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# declaration-property-unit-whitelist
Specify a whitelist of allowed property and unit pairs within declarations.
```css
a { width: 100px; }
/** ↑ ↑
* These properties and these units */
```
## Options
`object`: `{
"unprefixed-property-name": ["array", "of", "units"]
}`
If a property name is surrounded with `"/"` (e.g. `"/^animation/"`), it is interpreted as a regular expression. This allows, for example, easy targeting of shorthands: `/^animation/` will match `animation`, `animation-duration`, `animation-timing-function`, etc.
Given:
```js
{
"font-size": ["em", "px"],
"/^animation/": ["s"],
"line-height": []
}
```
The following patterns are considered violations:
```css
a { font-size: 1.2rem; }
```
```css
a { animation: animation-name 500ms ease; }
```
```css
a { -webkit-animation: animation-name 500ms ease; }
```
```css
a { animation-duration: 500ms; }
```
```css
a { line-height: 13px; }
```
The following patterns are *not* considered violations:
```css
a { font-size: 1em; }
```
```css
a { height: 100px; }
```
```css
a { animation: animation-name 5s ease; }
```
```css
a { -webkit-animation: animation-name 5s ease; }
```
```css
a { animation-duration: 5s; }
```
```css
a { line-height: 1; }
```
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