Guide
GitHub, GitLab, and Markdown Mermaid Compatibility
Test the fenced source in the actual repository host and keep an exported fallback when compatibility matters.
This technical source review checks guide claims against current standards, official documentation, and the behavior of DevPouch tools. It is not an independent security audit.
Related tools
Practical recommendation
Mermaid support is a host feature layered on top of Markdown. The host selects its renderer version, themes, security policy, and supported diagram types.
Keep source conservative for shared repositories. Test a pull-request preview and provide a sanitized SVG or PNG fallback when documents must render in several systems.
Working example
```mermaid
flowchart LR
Source[Markdown source] --> Host{Host supports syntax?}
Host -- Yes --> Render[Diagram]
Host -- No --> Fallback[Linked SVG or PNG]
```Review checklist
- The fenced language is `mermaid`.
- Syntax renders in the exact GitHub/GitLab version used.
- Dark and light repository themes remain readable.
- A fallback is available for exported or offline Markdown.
Compatibility, security, and limitations
- A source that renders in DevPouch may use syntax newer than a host.
- Repository sanitizers may remove links or styling.
- Markdown PDF pipelines often need a pre-render step.
Treat Mermaid as a host runtime
The fenced Markdown syntax only requests Mermaid rendering. The host decides the bundled library version, enabled diagram types, theme variables, link behavior, sanitization, and export pipeline. Test in a pull-request or merge-request preview on the exact host used by readers.
Prefer conservative syntax when one document must render in several systems. Keep a sanitized SVG or PNG fallback and the source, but avoid embedding both in a way that shows duplicate diagrams on supported hosts.
Compatibility record
- Repository host and observed date/version.
- Diagram types and syntax features exercised.
- Light and dark theme screenshots using synthetic content.
- PDF/static-site/export behavior.
- Fallback location and regeneration instructions.
- Security restrictions that intentionally differ from local preview.
References
FAQ
How should I verify the examples in GitHub, GitLab, and Markdown Mermaid Compatibility?
Load the synthetic example into the linked DevPouch tool, confirm the visible result, then verify syntax and behavior in the exact platform that will consume it.
Can the generated result replace technical review?
No. Rendering and validation catch mechanical issues; meaning, accessibility, security, and contract accuracy still require human review.