code: func (c *DOM) QuerySelector(nodeId int, selector string) (int, error) {
  	var v DOMQuerySelectorParams
  	v.NodeId = nodeId
  	v.Selector = selector
  	return c.QuerySelectorWithParams(&v)
  }
docs: // QuerySelector - Executes `querySelector` on a given node.
  // nodeId - Id of the node to query upon.
  // selector - Selector string.
  // Returns -  nodeId - Query selector result.