Skip to main content

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.

For customizing syntax, see the languageOptions section.

Options​

true​

{
  "at-rule-no-unknown": true
}

The following patterns are considered problems:

@unknown {}

The following patterns are not considered problems:

@media (max-width: 960px) {}
@font-feature-values Font One {
  @styleset {}
}

Optional secondary options​

ignoreAtRules​

{ "ignoreAtRules": ["array", "of", "at-rules", "/regex/"] }

Given:

{
  "at-rule-no-unknown": [true, { "ignoreAtRules": ["/^--my-/", "--custom"] }]
}

The following patterns are not considered problems:

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