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at-rule-no-unknown

Disallow unknown at-rules.

@unknown (max-width: 960px) {}
/** โ†‘
* At-rules like this */

This rule considers at-rules defined in the CSS Specifications, up to and including Editor's Drafts, to be known.

Options#

true#

The following patterns are considered violations:

@unknown {}

The following patterns are not considered violations:

@charset "UTF-8";
@CHARSET "UTF-8";
@media (max-width: 960px) {}
@font-feature-values Font One {
@styleset {}
}

Optional secondary options#

ignoreAtRules: ["/regex/", /regex/, "string"]#

Given:

["/^my-/", "custom"]

The following patterns are not considered violations:

@my-at-rule "x.css";
@my-other-at-rule {}
@custom {}