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function-no-unknown

Disallow unknown functions.

a { transform: unknown(1); }
/**            ↑
 * Functions like this */

This rule considers functions defined in the CSS Specifications to be known.

This rule ignores double-dashed custom functions, e.g. --custom-function().

Options​

true​

The following patterns are considered problems:

a { transform: unknown(1); }

The following patterns are not considered problems:

a { transform: scale(1); }
a { transform: --custom-function(1); }

Optional secondary options​

ignoreFunctions: ["/regex/", /regex/, "non-regex"]​

Ignore the specified functions.

For example, with true.

Given:

["theme", "/^foo-/"]

The following patterns are not considered problems:

a { transform: theme(1); }
a { transform: foo-func(1); }