hreflang="rm"

rm is a valid hreflang value for Romansh.

Language: Romansh (rm, ISO 639-1)

Example

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

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

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