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# alpha-value-notation Specify percentage or number notation for alpha-values. <!-- prettier-ignore --> ```css a { color: rgb(0 0 0 / 0.5) } /** ↑ * This notation */ ``` The [`fix` option](../../../docs/user-guide/usage/options.md#fix) can automatically fix all of the problems reported by this rule. ## Options `string`: `"number"|"percentage"` ### `"number"` Alpha-values _must always_ use the number notation. The following patterns are considered violations: <!-- prettier-ignore --> ```css a { opacity: 50% } ``` <!-- prettier-ignore --> ```css a { color: rgb(0 0 0 / 50%) } ``` The following patterns are _not_ considered violations: <!-- prettier-ignore --> ```css a { opacity: 0.5 } ``` <!-- prettier-ignore --> ```css a { color: rgb(0 0 0 / 0.5) } ``` ### `"percentage"` Alpha-values _must always_ use percentage notation. The following patterns are considered violations: <!-- prettier-ignore --> ```css a { opacity: 0.5 } ``` <!-- prettier-ignore --> ```css a { color: rgb(0 0 0 / 0.5) } ``` The following patterns are _not_ considered violations: <!-- prettier-ignore --> ```css a { opacity: 50% } ``` <!-- prettier-ignore --> ```css a { color: rgb(0 0 0 / 50%) } ``` ## Optional secondary options ### `exceptProperties: ["/regex/", /regex/, "string"]` Reverse the primary option for matching properties. For example with `"percentage"`. Given: ``` ["opacity"] ``` The following patterns are considered violations: <!-- prettier-ignore --> ```css a { opacity: 50% } ``` <!-- prettier-ignore --> ```css a { color: rgb(0 0 0 / 0.5) } ``` The following patterns are _not_ considered violations: <!-- prettier-ignore --> ```css a { opacity: 0.5 } ``` <!-- prettier-ignore --> ```css a { color: rgb(0 0 0 / 50%) } ```