Can I use rel="alternate" language tags on multiple domains?

[Ewerton.RD]

On a page with the domain "www.example-1.com.br" (for pt-BR) I will include the following tags:

That will work?

[dMaLasp]

Hi,

You have to include a reference to the page itself.

You can also use the hreflang tags along with self-referencing canonicals.

Regards,

[Ewerton.RD]

But if the Portuguese version already has ? Do I need to point it too?

[dMaLasp]

Yes, you still need to include it, hreflang has nothing to do with html lang, in fact google ignores the html lang tags https://www.seroundtable.com/google-ignores-the-html-lang-attribute-22974.html

[Ewerton.RD]

Great, thanks!