I have just uploaded an updated patch that will make the web UI for MM 2.1.6 XHTML 1.0 strict compliant. This patch allows for some CSS formatting as well.
I have tried to make all the pages compliant, but I may have missed some combinations of pages and options, so if you find some that aren't compliant, please let me know which page isn't compliant and under which circumstances it's not.
It it patch 1160353 in the Sourceforge Mailman patch repository. http://sourceforge.net/tracker/index.php?func=detail&aid=1160353&gro... _id=103&atid=300103
If anyone has any feedback on it, I'd love to hear it,since this is my first attempt at creating a patch.