Renders Markdown with an in-house parser: ATX and setext headings with ids, paragraphs, emphasis, strikethrough, inline code, fenced and indented code blocks, blockquotes, nested and ordered lists, task lists, GFM tables with alignment, links with titles, images, autolinks and horizontal rules. Raw HTML is escaped and link targets are limited to http(s), mailto, tel, relative and anchor URLs, so the rendered preview is safe. Export the HTML fragment or a complete styled document; the secondary pane shows word count, reading time and a table of contents. Everything runs locally.