Given a basic HTML document...
<HTML>
    <HEAD>
        <TITLE>Example basic HTML document</TITLE>
    </HEAD>
    <BODY BGCOLOR=#FFFFFF>
        <B>Hello, World!</B>
    </BODY>
</HTML>
You can Access a given 'jump node' like so..

<?php
    $tidy = tidy_parse_file("myhtmldoc.html");
    
    $root = $tidy->root();
    $html = $tidy->html();
    $head = $tidy->head();
    $body = $tidy->body();
?>