Link

alternate

Points to another representation of the current page, such as a translation, feed, or version made for different media.

Code examples

<link rel="alternate" hreflang="en-US" href="https://example.com/en-us/">

Identifies the US English version with a valid language tag.

<link rel="alternate" hreflang="en_US" href="https://example.com/en-us/">

Uses an underscore, so en_US is not a valid BCP 47 language tag. Use en-US.

01
Use valid language tags
For translated pages, set hreflang to a valid BCP 47 language tag such as en-US. Each URL should also identify itself and the other language versions.
02
Describe the alternate
Use hreflang for language variants, type for feeds, or media for versions designed for particular media conditions.