Nested Subgraphs (BT)

Subgraphs inside subgraphs under a bottom-to-top direction.

nested-subgraphs-bt.mmd
graph BT
  subgraph Outer
    subgraph Inner
      A --> B
    end
    B --> C
  end
  C --> D
Output
Flowchart, Zombie Mermaid Outer Inner A B C D

More Flowchart examples