Writing

Frontmatter - a YAML block at the top of a page shows as a table at the page's end, under Metadata, so the page opens on its content. A markdown link in a value, parent: "[plan](plan.md)", works as a link in the page does: it opens its target, lists the page under Linked from there, and health reports it when it breaks.

A page ending with its frontmatter under Metadata, as a two-column table of keys and values, a list as bullets and a map as rows of its own

Includes - {include: parts/intro.md} is replaced by that file's text, so one page can be assembled from several and updates when any of them is saved. {include: design.md#retry-policy} brings in one section, and #^<id> copied from a block's ¶ brings in one block. Includes work anywhere, code and diagrams included; one that finds nothing stays as written, marked red. Write \{include: path} to show the text instead.

Loose tables - rows with too many or too few cells, and pipe lines with no divider line, still render as tables.

Math, diagrams and maps - $...$ inline and $$...$$ on a line of its own render as formulas. A ```geojson or ```topojson fence draws as a map of its shapes, offline until you press Load map for OpenStreetMap's tiles, and an ```stl fence as a 3D model you turn by dragging. A diagram that cannot be drawn shows its source with a red bar; point at it to read the error.

A page drawing the stations and the track between them as a map, its tiles not yet loaded, and a rain gauge's funnel as a 3D model