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Limit the number of compound selectors in a selector.

   div .bar[data-val] > a.baz + .boom > #lorem {}
/* ↑   ↑                ↑       ↑       ↑
   |   |                |       |       |
  Lv1 Lv2              Lv3     Lv4     Lv5  -- these are compound selectors */

A compound selector is a chain of one or more simple (tag, class, id, universal, attribute) selectors. If there is more than one compound selector in a complete selector, they will be separated by combinators (e.g. , +, >). One reason why you might want to limit the number of compound selectors is described in the SMACSS book.

This rule resolves nested selectors before calculating the depth of a selector.

:not() is considered one compound selector irrespective to the complexity of the selector inside it. The rule does process that inner selector, but does so separately, independent of the main selector.


int: Maximum compound selectors allowed.

For example, with 3:

The following patterns are considered warnings:

.foo .bar .baz .lorem {}
.foo .baz {
  & > .bar .lorem {}

The following patterns are not considered warnings:

div {}
.foo div {}
#foo #bar > #baz {}
.foo + div :not (a b ~ c) {} /* `a b ~ c` is inside :not() and is processed separately */