# value-no-vendor-prefix

Disallow vendor prefixes for values.

<!-- prettier-ignore -->
```css
a { display: -webkit-flex; }
/**           ↑
 *  This prefix */
```

This rule ignores non-standard vendor-prefixed values that aren't handled by [Autoprefixer](https://github.com/postcss/autoprefixer).

The [`fix` option](../../../docs/user-guide/options.md#fix) can automatically fix all of the problems reported by this rule. However, it will not remove duplicate values produced when the prefixes are removed. You can use [Autoprefixer](https://github.com/postcss/autoprefixer) itself, with the [`add` option off and the `remove` option on](https://github.com/postcss/autoprefixer#options), in these situations.

The [`message` secondary option](../../../docs/user-guide/configure.md#message) can accept the arguments of this rule.

## Options

### `true`

The following patterns are considered problems:

<!-- prettier-ignore -->
```css
a { display: -webkit-flex; }
```

<!-- prettier-ignore -->
```css
a { max-width: -moz-max-content; }
```

<!-- prettier-ignore -->
```css
a { background: -webkit-linear-gradient(bottom, #000, #fff); }
```

The following patterns are _not_ considered problems:

<!-- prettier-ignore -->
```css
a { display: flex; }
```

<!-- prettier-ignore -->
```css
a { max-width: max-content; }
```

<!-- prettier-ignore -->
```css
a { background: linear-gradient(bottom, #000, #fff); }
```

## Optional secondary options

### `ignoreValues: ["string"]`

Given:

```json
["grab", "max-content"]
```

The following patterns are _not_ considered problems:

<!-- prettier-ignore -->
```css
cursor: -webkit-grab;
```

<!-- prettier-ignore -->
```css
.foo { max-width: -moz-max-content; }
```