I would just do this on the server side. You can even do it statically when generating the XML. In fact until all the stuff about XSLT in browsers appeared recently, I didn't even know that browsers could do it.
Converting the contents of an Atom feed into (X)HTML means it's no longer a valid Atom feed. The same is true for many other document formats, such as flattened ODF.
Converting the contents of an Atom feed into (X)HTML means it's no longer a valid Atom feed. The same is true for many other document formats, such as flattened ODF.