Sequence: Nested Blocks With Notes
A loop nested in an alt branch, with notes inside the blocks: each block grows to hold its notes and the blocks nested in it, and nested header tabs stack instead of overlapping.
sequence-nested-blocks-with-notes.mmd
sequenceDiagram
participant A
participant B
alt cache hit
loop every retry
A->>B: fetch
Note right of B: waits for the upstream response
end
else cache miss
opt warm up
B->>B: rebuild
end
Note over A,B: done
end