| 1 | # selector-pseudo-class-no-unknown
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| 2 |
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| 3 | Disallow unknown pseudo-class selectors.
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| 4 |
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| 5 | ```css
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| 6 | a:hover {}
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| 7 | /** ↑
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| 8 | * This pseudo-class selector */
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| 9 | ```
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| 10 |
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| 11 | This rule considers pseudo-class selectors defined in the CSS Specifications, up to and including Editor's Drafts, to be known.
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| 12 |
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| 13 | This rule ignores vendor-prefixed pseudo-class selectors.
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| 14 |
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| 15 | ## Options
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| 16 |
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| 17 | ### `true`
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| 18 |
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| 19 | The following patterns are considered violations:
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| 20 |
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| 21 | ```css
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| 22 | a:unknown {}
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| 23 | ```
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| 24 |
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| 25 | ```css
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| 26 | a:UNKNOWN {}
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| 27 | ```
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| 28 |
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| 29 | ```css
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| 30 | a:hoverr {}
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| 31 | ```
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| 32 |
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| 33 | The following patterns are *not* considered violations:
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| 34 |
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| 35 | ```css
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| 36 | a:hover {}
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| 37 | ```
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| 38 |
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| 39 | ```css
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| 40 | a:focus {}
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| 41 | ```
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| 42 |
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| 43 | ```css
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| 44 | :not(p) {}
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| 45 | ```
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| 46 |
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| 47 | ```css
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| 48 | input:-moz-placeholder {}
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| 49 | ```
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| 50 |
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| 51 | ## Optional secondary options
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| 52 |
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| 53 | ### `ignorePseudoClasses: ["/regex/", "string"]`
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| 54 |
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| 55 | Given:
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| 56 |
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| 57 | ```js
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| 58 | ["/^my-/", "pseudo-class"]
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| 59 | ```
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| 60 |
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| 61 | The following patterns are *not* considered violations:
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| 62 |
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| 63 | ```css
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| 64 | a:pseudo-class {}
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| 65 | ```
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| 66 |
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| 67 | ```css
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| 68 | a:my-pseudo {}
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| 69 | ```
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| 70 |
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| 71 | ```css
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| 72 | a:my-other-pseudo {}
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| 73 | ```
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