CSS.getMatchedStylesForNode

{
  "name": "getMatchedStylesForNode",
  "parameters": [
    {
      "name": "nodeId",
      "$ref": "DOM.NodeId"
    },
    {
      "name": "includePseudo",
      "type": "boolean",
      "optional": true,
      "description": "Whether to include pseudo styles (default: true)."
    },
    {
      "name": "includeInherited",
      "type": "boolean",
      "optional": true,
      "description": "Whether to include inherited styles (default: true)."
    }
  ],
  "returns": [
    {
      "name": "matchedCSSRules",
      "type": "array",
      "items": {
        "$ref": "RuleMatch"
      },
      "optional": true,
      "description": "CSS rules matching this node, from all applicable stylesheets."
    },
    {
      "name": "pseudoElements",
      "type": "array",
      "items": {
        "$ref": "PseudoIdMatches"
      },
      "optional": true,
      "description": "Pseudo style matches for this node."
    },
    {
      "name": "inherited",
      "type": "array",
      "items": {
        "$ref": "InheritedStyleEntry"
      },
      "optional": true,
      "description": "A chain of inherited styles (from the immediate node parent up to the DOM tree root)."
    }
  ],
  "description": "Returns requested styles for a DOM node identified by nodeId."
}