What is needed to use the different icons? I can get it to work with icons like "alert" and "add", but if I use "edit" the icon isn't shown. Are there modules that need to be loaded for specific icons? I have loaded all that I could find: oojs-ui-core, oojs-ui-windows, oojs-ui-widgets, oojs-ui-toolbars.
Also, the "remove" icon used in the example doesn't seem to exist any more; it's not on the auto generated page.