{
  "id": "page-has-main",
  "evaluate": "has-descendant-evaluate",
  "after": "has-descendant-after",
  "options": {
    "selector": "main:not([role]), [role='main']"
  },
  "metadata": {
    "impact": "moderate",
    "messages": {
      "pass": "Document has at least one main landmark",
      "fail": "Document does not have a main landmark"
    }
  }
}