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GitHub Alerts & Admonitions0%
GitHub Alerts & Admonitions
Beginner12 min read•Updated: Jul 11, 2026
When writing documentation, software manuals, or installation guides, certain pieces of information require immediate visual distinction—such as a critical security warning, a helpful tip, or a breaking change alert. In late 2023, GitHub officially introduced standardized Markdown Alerts (Admonitions).
Click to Zoom1. The 5 Official GitHub Alert Types
GitHub alerts extend standard blockquote syntax by placing an alert identifier in square brackets ([!TYPE]) on the very first line:
> [!NOTE]
> Useful background information that users should know, even when skimming.
> [!TIP]
> Helpful advice, shortcuts, or performance recommendations for doing things better.
> [!IMPORTANT]
> Key information users need to know to achieve their goal and prevent errors.
> [!WARNING]
> Urgent info that needs user attention to avoid breaking changes or unexpected behavior.
> [!CAUTION]
> Advises about potential risks, destructive actions, or irreversible consequences (e.g. Data loss).
2. Visual Styling & Color Coding
Each alert type renders with a distinct theme, accent border, and leading SVG icon:
| Alert Syntax | Accent Color | Visual Theme & Icon | Typical Real-World Use Case |
|---|---|---|---|
> [!NOTE] | Blue | ℹ️ Information Circle | Explaining backward compatibility, historical context |
> [!TIP] | Green | 💡 Lightbulb | Keyboard shortcuts, performance optimizations |
> [!IMPORTANT] | Purple | ❗ Exclamation Diamond | Prerequisite software versions (e.g., Node.js 18+ required) |
> [!WARNING] | Amber/Orange | ⚠️ Warning Triangle | Deprecated API endpoints, migration deadlines |
> [!CAUTION] | Red | 🛑 Octagon Stop | rm -rf commands, dropping production databases |
3. Syntax Rules & Formatting Guidelines
To ensure alerts render properly across GitHub, GitLab, and modern SSGs:
- 1Uppercase Required: The alert keyword must be in all caps:
[!NOTE](not[!note]). - 2First Line Only: The
[!TYPE]token must appear on the very first line of the blockquote immediately following the>marker. - 3Multi-Line Body: Subsequent lines of text must also begin with a
>marker. - 4Rich Content: You can include bold text, inline code, and links inside an alert:
> [!WARNING]
> Running `npm run reset-db` will permanently erase all local tables.
> Please make sure you have created a backup before executing this command!
Interactive Quiz
Multiple Choice Questions
Question 1
What syntax is used on the first line of a blockquote to create an official GitHub Note alert?
Question 2
Which alert type renders with a green accent color and lightbulb icon for helpful shortcuts?
Question 3
Which alert level is recommended for warning users about irreversible data loss or destructive commands?
Question 4
Must the alert keyword inside '[!WARNING]' be written in uppercase?
Question 5
Can an alert contain inline code formatting such as '
npm install'?Next Lesson
Mermaid.js Diagrams in Markdown
Continue learning with hands-on practice, examples, and exercises in the upcoming topic.
Related Lessons
| Previous Lesson | Next Lesson |
|---|---|
| Footnotes & Citation References | Mermaid.js Diagrams in Markdown |
Practice Quiz
Test your understanding of this lesson with 5 questions. Each question has one correct answer.