hreflang="eo"

eo is a valid hreflang value for Esperanto.

Language: Esperanto (eo, ISO 639-1)

Example

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

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

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