Node : http://www.w3schools.com/js/js_htmldom_nodes.asp
The Node object represents a single node in the document tree. A node can be an element node, an attribute node, a text node, or any other of the node types explained in the Node Types chapter.
Element : http://www.w3schools.com/js/js_htmldom_elements.asp
The Element object represents an element in an XML document. Elements may contain attributes, other elements, or text. If an element contains text, the text is represented in a text-node.
duplicate :