CSS.getComputedStyleForNode

{
  "name": "getComputedStyleForNode",
  "parameters": [
    {
      "name": "nodeId",
      "$ref": "DOM.NodeId"
    }
  ],
  "returns": [
    {
      "items": {
        "$ref": "CSSComputedStyleProperty"
      },
      "type": "array",
      "name": "computedStyle",
      "description": "Computed style for the specified DOM node."
    }
  ],
  "description": "Returns the computed style for a DOM node identified by `nodeId`."
}