stylelint/src/rules/declaration-block-no-duplicate-properties/README.md

Modern CSS linter

# declaration-block-no-duplicate-properties

Disallow duplicate properties within declaration blocks.

```css
a { color: pink; color: orange; }
/** ↑            ↑
 * These duplicated properties */
```

This rule ignores variables (`$sass`, `@less`, `--custom-property`).

The following patterns are considered warnings:

```css
a { color: pink; color: orange; }
```

```css
a { color: pink; background: orange; color: orange }
```

The following patterns are *not* considered warnings:

```css
a { color: pink; }
```

```css
a { color: pink; background: orange; }
```