def __init__(self, *,
doctype: str = 'html',
default_class: type = HTMLElement,
**kwargs: Any) -> None:
"""Create new Document node.
:arg str doctype: Document type of this document.
:arg type default_class: Default class created by
:py:meth:`createElement` method.
"""
super().__init__()
self.__window = Window(self)
self._default_class = default_class
self.__doctype = DocumentType(doctype, parent=self)
self.__html = Html(parent=self)
self.__head = Head(parent=self.documentElement)
self.__body = Body(parent=self.documentElement)
