Rendering

Rendering extensions project or decorate a parsed document without changing its stored Markdown. Use them to control generated structure, links, headings, and attributes.

Extensions

• Heading levels: project headings to different HTML levels.
• Content slicer: wrap heading sections in semantic elements.
• Permalinks: add stable links to headings.
• Contents: build a document outline.
• Default attributes: add controlled HTML attributes.
• Code titles: label fenced code blocks.
• External links: classify and mark outbound links.
• Link rewriting: transform destinations at render time.

These projections affect rendered output. toMarkdown() continues to preserve the source unless a separate edit or formatting operation changes it.