A lot of examples are broken:
Tested in FF, Opera.
Caused by: java.lang.NullPointerException: css is null
at Unknown.Ve(Unknown Source)
at Unknown.Ye(Unknown Source)
at Unknown.dpg(Unknown Source)
at Unknown.dub(Unknown Source)
P.S. May be it makes sense to deploy the demo with extra information, so when something happens it will show at least source filenames and line numbe instead of (Unknown Source).
<set-property name="compiler.emulatedStack" value="true"/>
<set-configuration-property name="compiler.emulatedStack.recordFileNames" value="true"/>