Properly close DOM-created nodes. Fixes CNN.com election tracker, and 3 Acid3 tests (more like 3.5, actually --- gets one further).

It also makes Acid3 look uglier, since it exposes a bug in rendering of alternate content (it didn't show up before since the object was plain not getting loaded).

I know what's wrong just need to <strike>Bug dfaure for a solution</strike>figure out how to fix it.