<!doctype html>
<html class="a">
<head>
<title>document.getElementsByClassName(): changing classes</title>
<script src="resources/common.js"></script>
</head>
<body class="a">
<p id="r">FAIL (script did not run)</p>
<script>
var collection = document.getElementsByClassName("a")
document.body.className += "\tb"
t(collection, [document.documentElement, document.body])
</script>
</body>
</html>