{
  "id": "valid-lang",
  "selector": "[lang], [xml\\:lang]",
  "matches": "not-html-matches",
  "tags": ["cat.language", "wcag2aa", "wcag312"],
  "metadata": {
    "description": "Ensures lang attributes have valid values",
    "help": "lang attribute must have a valid value"
  },
  "all": [],
  "any": [],
  "none": ["valid-lang"]
}