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Introspection

feature-exists($feature) Returns whether a feature exists in the current Sass runtime.
variable-exists($name) Returns whether a variable with the given name exists in the current scope.
global-variable-exists($name) Returns whether a variable with the given name exists in the global scope.
function-exists($name) Returns whether a function with the given name exists.
mixin-exists($name) Returns whether a mixin with the given name exists.
inspect($value) Returns the string representation of a value as it would be represented in Sass.
type-of($value) Returns the type of a value
unit($number) Returns the unit(s) associated with a number.
unitless($number) Returns whether a number has units.
comparable($number1, $number2) Returns whether two numbers can be added, subtracted, or compared.
call($name, $args…) Dynamically calls a Sass function.
There are 4 features in Sass.
.a { width: if(feature-exists(global-variable-shadowing), 100px, 200px); }
.b { width: if(feature-exists(extend-selector-pseudoclass), 100px, 200px); }
.c { width: if(feature-exists(units-level-3), 100px, 200px); }
.d { width: if(feature-exists(at-error), 100px, 200px); }
.e:after {content: type-of(#300 2px);}

.a {
  width: 100px;
}

.b {
  width: 100px;
}

.c {
  width: 100px;
}

.d {
  width: 100px;
}

.e:after {
  content: list;
}