For reference, those variables are defined at the end of the script tag in javascript.vm --> https://github.com/xwiki/xwiki-platform/blob/3cb03574d599595b4950a90b1c437bb78705be3f/xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-resources/src/main/resources/flamingo/javascript.vm#L241-L244
