Element-siblingElement-null-xhtml.xhtml
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Null Test</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<h1>Test of previousElementSibling and nextElementSibling returning null</h1>
<div id="log"></div>
<p id="parentEl">The result of this test is <span id="first_element_child" style="font-weight:bold;">unknown.</span></p>
<script><![CDATA[
test(function() {
var fec = document.getElementById("first_element_child");
assert_equals(fec.previousElementSibling, null)
assert_equals(fec.nextElementSibling, null)
})
]]></script>
</body>
</html>