axe-core/lib/checks/language/xml-lang-mismatch.json

Accessibility engine for automated Web UI testing

{
  "id": "xml-lang-mismatch",
  "evaluate": "xml-lang-mismatch-evaluate",
  "metadata": {
    "impact": "moderate",
    "messages": {
      "pass": "Lang and xml:lang attributes have the same base language",
      "fail": "Lang and xml:lang attributes do not have the same base language"
    }
  }
}