Error · valid-lang
Invalid language on part of the page
Lighthouse / axe call it: lang attribute must have a valid value · [lang] attributes do not have a valid value
A section declares a language code that doesn't exist.
Who it leaves out: blind people (screen readers)
How to fix it
Use a valid code. Code included.
In the code
Use a valid BCP 47 code in the lang attribute of this element, e.g. lang="fr".
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Related errors
Automated testing covers roughly half of WCAG criteria; a full conformance claim also requires manual review. Technical information, not legal advice.