# CSS Custom Properties: Using CSS-wide keywords

`initial` as a value for an unregistered custom property
`inherit` as a value for an unregistered custom property
`unset` as a value for an unregistered custom property
`revert` as a value for an unregistered custom property
`revert-layer` as a value for an unregistered custom property
`initial` as a value for a non-inheriting registered custom property
`initial` as a value for an inheriting registered custom property
`inherit` as a value for a non-inheriting registered custom property
`inherit` as a value for an inheriting registered custom property
`unset` as a value for a non-inheriting registered custom property
`unset` as a value for an inheriting registered custom property
`revert` as a value for a non-inheriting registered custom property
`revert` as a value for an inheriting registered custom property
`revert-layer` as a value for a non-inheriting registered custom property
`revert-layer` as a value for an inheriting registered custom property
`initial` as a `var()` fallback for an unregistered custom property
`inherit` as a `var()` fallback for an unregistered custom property
`unset` as a `var()` fallback for an unregistered custom property
`revert` as a `var()` fallback for an unregistered custom property
`revert-layer` as a `var()` fallback for an unregistered custom property
`initial` as a `var()` fallback for a non-inheriting registered custom property
`initial` as a `var()` fallback for an inheriting registered custom property
`inherit` as a `var()` fallback for a non-inheriting registered custom property
`inherit` as a `var()` fallback for an inheriting registered custom property
`unset` as a `var()` fallback for a non-inheriting registered custom property
`unset` as a `var()` fallback for an inheriting registered custom property
`revert` as a `var()` fallback for a non-inheriting registered custom property
`revert` as a `var()` fallback for an inheriting registered custom property
`revert-layer` as a `var()` fallback for a non-inheriting registered custom property
`revert-layer` as a `var()` fallback for an inheriting registered custom property