Accessibility.AXRelatedNode

{
  "id": "AXRelatedNode",
  "type": "object",
  "properties": [
    {
      "name": "backendDOMNodeId",
      "$ref": "DOM.BackendNodeId",
      "description": "The BackendNodeId of the related DOM node."
    },
    {
      "name": "idref",
      "type": "string",
      "description": "The IDRef value provided, if any.",
      "optional": true
    },
    {
      "name": "text",
      "type": "string",
      "description": "The text alternative of this node in the current context.",
      "optional": true
    }
  ]
}