- 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
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