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.

复合选择器是一系列的简单选择器组成的。如果在一个选择器中有一个以上的复合选择器,它们将被关系选择符 (如,+>)分开。限制复合选择器的数量的一个原因在 SMACSS book 中有描述。

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.

:not() 被认为是个复合选择器,无关乎其内部的选择器的复杂度 。该规则会处理其内部的选择器,但是会单独地,独立于主选择器。


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 */