Fix CSS cannot select number ID issue

todo.md

@@ -2,3 +2,29 @@
 - git graph requires a blank line at the end. why?
 - Create a desktop client
 - Flowchart `interpolate` is useless because there is no rendering code using it
+
+
+I have the feeling that the flowchart DSL is not very readable or expressive despite it is short.
+And it is too limited for complicated requirements such as: https://github.com/knsv/mermaid/issues/592
+
+Maybe the following is better:
+
+```json
+{
+  "nodes": [
+    {
+      "name": "A"
+    }
+    {
+      "name": "B"
+    }
+  ],
+  "edges": [
+    {
+      "from": "A",
+      "to": "B",
+      "style": "dashed"
+    }
+  ]
+}
+```