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HackMD collaborative markdown - slide presentations, embedded SVG diagrams, and real-time editing best practices
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Basado en la clasificación ocupacional SOC
| name | hackmd |
| description | HackMD collaborative markdown - slide presentations, embedded SVG diagrams, and real-time editing best practices |
| allowed-tools | Read, Grep, Glob, Bash |
HackMD is a collaborative markdown platform that supports real-time editing, slide presentations, and embedded content. This skill covers best practices for creating HackMD-compatible documents, particularly with embedded SVG diagrams.
HackMD supports presentation mode using --- separators between slides.
---
title: Presentation Title
tags: tag1, tag2
slideOptions:
theme: white # white, black, league, beige, sky, night, serif, simple, solarized
transition: slide # none, fade, slide, convex, concave, zoom
---
--- creates a new horizontal slide---- creates a vertical slide (nested under previous)S for speaker viewF for fullscreen<rect x="120" y="95" width="120" height="50" rx="8" fill="#4285f4"/>
<text x="180" y="115" text-anchor="middle" fill="white">Label</text>
<!-- This may not render correctly in HackMD -->
<g transform="translate(180, 120)">
<rect x="-60" y="-25" width="120" height="50"/>
</g>
<defs>
<marker id="arrowhead" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
<polygon points="0 0, 10 3.5, 0 7" fill="#666"/>
</marker>
</defs>
<!-- These will NOT render in HackMD -->
<defs>
<filter id="shadow">
<feDropShadow dx="2" dy="2" stdDeviation="3"/>
</filter>
</defs>
<rect filter="url(#shadow)"/> <!-- Won't work -->
When embedding multiple SVGs in one document, use unique IDs to avoid conflicts:
<!-- First SVG -->
<marker id="arrow-slide1" ...>
<!-- Second SVG -->
<marker id="arrow-slide2" ...>
<g opacity="0.3">
<rect .../>
<text .../>
</g>
<!-- Avoid -->
<style>
.highlight { fill: blue; }
</style>
<svg viewBox="0 0 800 400" xmlns="http://www.w3.org/2000/svg"
style="font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, sans-serif;">
<defs>
<marker id="arr" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
<polygon points="0 0, 10 3.5, 0 7" fill="#666"/>
</marker>
</defs>
<!-- Background -->
<rect x="0" y="0" width="800" height="400" fill="#f5f5f5"/>
<!-- Boxes with direct coordinates -->
<rect x="50" y="100" width="120" height="50" rx="8" fill="#4285f4" stroke="#1a73e8" stroke-width="2"/>
<text x="110" y="130" text-anchor="middle" fill="white" font-size="12" font-weight="bold">Box 1</text>
<!-- Arrows -->
<path d="M 170 125 L 250 125" fill="none" stroke="#666" stroke-width="1.5" marker-end="url(#arr)"/>
<!-- Dimmed elements -->
<g opacity="0.3">
<rect x="50" y="200" width="120" height="50" rx="8" fill="#4285f4"/>
<text x="110" y="230" text-anchor="middle" fill="white" font-size="12">Inactive</text>
</g>
</svg>
| Issue | Cause | Solution |
|---|---|---|
| Boxes don't appear | Using filter="url(#shadow)" | Remove all filter attributes |
| Raw XML showing | Unclosed tags or special characters | Validate XML, escape & as & |
| Elements misaligned | Using transform="translate()" | Use direct x, y coordinates |
| Arrows missing | ID conflicts between SVGs | Use unique IDs per SVG |
| Text cut off | ViewBox too small | Adjust viewBox dimensions |
| Feature | Supported | Notes |
|---|---|---|
| Basic shapes (rect, circle, path) | ✅ | |
| Text elements | ✅ | |
| Fill and stroke | ✅ | |
| Opacity | ✅ | |
| Markers (arrows) | ✅ | Keep simple |
| Gradients | ⚠️ | May work, test first |
| Filters (shadow, blur) | ❌ | Not supported |
| ClipPath | ⚠️ | Limited support |
| Animations | ❌ | Not supported |
| External fonts | ❌ | Use system fonts |
For simpler diagrams, HackMD natively supports Mermaid:
```mermaid
flowchart LR
A[Start] --> B[Process]
B --> C[End]
```
When to use Mermaid vs SVG:
From HackMD you can export to: