hreflang="sc"

sc is a valid hreflang value for Sardinian.

Language: Sardinian (sc, ISO 639-1)

Example

<link rel="alternate" hreflang="sc" href="https://example.com/sc/" />

The code is case-insensitive for Google. The conventional spelling is a lowercase language, a title-case script and an uppercase region: sc.

Without a region, the annotation targets every Sardinian speaker regardless of country. Regional versions sit next to the language-only version in one cluster.