Fix "Invalid page language code" in HTML
Why it's a problem
The lang attribute on <html> tells screen readers which voice and pronunciation rules to use. A code that does not exist (“en-ENG”, “english”, a typo) is as good as none: the text may be read with another language's pronunciation.
How to fix it — HTML
Use a valid language code: “en”, optionally followed by a region (“en-GB”, “en-US”). Also check the code matches the content's language, especially on a multilingual site.
<html lang="french"><html lang="fr">
<!-- ou avec la région : -->
<html lang="fr-FR">Check your site in 30 seconds
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