Multiple Slots
Certain elements have multiple different slots where different sets of children can be displayed.
For example, the Tab element has both a header and a body.
To populate one of the secondary slots, use the %ui:slotName { ... } syntax:
Tab($fireball) {
%ui:header { // Populates the header slot of `Tab`
"Fireball"
}
P { "Launch a ferocious ball of fire that engulfs your enemies" }
}