### Question:
Node implements Cloneable { public Node root() { Node node = this; while (node.parentNode != null) node = node.parentNode; return node; } protected  Node(); abstract String nodeName(); boolean hasParent(); String attr(String attributeKey); abstract Attributes attributes(); Node attr(String attributeKey, String attributeValue); boolean hasAttr(String attributeKey); Node removeAttr(String attributeKey); Node clearAttributes(); abstract String baseUri(); void setBaseUri(final String baseUri); String absUrl(String attributeKey); Node childNode(int index); List<Node> childNodes(); List<Node> childNodesCopy(); abstract int childNodeSize(); Node parent(); final Node parentNode(); Node root(); Document ownerDocument(); void remove(); Node before(String html); Node before(Node node); Node after(String html); Node after(Node node); Node wrap(String html); Node unwrap(); void replaceWith(Node in); List<Node> siblingNodes(); Node nextSibling(); Node previousSibling(); int siblingIndex(); Node traverse(NodeVisitor nodeVisitor); String outerHtml(); T html(T appendable); String toString(); @Override boolean equals(Object o); boolean hasSameValue(Object o); @Override Node clone();  }### Answer:
@Test public void root() { Document doc = Jsoup.parse("<div><p>Hello"); Element p = doc.select("p").first(); Node root = p.root(); assertTrue(doc == root); assertNull(root.parent()); assertTrue(doc.root() == doc); assertTrue(doc.root() == doc.ownerDocument()); Element standAlone = new Element(Tag.valueOf("p"), ""); assertTrue(standAlone.parent() == null); assertTrue(standAlone.root() == standAlone); assertTrue(standAlone.ownerDocument() == null); }