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Website Quality Alert

Unknown content language specification


The code of the content language defined for the web page is unknown.

The list of known language codes includes the ISO 639-1 and ISO 639-2 codes. The Internet Assigned Numbers Authority (IANA) provides the official language subtag registry.


According to the W3C Internationalization Best Practices, language information is useful for things such as authoring tools, translation tools, accessibility, font selection, page rendering, search, and scripting. In practice, we see that localized search engines (such as google.it) make use of language information, so that missing or incorrect information may have a negative impact of search engine ranking. It is also likely to affect site visitors who use screen readers or spell checkers, in case an input from the user is expected.


Always specify the content language with the correct language code, preferably using the ISO 639 codes.

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