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Contents
# selector-pseudo-element-no-unknown
Disallow unknown pseudo-element selectors.
<!-- prettier-ignore -->
```css
a::before {}
/** ↑
* This pseudo-element selector */
```
This rule considers pseudo-element selectors defined in the CSS Specifications, up to and including Editor's Drafts, to be known.
This rule ignores vendor-prefixed pseudo-element selectors.
## Options
### `true`
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a::pseudo {}
```
<!-- prettier-ignore -->
```css
a::PSEUDO {}
```
<!-- prettier-ignore -->
```css
a::element {}
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a:before {}
```
<!-- prettier-ignore -->
```css
a::before {}
```
<!-- prettier-ignore -->
```css
::selection {}
```
<!-- prettier-ignore -->
```css
input::-moz-placeholder {}
```
## Optional secondary options
### `ignorePseudoElements: ["/regex/", "string"]`
Given:
```
["/^my-/", "pseudo-element"]
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a::pseudo-element {}
```
<!-- prettier-ignore -->
```css
a::my-pseudo {}
```
<!-- prettier-ignore -->
```css
a::my-other-pseudo {}
```
Version data entries
24 entries across 24 versions & 1 rubygems