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.

All vendor-prefixed pseudo-element selectors are ignored.

Options

The following patterns are considered warnings:

a::pseudo {}

a::PSEUDO {}

a::element {}

The following patterns are not considered warnings:

a:before {}

a::before {}

::selection {}

input::-moz-placeholder {}

Given:

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

The following patterns are not considered warnings:

a::pseudo-element {}

a::my-pseudo {}

a::my-other-pseudo {}