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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.

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

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/", /regex/, "non-regex"]

Given:

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

The following patterns are not considered problems:

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