TreeWalker
The TreeWalker object represents the nodes of a document subtree and a position within them.
Properties
The TreeWalker.currentNode property represents the A Node.
The TreeWalker.filter read-only property returns the NodeFilter associated with the TreeWalker.
The TreeWalker.whatToShow read-only property returns a bitmask that indicates the types of nodes to show.
Functions
The TreeWalker.firstChild() method moves the current the found child.
The TreeWalker.nextSibling() method moves the current is no such node, it returns null and the current node is not changed.
The TreeWalker.parentNode() method moves the current and returns the found node.
The TreeWalker.previousNode() method moves the current returns the found node.
The TreeWalker.previousSibling() method moves the current there is no such node, it returns null and the current node is not changed.