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# alpha-value-notation
Specify percentage or number notation for alpha-values.
<!-- prettier-ignore -->
```css
a { color: rgb(0 0 0 / 0.5) }
/** ↑
* This notation */
```
The [`fix` option](../../../docs/user-guide/usage/options.md#fix) can automatically fix all of the problems reported by this rule.
## Options
`string`: `"number"|"percentage"`
### `"number"`
Alpha-values _must always_ use the number notation.
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a { opacity: 50% }
```
<!-- prettier-ignore -->
```css
a { color: rgb(0 0 0 / 50%) }
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a { opacity: 0.5 }
```
<!-- prettier-ignore -->
```css
a { color: rgb(0 0 0 / 0.5) }
```
### `"percentage"`
Alpha-values _must always_ use percentage notation.
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a { opacity: 0.5 }
```
<!-- prettier-ignore -->
```css
a { color: rgb(0 0 0 / 0.5) }
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a { opacity: 50% }
```
<!-- prettier-ignore -->
```css
a { color: rgb(0 0 0 / 50%) }
```
## Optional secondary options
### `exceptProperties: ["/regex/", /regex/, "string"]`
Reverse the primary option for matching properties.
For example with `"percentage"`.
Given:
```
["opacity"]
```
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a { opacity: 50% }
```
<!-- prettier-ignore -->
```css
a { color: rgb(0 0 0 / 0.5) }
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a { opacity: 0.5 }
```
<!-- prettier-ignore -->
```css
a { color: rgb(0 0 0 / 50%) }
```