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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; }