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lang-style

If set, the lang tag must have a valid form (xx-YY, where xx is a valid language code and YY is a valid country code). If the value is equal to "case", the tag must be capitalized conventionally (with the language code lowercase and the country code uppercase).

Given:

{
  "rules": {
    "lang-style": "error"
  }
}

The following patterns are considered violations:

<html lang="" >
<html lang="fr" >

The following patterns are not considered violations:

<html lang="FR" >