<!DOCTYPE HTML> <meta charset=utf-8> <title>firstElementChild</title> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <h1>Test of firstElementChild</h1> <div id="log"></div> <p id="parentEl">The result of this test is <span id="first_element_child" style="font-weight:bold;">logged above.</span></p> <script> test(function() { var parentEl = document.getElementById("parentEl"); var fec = parentEl.firstElementChild; assert_true(!!fec) assert_equals(fec.nodeType, 1) assert_equals(fec.getAttribute("id"), "first_element_child") }) </script>