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declaration-block-no-duplicate-properties warn

Disallow duplicate properties within declaration blocks. This rule ignores variables ($sass, @less, --custom-property).

Examples

❌  Incorrect

a { 
    color: #FFFFFF;
    color: #000000; 
}
a { 
    color: #FFFFFF;
    background: #000000; 
    color: #000000;
}

✅  Correct

a { 
    color: #ffffff;
}
a { 
    color: #ffffff; 
    background: #000000;
}