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diff --git a/testing/web-platform/tests/dom/nodes/Node-compareDocumentPosition.html b/testing/web-platform/tests/dom/nodes/Node-compareDocumentPosition.html
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+++ b/testing/web-platform/tests/dom/nodes/Node-compareDocumentPosition.html
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+<!doctype html>
+<title>Node.compareDocumentPosition() tests</title>
+<link rel=author title="Aryeh Gregor" href=ayg@aryeh.name>
+<div id=log></div>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../common.js></script>
+<script>
+"use strict";
+
+testNodes.forEach(function(referenceName) {
+  var reference = eval(referenceName);
+  testNodes.forEach(function(otherName) {
+    var other = eval(otherName);
+    test(function() {
+      var result = reference.compareDocumentPosition(other);
+
+      // "If other and reference are the same object, return zero and
+      // terminate these steps."
+      if (other === reference) {
+        assert_equals(result, 0);
+        return;
+      }
+
+      // "If other and reference are not in the same tree, return the result of
+      // adding DOCUMENT_POSITION_DISCONNECTED,
+      // DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC, and either
+      // DOCUMENT_POSITION_PRECEDING or DOCUMENT_POSITION_FOLLOWING, with the
+      // constraint that this is to be consistent, together and terminate these
+      // steps."
+      if (furthestAncestor(reference) !== furthestAncestor(other)) {
+        // TODO: Test that it's consistent.
+        assert_in_array(result, [Node.DOCUMENT_POSITION_DISCONNECTED +
+                                 Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC +
+                                 Node.DOCUMENT_POSITION_PRECEDING,
+                                 Node.DOCUMENT_POSITION_DISCONNECTED +
+                                 Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC +
+                                 Node.DOCUMENT_POSITION_FOLLOWING]);
+        return;
+      }
+
+      // "If other is an ancestor of reference, return the result of
+      // adding DOCUMENT_POSITION_CONTAINS to DOCUMENT_POSITION_PRECEDING
+      // and terminate these steps."
+      var ancestor = reference.parentNode;
+      while (ancestor && ancestor !== other) {
+        ancestor = ancestor.parentNode;
+      }
+      if (ancestor === other) {
+        assert_equals(result, Node.DOCUMENT_POSITION_CONTAINS +
+                              Node.DOCUMENT_POSITION_PRECEDING);
+        return;
+      }
+
+      // "If other is a descendant of reference, return the result of adding
+      // DOCUMENT_POSITION_CONTAINED_BY to DOCUMENT_POSITION_FOLLOWING and
+      // terminate these steps."
+      ancestor = other.parentNode;
+      while (ancestor && ancestor !== reference) {
+        ancestor = ancestor.parentNode;
+      }
+      if (ancestor === reference) {
+        assert_equals(result, Node.DOCUMENT_POSITION_CONTAINED_BY +
+                              Node.DOCUMENT_POSITION_FOLLOWING);
+        return;
+      }
+
+      // "If other is preceding reference return DOCUMENT_POSITION_PRECEDING
+      // and terminate these steps."
+      var prev = previousNode(reference);
+      while (prev && prev !== other) {
+        prev = previousNode(prev);
+      }
+      if (prev === other) {
+        assert_equals(result, Node.DOCUMENT_POSITION_PRECEDING);
+        return;
+      }
+
+      // "Return DOCUMENT_POSITION_FOLLOWING."
+      assert_equals(result, Node.DOCUMENT_POSITION_FOLLOWING);
+    }, referenceName + ".compareDocumentPosition(" + otherName + ")");
+  });
+});
+
+testDiv.parentNode.removeChild(testDiv);
+</script>
+<!-- vim: set expandtab tabstop=2 shiftwidth=2: -->