mode for editing Markdown-formatted text files in GNU Emacs

 The mode provides syntax highlighting, and keyboard shortcuts for editing,
 compiling, and previewing Markdown. It has general support for various
 markdown flavours, supports Markdown 1.0 and CommonMark, and includes a
 special GFM (Github Flavoured Markdown) major mode.
 .
 Out of the box, markdown-mode will use markdown, discount, or
 libtext-markdown-perl for HTML preview and export by calling
 /usr/bin/markdown. Please note that they produce slightly different
 results (eg: apostrophes exported as " ' " vs " ’ "), and they may
 handle digressions from the CommonMark specification in different
 ways—for example in what is identified as a sublist rather than a
 subsequent list item.
 .
 If "defcustom markdown-command" is customised it can also be made to
 work with pandoc, libtext-multimarkdown-perl, or python3-markdown.
 Using pandoc will also unlock various other configuration options.
 See README.md and customize-mode for details.