Plugin Tag: alternate
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Juiz Lang Attribute
Add a custom HREFLANG meta box on your post to manually edit the link between your post and a translation (which could be outside your domain).
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Hreflang for polylang
Auto print in header the link alternate hreflang of all the language in the website.
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SEV Simple hreflang
Adds hreflang alternates for pages, posts, and categories and outputs them correctly in the page head — including a self-referencing link.