<!doctype html>
<html class="a">
<head>
<title>element.getElementsByClassName(): adding an element</title>
<script src="resources/common.js"></script>
</head>
<body class="a">
<p id="r">FAIL (script did not run)</p>
<script>
var collection = document.body.getElementsByClassName("a"),
ele = document.createElement("x-y-z")
ele.className = "a"
document.body.appendChild(ele)
t(collection, [ele])
</script>
</body>
</html>