Class: Direction BT
`direction BT` stacks the classes bottom to top (#2116): the parent sits at the bottom, a lollipop name hangs below its host and a note keeps its class. The boxes stay upright in both panels.
class-direction-bt.mmd
classDiagram
direction BT
class Shape {
<<abstract>>
+area() double
}
Shape <|-- Circle
Shape <|-- Square
Shape ()-- Drawable
note for Square "all sides equal"