hreflang="bo"

bo is a valid hreflang value for Tibetan.

Language: Tibetan (bo, ISO 639-1)

Example

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

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

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