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Using Diagrams
Fenced code blocks with the mermaid language identifier render as diagrams.
No plugins or build steps are required. mermaid.js loads once per page and replaces each block with an SVG after page load.
Flowchart
md
```mermaid
flowchart LR
A[Request hits Bark] --> B{Page in cache?}
B -->|Yes| C[Serve cached HTML]
B -->|No| D[404]
C --> E[Compute ETag]
E --> F[Return response]
```flowchart LR
A[Request hits Bark] --> B{Page in cache?}
B -->|Yes| C[Serve cached HTML]
B -->|No| D[404]
C --> E[Compute ETag]
E --> F[Return response]
Sequence diagram
sequenceDiagram
participant Browser
participant Bark
participant Watcher as FileSystemWatcher
Browser->>Bark: GET /guide/diagrams
Bark->>Browser: 200 OK (cached HTML)
Note over Watcher: docs/diagrams.md saved
Watcher->>Bark: change event (debounced 300ms)
Bark->>Bark: rebuild page cache
Browser->>Bark: poll /api/build-version
Bark->>Browser: new version
Browser->>Browser: location.reload()
Class diagram
Data model example:
classDiagram
class DocumentationPage {
+string Path
+string Title
+string HtmlContent
+DateTime LastModified
+string Layout
}
class NavEntry {
+string Title
+string Path
+bool Collapsed
+NavEntry[] Items
}
DocumentationPage "1" --> "0..*" NavEntry : appears in
State diagram
stateDiagram-v2
[*] --> Idle
Idle --> Rebuilding: file changed
Rebuilding --> Idle: content unchanged (hash match)
Rebuilding --> Reloading: content changed
Reloading --> Idle: browser reloaded
Pie chart
pie title Search ranking weight
"Title" : 10
"Description" : 5
"Heading" : 3
"Body text" : 1
Diagrams render client-side. They are absent from the HTML source, from text-only crawlers, and from llms.txt. Content essential to understanding must also appear in the surrounding text, which also provides a text alternative for assistive technology.
Note
Diagram colors come from the active theme palette. Mermaid bakes colors into the SVG instead of using CSS variables, so toggling dark mode on a page with diagrams triggers a full reload.