stylelint
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Modern CSS linter
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# value-list-comma-space-before
Require a single space or disallow whitespace before the commas of value lists.
```css
a { background-size: 0 ,0; }
/** ↑
* The space before these commas */
```
## Options
`string`: `"always"|"never"|"always-single-line"|"never-single-line"`
### `"always"`
There *must always* be a single space before the commas.
The following patterns are considered warnings:
```css
a { background-size: 0,0; }
```
```css
a { background-size: 0
, 0; }
```
The following patterns are *not* considered warnings:
```css
a { background-size: 0 ,0; }
```
```css
a { background-size: 0 ,
0; }
```
### `"never"`
There *must never* be whitespace before the commas.
The following patterns are considered warnings:
```css
a { background-size: 0 ,0; }
```
```css
a { background-size: 0 ,
0; }
```
The following patterns are *not* considered warnings:
```css
a { background-size: 0,0; }
```
```css
a { background-size: 0,
0; }
```
### `"always-single-line"`
There *must always* be a single space before the commas in single-line value lists.
The following patterns are considered warnings:
```css
a { background-size: 0,0; }
```
The following patterns are *not* considered warnings:
```css
a { background-size: 0 ,0; }
```
```css
a { background-size: 0 ,
0; }
```
```css
a { background-size: 0
, 0; }
```
### `"never-single-line"`
There *must never* be whitespace before the commas in single-line value lists.
The following patterns are considered warnings:
```css
a { background-size: 0 ,0; }
```
The following patterns are *not* considered warnings:
```css
a { background-size: 0,0; }
```
```css
a { background-size: 0,
0; }
```
```css
a { background-size: 0 ,
0; }
```