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Quick answers
When should I pick Mermaid text diagrams?
When the story is: process docs, onboarding, assignment logic, PR explanations.
When should I avoid Mermaid text diagrams?
Skip it in cases like: pixel-perfect brand illustrations that need freehand layout.
Who invented or popularised it?
Mermaid (2014) popularized Markdown-native diagrams on GitHub
What does it encode?
textual graph syntax rendered to SVG boxes and edges
Is it OK in ads?
Yes if one claim is visible at a glance in Meta, Google and retail print; otherwise link to a full figure.
Will a teacher accept it?
Yes for lab reports and poster boards if axes, units and a source line are present.
Mermaid text diagrams encodes values as textual graph syntax rendered to SVG boxes and edges. Mermaid (2014) popularized Markdown-native diagrams on GitHub.
In reports, ads and assignments it fits process docs, onboarding, assignment logic, PR explanations. Skip it when pixel-perfect brand illustrations that need freehand layout.
Mistakes
- Failure modes 1 — pixel-perfect brand illustrations that need freehand layout
- Failure modes 2 — 3-D pies and perspective bars
- Failure modes 3 — Dual axes that fake a correlation
- Failure modes 4 — Truncated axes that shout a small delta
- Failure modes 5 — Legend only, no direct labels
- Failure modes 6 — Missing source, unit or period
Fixes
- Fixes 1 — Return to process docs, onboarding, assignment logic, PR explanations.
- Fixes 2 — Flat, one axis, direct labels.
- Fixes 3 — Color-blind-safe palette plus pattern.
- Fixes 4 — Rewrite the title as a claim and add a source line.
Mermaid text diagrams: honour textual graph syntax rendered to SVG boxes and edges, and switch when pixel-perfect brand illustrations that need freehand layout.