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selector-type-no-unknown

Disallow unknown type selectors.

    unknown {}
/** ↑
 * This type selector */

This rule considers tags defined in the HTML, SVG, and MathML specifications to be known.

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

Options​

true​

The following patterns are considered problems:

unknown {}
tag {}

The following patterns are not considered problems:

input {}
ul li {}
li > a {}

Optional secondary options​

ignore: ["custom-elements", "default-namespace"]​

"custom-elements"​

Allow custom elements.

The following patterns are considered problems:

unknown {}
x-Foo {}

The following patterns are not considered problems:

x-foo {}

"default-namespace"​

Allow unknown type selectors if they belong to the default namespace.

The following patterns are considered problems:

namespace|unknown {}

The following patterns are not considered problems:

unknown {}

ignoreNamespaces: ["/regex/", /regex/, "string"]​

Given:

["/^my-/", "custom-namespace"]

The following patterns are not considered problems:

custom-namespace|unknown {}
my-namespace|unknown {}
my-other-namespace|unknown {}

ignoreTypes: ["/regex/", /regex/, "string"]​

Given:

["/^my-/", "custom-type"]

The following patterns are not considered problems:

custom-type {}
my-type {}
my-other-type {}