The lang attribute must have a valid value on all elements

readable/valid-lang · WCAG 3.1.2 · Level AA

The lang attribute must have a valid value on all elements.

When content in a different language appears within a page (e.g., a French quote in an English document), wrap it with a lang attribute to ensure correct pronunciation. The lang value must be a valid BCP 47 tag. Common codes: en, es, fr, de, zh, ja, pt, ar, ru.

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Introduced in @accesslint/core v0.8.0