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stylelint

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A mighty, modern CSS linter.

stylelint.io

stylelint/stylelint

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# color-function-notation Specify modern or legacy notation for applicable color-functions. <!-- prettier-ignore --> ```css a { color: rgb(0 0 0 / 0.2) } /** ↑ * This notation */ ``` Modern color-functions use a comma-free syntax because functions in CSS are used to group/name a syntax chunk. They should work by the same rules that CSS grammar does in general: values are optional and re-orderable when possible, space-separated, and commas are used to separate repetitions only. For legacy reasons, `rgb()` and `hsl()` also supports an alternate syntax that separates all of its arguments with commas. Also for legacy reasons, the `rgba()` and `hsla()` functions exist using the same comma-based syntax. The [`fix` option](../../../docs/user-guide/usage/options.md#fix) can automatically fix some of the problems reported by this rule when the primary option is `"modern"`. ## Options `string`: `"modern"|"legacy"` ### `"modern"` Applicable color-functions _must always_ use modern notation. The following patterns are considered violations: <!-- prettier-ignore --> ```css a { color: rgb(0, 0, 0) } ``` <!-- prettier-ignore --> ```css a { color: rgba(12, 122, 231, 0.2) } ``` <!-- prettier-ignore --> ```css a { color: hsla(270, 60%, 50%, 15%) } ``` <!-- prettier-ignore --> ```css a { color: hsl(.75turn, 60%, 70%) } ``` The following patterns are _not_ considered violations: <!-- prettier-ignore --> ```css a { color: rgb(0 0 0) } ``` <!-- prettier-ignore --> ```css a { color: rgb(12 122 231 / 0.2) } ``` <!-- prettier-ignore --> ```css a { color: hsl(270 60% 50% / 15%) } ``` <!-- prettier-ignore --> ```css a { color: hsl(.75turn 60% 70%) } ``` ### `"legacy"` Applicable color-functions _must always_ use the legacy notation. The following patterns are considered violations: <!-- prettier-ignore --> ```css a { color: rgb(0 0 0) } ``` <!-- prettier-ignore --> ```css a { color: rgb(12 122 231 / 0.2) } ``` <!-- prettier-ignore --> ```css a { color: hsl(270 60% 50% / 15%) } ``` <!-- prettier-ignore --> ```css a { color: hsl(.75turn 60% 70%) } ``` The following patterns are _not_ considered violations: <!-- prettier-ignore --> ```css a { color: rgb(0, 0, 0) } ``` <!-- prettier-ignore --> ```css a { color: rgba(12, 122, 231, 0.2) } ``` <!-- prettier-ignore --> ```css a { color: hsla(270, 60%, 50%, 15%) } ``` <!-- prettier-ignore --> ```css a { color: hsl(.75turn, 60%, 70%) } ```