- Copy button in the top-right of fenced code blocks, with execCommand
fallback when the Clipboard API is unavailable over plain HTTP
- Mod-A inside a code block selects the block content first; pressing
it again selects the whole document
- Paint code block backgrounds on a ::before layer below CodeMirror's
selection layer so selections inside code blocks are visible
- Table toolbar sits in reserved space above the table instead of
overlapping it, with grouped icon buttons
- Top-level GFM tables render as an editable widget: click a cell to
edit its Markdown source, Tab/Enter/arrows to navigate, toolbar to
insert/delete rows and columns or switch to source
- Structural table edits are isolated undo steps; focus is restored
after the widget is rebuilt
- Clicking an image moves the cursor to its syntax to reveal the source
- Renderer escapes raw HTML and filters dangerous URL schemes by default
- 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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