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Test Info:

<!doctype html>
<html class="a">
<head>
<title>element.getElementsByClassName(): adding an element</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body class="a">
<div id="log"></div>
<script>test(function() {
var collection = document.body.getElementsByClassName("a");
var ele = document.createElement("x-y-z");
ele.className = "a";
document.body.appendChild(ele);
assert_array_equals(collection, [ele]);
})
</script>
</body>
</html>