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# selector-pseudo-class-case
Specify lowercase or uppercase for pseudo-class selectors.
```css
a:hover {}
/** ↑
* This pseudo-class selector */
```
The `--fix` option on the [command line](../../../docs/user-guide/cli.md#autofixing-errors) can automatically fix all of the problems reported by this rule.
## Options
`string`: `"lower"|"upper"`
### `"lower"`
The following patterns are considered violations:
```css
a:Hover {}
```
```css
a:hOvEr {}
```
```css
a:HOVER {}
```
```css
:ROOT {}
```
```css
:-MS-INPUT-PLACEHOLDER {}
```
The following patterns are *not* considered violations:
```css
a:hover {}
```
```css
:root {}
```
```css
:-ms-input-placeholder {}
```
### `"upper"`
The following patterns are considered violations:
```css
a:Hover {}
```
```css
a:hOvEr {}
```
```css
a:hover {}
```
```css
:root {}
```
```css
:-ms-input-placeholder {}
```
The following patterns are *not* considered violations:
```css
a:HOVER {}
```
```css
:ROOT {}
```
```css
:-MS-INPUT-PLACEHOLDER {}
```
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