Features

These features are illustrated in our Demo.

@prosemark/core

• Inline styles including italics, bold text, code spans, and strike-throughs. Highlights using the ==highlight== syntax are planned.

• Links ([label](url) and GFM autolinks). Hosts can override open behavior with the last-wins clickLinkHandler facet. Pointer placement over hidden marks uses visiblePosAtCoords (see Fold, Hide, & Theming).

• Both ATX Headings (# My Heading) and Setext Headings (headings over a line with ===== or -----) are supported.

• Unordered lists using - and ordered lists using 1. are supported. Ordered lists using + are not yet supported.

• Task lists following the - [ ] My Task syntax are supported.

• Images using the ![](https://image-url...) syntax are supported. Setting the image width via GitHub like syntax is planned.

• Block quotes (including nested block quotes) are supported.

• Fenced code blocks with language highlighting (via @codemirror/language-data or your own codeLanguages).

• Horizontal rules using the --- syntax are supported.

• YAML frontmatter blocks at the top of a document (--- … ---) are supported and parsed as YAML.

@prosemark/render-html

• HTML Blocks inside markdown can be rendered. HTML content is sanitized using DOMPurify.

• Paragraphs that contain only HTML tags (for example a lone <span> or <a>) are folded with the same block widget; mixed prose with inline HTML tags is not widgetized yet.

• Folded HTML blocks use block replace widgets: an outer shell avoids vertical margins (padding only), and an inner flow-root wrapper contains margins from rendered elements (for example headings) so CodeMirror’s line layout stays accurate. requestMeasure runs after updates and when the widget resizes (ResizeObserver where available).

• Links inside HTML widgets open through the shared clickLinkHandler facet (pointer and keyboard); non-link clicks still place the editor cursor.

@prosemark/paste-rich-text

• Makes it possible to paste rich text as fully-formatted markdown.

• Pastes HTML anchors whose visible text equals the href as a bare URL (instead of [url](url)), so GFM autolink rendering can apply.

• Provides the Ctrl/Cmd+Shift+V command for pasting without formatting.

@prosemark/spellcheck-frontend

• Does not include a dictionary or spelling engine; you compute SpellcheckIssue ranges (for example with nspell or a remote API) and expose them through the spellcheckIssues facet.

• Renders wavy underlines for misspelled ranges and keeps decorations mapped across document edits so ranges stay valid.

• Shows a tooltip on interaction (including keyboard shortcuts from spellcheckKeymap): suggestions from the issue and/or from an async suggestionFetcher facet, plus custom actions via spellcheckActions (for example “add to word list”).

@prosemark/latex

• Dollar-delimited math ($...$ / $$...$$) is parsed as Math nodes when mathMarkdownSyntaxExtension is enabled (included in prosemarkMarkdownSyntaxExtensions). latexMathMarkdownSyntaxExtension is a re-export of that extension. Add latexMathNestedHighlightExtension from @prosemark/latex for nested TeX (stexMath) highlighting inside MathFormula.

• Rendered with MathJax via latexMarkdownEditorExtensions() and latexMarkdownSyntaxTheme.

• Block vs inline: $$...$$ is always block; $ ... $ with inner padding is block; tight $...$ is inline.

• See the LaTeX math guide for MathJax loading and setup.