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Disallow unmatchable An+B selectors.

a:nth-child(0n+0) {}
/*↑ ↑
* This unmatchable An+B selector */

An+B selectors are one-indexed. Selectors that always evaluate to 0 will not match any elements.

The message secondary option can accept the arguments of this rule.



The following patterns are considered problems:

a:nth-child(0) {}
a:nth-last-child(0n) {}
a:nth-of-type(0n+0) {}
a:nth-last-of-type(0 of a) {}

The following patterns are not considered problems:

a:nth-child(1) {}
a:nth-last-child(1n) {}
a:nth-of-type(1n+0) {}
a:nth-last-of-type(1 of a) {}