GitHub Flavored Markdown: Task Lists, Alerts, Footnotes, and Mermaid
Use GitHub Flavored Markdown features: task lists, @mentions, alerts, footnotes, collapsed sections, and Mermaid diagram embedding.
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Tags: markdown, github, documentation
GitHub Flavored Markdown: Task Lists, Alerts, Footnotes, and Mermaid GitHub Flavored Markdown (GFM) is a strict superset of CommonMark. GitHub published the GFM spec in 2017 to formalize the extensions GitHub had been rendering for years. Most of those extensions are now supported across GitLab, VS Code, Obsidian, and many static site generators — making GFM essentially the de facto extended Markdown standard for developers. This guide covers the GFM-specific features that go beyond CommonMark and shows where each one is (and isn't) supported. Alerts (GitHub-Specific Callouts) GitHub introduced a blockquote-based alert syntax in 2023. These render as colored callout boxes with an icon and label: The five alert types map to a visual design language: NOTE and TIP are informational…
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