Some plugins have been written to try to work around this problem, by
whitelisting the html needed to embed things from a few sites like Google
-calendar, videos, and YouTube. The problem with these plugins is that they
-have to be kept up to date to add new sites, and follow changes to the html
-such sites use for embedding.
+maps, calendar, videos, and YouTube. The problem with these plugins is that
+they have to be kept up to date to add new sites, and follow changes to the
+html such sites use for embedding.
(Digression: The real problem with the plugins is that they hide the
underlying trust relationship. If you decide to embed html from a site,