prep

docs/.playground/mermaidtest.md

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+```mermaid
+flowchart LR
+    subgraph m[Mermaid.js]
+    direction TB
+        S[ ]-.-
+        C[build<br>diagrams<br>with markdown] -->
+        D[on-line<br>live editor]
+    end
+    A[Why are diagrams<br>useful?] --> m
+    m --> N[3 x methods<br>for creating<br>diagrams]
+    N --> T[Examples]
+    T --> X[Styling<br>and<br>captions]
+    X --> V[Tips]
+
+
+    classDef box fill:#fff,stroke:#000,stroke-width:1px,color:#000;
+    classDef spacewhite fill:#ffffff,stroke:#fff,stroke-width:0px,color:#000
+    class A,C,D,N,X,m,T,V box
+    class S spacewhite
+```
+