exp/template/html: add some tests for ">" attributes.
exp/template/html: add some tests for ">" attributes.

R=mikesamuel
CC=golang-dev
http://codereview.appspot.com/4956042
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go