I opened a bug up for this and Ken is going to take a look at it for next year.
What I am asking for is the icon0 through icon19 images start with an image set to an icon. When you do that the icon-color property shows up in design mode. I am also asking for icon-color to be initially set using the rgb function so students know how to set it.
I am also asking for the removal of the icon-size property.
The issue is further complicated by computing the ID of the elements. Bug - unit 5 lesson 8