The standard Nabble2 embedding code suggested by a forum's
Embedding Options page fails
http://validator.w3.org/ markup validation because
<script...>
lacks a
type="..."
attribute.
<a id="nabblelink" href="...">...</a>
<script src="http://n2.nabble.com/embed/..."></script>
A website maintainer can easily fix the issue by inserting the missing
type="..."
attribute, but it would nevertheless be a good idea for the sample code provided by
Embedding Options to present valid markup.