INamedNodeMap
NamedNodeNap is a key/value pair of nodes that can be accessed by
numeric or string index.
https://dom.spec.whatwg.org/#interface-namednodemap
Gets the node at the specified numeric index.
Gets the node with the specified name.
Gets the number of nodes in the NamedNodeMap.
Gets a named item in the NamedNodeMap.
Gets a named item in the NamedNodeMap identified by namespace and
local name.
Removes a named item from the NamedNodeMap
Removes a named item from the NamedNodeMap.
Sets a named item in the NamedNodeMap.
Sets a named item in the NamedNodeMap.