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Contents
# at-rule-no-unknown
Disallow unknown at-rules.
<!-- prettier-ignore -->
```css
@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.
## Options
### `true`
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
@unknown {}
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
@charset "UTF-8";
```
<!-- prettier-ignore -->
```css
@CHARSET "UTF-8";
```
<!-- prettier-ignore -->
```css
@media (max-width: 960px) {}
```
<!-- prettier-ignore -->
```css
@font-feature-values Font One {
@styleset {}
}
```
## Optional secondary options
### `ignoreAtRules: ["/regex/", /regex/, "string"]`
Given:
```
["/^my-/", "custom"]
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
@my-at-rule "x.css";
```
<!-- prettier-ignore -->
```css
@my-other-at-rule {}
```
<!-- prettier-ignore -->
```css
@custom {}
```
Version data entries
24 entries across 24 versions & 1 rubygems