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+<!DOCTYPE html>
+<html>
+<!--
+Test adapted from https://github.com/operasoftware/presto-testo/blob/master/core/standards/acid3/individual/006a.html
+-->
+<head>
+<title>TreeWalker: walking-outside-a-tree</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/assert-node.js"></script>
+<div id=log></div>
+</head>
+<body>
+<p>[Acid3 - Test 006a] walking outside a tree</p>
+<script>
+test(function () {
+    // test 6: walking outside a tree
+    var doc = document.createElement("div");
+    var head = document.createElement('head');
+    var title = document.createElement('title');
+    var body = document.createElement('body');
+    var p = document.createElement('p');
+    doc.appendChild(head);
+    head.appendChild(title);
+    doc.appendChild(body);
+    body.appendChild(p);
+
+    var w = document.createTreeWalker(body, 0xFFFFFFFF, null);
+    doc.removeChild(body);
+    assert_equals(w.lastChild(), p, "TreeWalker failed after removing the current node from the tree");
+    doc.appendChild(p);
+    assert_equals(w.previousNode(), title, "failed to handle regrafting correctly");
+    p.appendChild(body);
+    assert_equals(w.nextNode(), p, "couldn't retrace steps");
+    assert_equals(w.nextNode(), body, "couldn't step back into root");
+    assert_equals(w.previousNode(), null, "root didn't retake its rootish position");
+}, "walking outside a tree");
+</script>
+</body>
+</html>