feature_exists

feature_exists($feature)

Returns whether a feature exists in the current Sass runtime.

The following features are supported:

• global-variable-shadowing indicates that a local variable will shadow a global variable unless !global is used.

• extend-selector-pseudoclass indicates that @extend will reach into selector pseudoclasses like :not.

• units-level-3 indicates full support for unit arithmetic using units defined in the Values and Units Level 3 spec.

• at-error indicates that the Sass @error directive is supported.

feature-exists(some-feature-that-exists) => true
feature-exists(what-is-this-i-dont-know) => false