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selector-pseudo-element-no-unknown

Disallow unknown pseudo-element selectors.

  a::before {}
/** ↑
* This pseudo-element selector */

This rule considers pseudo-element selectors defined in the CSS Specifications, up to and including Editor's Drafts, to be known.

This rule ignores vendor-prefixed pseudo-element selectors.

Options

true

The following patterns are considered problems:

a::pseudo {}
a::PSEUDO {}
a::element {}

The following patterns are not considered problems:

a:before {}
a::before {}
::selection {}
input::-moz-placeholder {}

Optional secondary options

ignorePseudoElements: ["/regex/", "string"]

Given:

["/^my-/", "pseudo-element"]

The following patterns are not considered problems:

a::pseudo-element {}
a::my-pseudo {}
a::my-other-pseudo {}