I did have to use invoke as `box` was not a class ...

# getting-started

[Ruckus]

I did have to use invoke as box was not a class but an arbitrary delegate property in a class (of which the user could create their own). So the user could use val box by cssclass(). They can also create things other than classes (IDs, pseudo classes, custom elements) or even use arbitrary strings ".label > .box" { ... }.