h first, pre-order traversal, which is equivalent to the order in which the start tags occur in the text representation of the document). 
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In DOMs which support the Traversal feature, <code><a class="el" href="classDOMDocumentTraversal.html" title="DOMDocumentTraversal contains methods that create DOMNodeIterators and DOMTreeWalkers...">DOMDocumentTraversal</a></code> will be implemented by the same objects that implement the <a class="el" href="classDOMDocument.html" title="The DOMDocument interface re