Markdown gets linting, math, image paste, and HTML export

June 20, 2026

The Markdown experience got a wide round of improvements.

More CommonMark extensions in the preview: YAML front matter (as a metadata block), footnotes, heading anchors, and ++inserted++ text, on top of the existing GFM tables, task lists, strikethrough, and autolinks.
Heading outline: the Structure tool window now shows a document’s #…###### tree (ATX and Setext), so long documents are navigable. Click a heading to jump.
Markdown linting: high-confidence rules (trailing whitespace, blank-line runs, heading-marker spacing, multiple H1, fenced blocks without a language, missing final newline, broken reference links) show as inline squiggles with hover messages and in a new Markdown Lint tool window. On by default; toggle with View: Toggle Markdown Lint.
Image paste and drag-drop: paste an image from the clipboard, or drop image files onto a saved Markdown buffer, and the file is written into a sibling assets/ folder with the ![](…) link inserted.
Smart link paste: paste a URL over a selection to wrap it as [selection](url).
Table editing: Tab and Shift-Tab move between cells, and Enter on the last row adds one, reflowing the table as you go.
LaTeX math: render inline $…$ and display $$…$$ math in the preview (and in PDF export) via JLaTeXMath, with GitHub-style delimiter rules so prose dollar amounts are left alone. Off by default (Settings → Editor → Render LaTeX math).
Export to HTML: export the rendered preview to a standalone, self-contained .html file (embedded stylesheet, heading anchors, math as images) via Preview: Export to HTML.

See the Markdown guide for the full picture.