The ownerDocument of Node for JS returns the node document. Returns null for documents.
node.ownerDocument
baseURI
childNodes
cloneNode
compareDocumentPosition
contains
firstChild
getRootNode
hasChildNodes
isConnected
isEqualNode
lastChild
nextSibling
nodeName
nodeType
normalize
parentElement
parentNode
previousSibling
Web Hypertext Application Technology Working Group (WHATWG)
