Click on the arrows, text is broken up into multiple lines.
The document creates TR and TD elements in the null namespace. See bug 8007.
This is a problem not just with this site, but with Prototype.js in general.
Created attachment 18901 [details] proposed fix
Comment on attachment 18901 [details] proposed fix r=me
Committed revision 30013.
Mass moving XML DOM bugs to the "DOM" Component.