Document.getElementsByClassName-null-undef.html

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This WPT test may be referenced by the following Test IDs:
- /html/dom/documents/dom-tree-accessors/Document.getElementsByClassName-null-undef.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>getElementsByClassName and null/undefined</title>

<link rel="author" title="Ms2ger" href="mailto:ms2ger@gmail.com">

<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-getelementsbyclassname">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<div id="test">

<p id="p1"></p>

<p class="undefined" id="p2"></p>

<p class="null" id="p3"></p>

<p class="undefined null" id="p4"></p>

</div>

<script>

test(function() {

  var wrapper = document.getElementById("test");

  assert_equals(document.getElementsByClassName(undefined).length, 2);

  assert_equals(document.getElementsByClassName(undefined)[0],

    document.getElementById("p2"));

  assert_equals(document.getElementsByClassName(undefined)[1],

    document.getElementById("p4"));

/*

  assert_equals(document.getElementsByClassName(null).length, 2);

  assert_equals(document.getElementsByClassName(null)[0],

    document.getElementById("p3"));

  assert_equals(document.getElementsByClassName(null)[1],

    document.getElementById("p4"));

*/

});

</script>