Firefox only Node filter : NodeFilter « DOM Node « JavaScript Tutorial

<html>
<head>
<title>NodeIterator Example</title>
<script type="text/javascript">
   var iterator = null;

   function makeList() {
       var oDiv = document.getElementById("div1");
       var oFilter = new Object;
       oFilter.acceptNode = function (oNode) {
           return (oNode.tagName == "P") ? NodeFilter.FILTER_REJECT : NodeFilter.FILTER_ACCEPT;
       };

       iterator = document.createTreeWalker(oDiv, NodeFilter.SHOW_ELEMENT, oFilter, false);
       var oOutput = document.getElementById("text1");
       var oNode = iterator.nextNode();

       while (oNode) {
           oOutput.value += oNode.tagName + "\n";
           oNode = iterator.nextNode();
       }

   }

</script>
</head>
<body>
<P>A<strong>B</strong> C <code>D</code>F<code>G</code>H</p>
<div id="div1">
    <P>Hello <b>World!</b></p>
    <ul>
        <li>List item 1</li>
        <li>List item 2</li>
        <li>List item 3</li>
    </ul>
</div>
<textarea rows="10" cols="40" id="text1"></textarea><br />
<input type="button" value="Make List" onclick="makeList()" />
</body>
</html>

Quote from:
Professional JavaScript for Web Developers
by Nicholas C. Zakas (Author)

# Paperback: 672 pages
# Publisher: Wrox (April 22, 2005)
# Language: English
# ISBN-10: 0764579088
# ISBN-13: 978-0764579080
23.15.NodeFilter
	23.15.1.	Firefox only Node filter