{
  "id": "aria-labelledby",
  "evaluate": "aria-labelledby-evaluate",
  "metadata": {
    "impact": "serious",
    "messages": {
      "pass": "aria-labelledby attribute exists and references elements that are visible to screen readers",
      "fail": "aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty",
      "incomplete": "ensure aria-labelledby references an existing element"
    }
  }
}