, and interpolation should generally be used instead.

These operators don’t just work for strings! They can be used with any values that can be written to CSS, with a few exceptions:

Numbers can’t be used as the left-hand value, because they have their own operators.
Colors can’t be used as the left-hand value, because they used to have their own operators.

⚠️ Heads up!

It’s often cleaner and clearer to use interpolation to create strings, rather than relying on these operators.

For historical reasons, Sass also supports / and - as a unary operators which take only one value:

/<expression> returns an unquoted string starting with / and followed by the expression’s value.
-<expression> returns an unquoted string starting with - and followed by the expression’s value.

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