function getEventTargetDocument(eventTarget) {
  return eventTarget.window === eventTarget ? eventTarget.document : eventTarget.nodeType === DOCUMENT_NODE ? eventTarget : eventTarget.ownerDocument;
}
function getEventTargetDocument(eventTarget) {
  return eventTarget.window === eventTarget ? eventTarget.document : eventTarget.nodeType === DOCUMENT_NODE ? eventTarget : eventTarget.ownerDocument;
}
function getEventTargetDocument ( eventTarget ) { return eventTarget . window === eventTarget ? eventTarget . document : eventTarget . nodeType === DOCUMENT_NODE ? eventTarget : eventTarget . ownerDocument ; }
Get document associated with the event target.

@param {object} nativeEventTarget
@return {Document}
Get document associated with the event target .