Memory.getDOMCounters

{
  "name": "getDOMCounters",
  "returns": [
    {
      "name": "documents",
      "type": "integer"
    },
    {
      "name": "nodes",
      "type": "integer"
    },
    {
      "name": "jsEventListeners",
      "type": "integer"
    }
  ]
}