Multilingual sites usually break in a boring way. Someone adds a new language page, links it from the English version, and forgets that the new page must link back. Search engines treat hreflang annotations as valid only when they are reciprocal, so a missing return link quietly cancels the sig...

Source: [Dev.to](https://dev.to/pandawm/a-40-line-python-script-to-check-hreflang-reciprocity-on-a-small-site-1hnh)

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