Factorio Forums

The entity-preview widget can be created, but doesn't display anything at all (not even an empty box or anything like that). Example commands to reproduce: Passing the entity in the parameters when creating the widget doesn't work either (unless the key for that isn't "entity").

After some discussion, the problem turns out to actually be that the default height and width for the widget are 0. More here.

The default style is "empty-widget". Not sure if that is intentional or not, but it is the reason that it is necessary to set both width and height.