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Markdown Extensions

Admonitions, content tabs, code annotations, and diagrams - on top of standard Markdown.

Markdown Extensions

Standard Markdown covers headings, lists, links, and code fences. On top of that, bx-sites turns on a handful of extensions - some by default, a couple opt-in - that get you a lot further before you'd ever reach for a content block (next lesson).

Admonitions

A callout box, on by default:

!!! tip "Heads up"
    This is an admonition. Its content is regular Markdown.

Twelve types are built in (note, warning, danger, success, and more), each with its own color. Prefix with ??? instead of !!! for a collapsible version.

Content tabs

Group alternative content - different languages, different platforms - behind clickable tabs:

=== "macOS"
    `brew install ...`

=== "Windows"
    Download the installer.

You've already seen this exact syntax in lesson 2's platform-specific install commands.

Code block annotations

Fenced code already syntax-highlights automatically; add linenums, hl_lines, or title to a fence's info string for line numbers, a highlighted range, or a small title bar - every example in this course uses title.

Diagrams and math

Opt in via bxsites.yaml: mermaid: true renders fenced ```mermaid blocks as live flowcharts/sequence diagrams; math: true typesets $...$/$$...$$ with KaTeX.

Footnotes and definition lists

Both off by default, both one config flag away (markdown.enableFootnotes/enableDefinitionLists) - reference-style footnotes and Term\n: Definition lists, respectively.

Full syntax and every config flag: Markdown Extensions.