code: func (remote *RemoteDebugger) GetOuterHTML(nodeID int) (string, error) {
  	res, err := remote.SendRequest("DOM.getOuterHTML", Params{
  		"nodeId": nodeID,
  	})
  
  	if err != nil {
  		return "", err
  	}
  
  	return res["outerHTML"].(string), nil
  }
docs: // GetOuterHTML returns node's HTML markup.