A Symfony bundle providing markdown_block and markdown_inline Twig filters, as well as a rich text editor for editing Markdown content.
The Markdown processor allows arbitrary HTML, so the output is sanitised using HTML Purifier.
CommonMark extensions provide support for superscript and subscript.
The rich text editor uses third-party libraries for conversion between Markdown and HTML (in both directions). To update these, edit bower.json if necessary, then run bower update. Commit the updated files to this repository then create a new release.