code: func (c *DOM) RequestChildNodes(nodeId int, depth int, pierce bool) (*gcdmessage.ChromeResponse, error) {
  	var v DOMRequestChildNodesParams
  	v.NodeId = nodeId
  	v.Depth = depth
  	v.Pierce = pierce
  	return c.RequestChildNodesWithParams(&v)
  }
docs: // RequestChildNodes - Requests that children of the node with given id are returned to the caller in form of `setChildNodes` events where not only immediate children are retrieved, but all children down to the specified depth.
  // nodeId - Id of the node to get children for.
  // depth - The maximum depth at which children should be retrieved, defaults to 1. Use -1 for the entire subtree or provide an integer larger than 0.
  // pierce - Whether or not iframes and shadow roots should be traversed when returning the sub-tree (default is false).