Markdown features

Zeku’s live preview renders standard markdown and a set of popular extensions. What your site renders depends on its Markdown settings, so check the table below before you rely on an extension.

Astro 7 renders less by default

Since Astro 7, sites render Markdown with Sätteri by default, with no plugins. Math, callouts, ::: blocks, wikilinks, and highlights show in Zeku either way, but they appear on your site only if it turns them on or adds a plugin for them. A site built from a theme often already has them.

Standard markdown

These render on every Astro site:

• Headings, paragraphs, bold, italic, inline code, and strikethrough
• Links and images
• Ordered, unordered, and task lists
• Block quotes and horizontal rules
• Tables
• Fenced code blocks, highlighted by language
• Footnotes
• Raw HTML, including forms

Extensions

Feature	Write it as	Needs on your site
Callouts	> [!note] on a quote’s first line	A callout plugin, or a theme that has one
Admonitions	:::note … :::	Starlight, or directive support
Math	$x^2$ inline, $$ for a block	Math support, such as KaTeX
Mermaid diagrams	A ```mermaid code block	A Mermaid integration
Highlights	==text==	A highlight plugin
Wikilinks and embeds	[[post]] and ![[image.png]]	A wikilink plugin
Video, audio, and social embeds	, , or an embed code block with a URL	A theme or plugin that embeds them

Callouts fold like Obsidian’s: add - or + after the type, as in > [!tip]-, to start one closed or open.

Only the ![](url) form embeds. A plain link or a bare URL stays a link, as in Obsidian.