Pattern: Unknown value for property within declaration
Issue: -
Disallows unknown values for properties within declarations.
This rule considers values for properties defined within the CSS specifications to be known. You can use the propertiesSyntax and typesSyntax secondary options to extend the syntax.
This rule is only appropriate for CSS. You should not turn it on for CSS-like languages, such as Sass or Less, as they have their own syntaxes.
The following patterns are considered violations:
a { top: red; }a { top: unknown; }The following patterns are not considered violations:
a { top: 0; }a { top: var(--foo); }