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at-rule-no-unknown

Disallow unknown at-rules.

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

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

The message secondary option can accept the arguments of this rule.

Options​

true​

The following patterns are considered problems:

@unknown {}

The following patterns are not considered problems:

@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 problems:

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