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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-form-element/form-elements-nameditem-01.html 

<!DOCTYPE html>
<title>form.elements: namedItem</title>
<link rel="author" title="Ms2ger" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-form-elements">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<div id="test">
<form id=form>
<input name=b id=i1>
<input name=b id=i2>
</form>
</div>
<script>
test(function() {
  assert_true("RadioNodeList" in window, "RadioNodeList should exist");
}, "RadioNodeList should exist")
test(function() {
  var nl = document.forms.form.elements["b"];
  assert_true(nl instanceof NodeList, "Should get a NodeList");
  if ("RadioNodeList" in window) {
    assert_true(nl instanceof RadioNodeList, "Should get a RadioNodeList");
  }
  assert_array_equals(nl,
                      [document.getElementById("i1"),
                       document.getElementById("i2")]);

  var el = nl[0];
  el.parentNode.removeChild(el);
  assert_true(nl instanceof NodeList, "Should get a NodeList");
  if ("RadioNodeList" in window) {
    assert_true(nl instanceof RadioNodeList, "Should get a RadioNodeList");
  }
  assert_array_equals(nl, [document.getElementById("i2")]);
  assert_equals(document.forms.form.elements["b"], document.getElementById("i2"));
}, "elements collection should return elements or RadioNodeLists")
test(function() {
  var fs = document.forms.form.appendChild(document.createElement("fieldset"));
  fs.name = "fs";
  assert_equals(document.forms.form.elements.fs, fs);
  fs.parentNode.removeChild(fs);
}, "elements collection should include fieldsets")
</script>