declaration-block-no-duplicate-custom-properties

Disallow duplicate custom properties within declaration blocks.

a { --custom-property: pink; --custom-property: orange; }
/** ↑                        ↑
 * These duplicated custom properties */

This rule is case-sensitive.

Options

true

The following patterns are considered problems:

a { --custom-property: pink; --custom-property: orange; }

a { --custom-property: pink; background: orange; --custom-property: orange }

The following patterns are not considered problems:

a { --custom-property: pink; }

a { --custom-property: pink; --cUstOm-prOpErtY: orange; }