- CodeMirror 6 editor with Obsidian/Typora-style live preview: block
markup revealed per line, inline markup revealed per element
- Fenced code highlighting via Shiki (github-dark, JS regex engine) in a
Web Worker, languages loaded on demand
- Lezer syntax tree to HTML renderer for share pages, checked against
the CommonMark 0.31.2 spec (640/652; 12 known parser deviations)
- Use markdownLanguage directly to avoid bundling lang-html/css/js
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