getElementsByClassName is defined in HTML5. From WhatWG:
<script type="text/javascript">
<!–
if (top.location.href != self.location.href) top.location.href = self.location.href;
–>
</script>
<!–
if (top.location.href != self.location.href) top.location.href = self.location.href;
–>
</script>
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